Apache HTTP Server

Happy Friday, everyone. Let's take a look at how the past week has progressed: ASF Board – management and oversight of the business affairs of the corporation in accordance with the Foundation's bylaws.- Next Board Meeting: 16 October ... [More] 2019. Board calendar and minutes http://apache.org/foundation/board/calendar.html ApacheCon™ – the ASF's official global conference series, bringing Tomorrow's Technology Today since 1998 - Countdown to ApacheCon Europe --REGISTER TODAY! https://www.apachecon.com/ - NEW! The latest presentations from ApacheCon/Las Vegas exclusively on Feathercast https://feathercast.apache.org/ ASF Infrastructure – our distributed team on three continents keeps the ASF's infrastructure running around the clock. - 7M+ weekly checks yield uptime at 99.95%. Performance checks across 50 different service components spread over more than 250 machines in data centers around the world. http://www.apache.org/uptime/ Apache Code Snapshot – this week, 825 Apache contributors changed 2,115,070 lines of code over 2,959 commits. Top 5 contributors, in order, are: Mark Robert Miller, Andrea Cosentino, Stephen Mallette, Mark Thomas, and Daniel Keir Haywood. Apache Project Announcements – the latest updates by category. Content -- - Apache Jackrabbit 2.14.8 and Oak 1.8.17, 1.10.5 released http://jackrabbit.apache.org Identity Management -- - Apache Syncope 2.0.14 and 2.1.5 released http://syncope.apache.org Libraries -- - Apache Commons Configuration 2.6 released https://commons.apache.org/proper/commons-configuration Web Frameworks --  - Apache Wicket 8.6.1 and 9.0.0-M3 released http://wicket.apache.org Did You Know?  - Did you know that the Open Source Design community (ApacheCon Europe Community Partners) are holding a FREE workshop on October 25th (immediately following ApacheCon)? Register today, as space is limited! https://aceu19.apachecon.com/open-source-design-workshop  - Did you know the four things "Father of Java" James Gosling loves about Apache? Learn more in "My personal journey to Open Source", James's keynote at ApacheCon North America https://s.apache.org/0q20b  - Did you know that the ASF exceeded 7,000 code Committers https://s.apache.org/w7bw1 Apache Community Notices:  - Celebrating 20 Years Community-led Development "The Apache Way" https://s.apache.org/ASF20thAnniversary  - ASF Founders look back on 20 Years of the ASF https://blogs.apache.org/foundation/entry/our-founders-look-back-on  - The Apache Way to Sustainable Open Source Success https://s.apache.org/GhnI  - Foundation Reports and Statements http://www.apache.org/foundation/reports.html  - ApacheCon: Tomorrow's Technology Today since 1998 http://s.apache.org/ApacheCon  - ASF Annual Report for FY2019 https://s.apache.org/FY2019AnnualReport  - The Apache Software Foundation 2018 Vision Statement https://s.apache.org/zqC3  - Foundation Statement –Apache Is Open. https://s.apache.org/PIRA  - "Success at Apache" focuses on the processes behind why the ASF "just works". https://blogs.apache.org/foundation/category/SuccessAtApache  - Please follow/like/re-tweet the ASF on social media:  @TheASF on Twitter (https://twitter.com/TheASF) and on LinkedIn at https://www.linkedin.com/company/the-apache-software-foundation  - Do friend and follow us on the Apache Community Facebook page https://www.facebook.com/ApacheSoftwareFoundation/and Twitter account https://twitter.com/ApacheCommunity  - The list of Apache project-related MeetUps can be found at http://events.apache.org/event/meetups.html  - Spark + AI Summit 2019 will be held 15-17 October in Amsterdam https://databricks.com/sparkaisummit/  - Registration open for ApacheCon Europe 22-24 October 2019 http://apachecon.com/  - Find out how you can participate with Apache community/projects/activities --opportunities open with Apache Camel, Apache HTTP Server, and more! https://helpwanted.apache.org/  - Are your software solutions Powered by Apache? Download & use our "Powered By" logos http://www.apache.org/foundation/press/kit/#poweredby = = = For real-time updates, sign up for Apache-related news by sending mail to [email protected] and follow @TheASF on Twitter. For a broader spectrum from the Apache community, https://twitter.com/PlanetApache provides an aggregate of Project activities as well as the personal blogs and tweets of select ASF Committers. [Less]

Happy Friday! We're wrapping up another great week with the following activities: ASF Board – management and oversight of the business affairs of the corporation in accordance with the Foundation's bylaws.- Next Board Meeting: 18 September ... [More] 2019. Board calendar and minutes http://apache.org/foundation/board/calendar.html ApacheCon™ – the ASF's official global conference series, bringing Tomorrow's Technology Today since 1998 - Countdown to ApacheCon Europe -- we look forward to seeing you in Berlin -- REGISTER TODAY! https://www.apachecon.com/ - NEW! Catch the latest presentations from ApacheCon/Las Vegas exclusively on Feathercast https://feathercast.apache.org/ ASF Infrastructure – our distributed team on three continents keeps the ASF's infrastructure running around the clock. - 7M+ weekly checks yield uptime at 100.00%. Performance checks across 50 different service components spread over more than 250 machines in data centers around the world. http://www.apache.org/uptime/ Apache Code Snapshot – this week, 857 Apache contributors changed 4,388,161 lines of code over 3,161 commits. Top 5 contributors, in order, are: Mark Thomas, Gary Gregory, Stephen Mallette, Andrea Cosentino, and Michael Stack. Apache Project Announcements – the latest updates by category. Big Data -- - Apache Calcite 1.21.0 released http://calcite.apache.org/ Build Management -- - Apache Maven 3.6.2 released http://maven.apache.org Content -- - Apache Traffic Control 3.0.2 released http://trafficcontrol.apache.org Data Management Platform -- - Apache Geode 1.9.1 released http://geode.apache.org Enterprise Processes Automation  - Apache OFBiz 16.11.06 released http://ofbiz.apache.org Libraries -- - Apache Flagon UserALE.js 2.0.2 (Incubating) released http://flagon.incubator.apache.org  - Apache HttpComponents Client 4.5.10 GA released http://hc.apache.org  - Apache Commons Daemon 1.2.1 released http://commons.apache.org  - Apache Milagro Crypto C & JS Libraries (Incubating) 1.0.0 released http://milagro.apache.org Messaging Platform -- - Apache Pulsar 2.4.1 released http://pulsar.apache.org Web Frameworks -- - Apache Wicket 7.15.0 and 8.6.0 released http://wicket.apache.org Did You Know?  - Did you know that Apple have been successfully using Apache CloudStack for the past 6 years to power their virtual machine service for hundreds of mission-critical internal and external applications? http://cloudstack.apache.org/  - Did you know that during this week's ApacheCon, Apache projects added 406 new committers, and Apache Calcite, Camel, Flink, Maven, SkyWalking, Syncope, Tapestry, and Wicket issued new releases? https://projects.apache.org/  -  Did you know that 35 new individual ASF Members elected, totaling 766 https://s.apache.org/w7bw1 Apache Community Notices:  - Celebrating 20 Years Community-led Development "The Apache Way" https://s.apache.org/ASF20thAnniversary  - ASF Founders look back on 20 Years of the ASF https://blogs.apache.org/foundation/entry/our-founders-look-back-on  - The Apache Way to Sustainable Open Source Success https://s.apache.org/GhnI  - Foundation Reports and Statements http://www.apache.org/foundation/reports.html  - ApacheCon: Tomorrow's Technology Today since 1998 http://s.apache.org/ApacheCon  - ASF Annual Report for FY2019 https://s.apache.org/FY2019AnnualReport  - The Apache Software Foundation 2018 Vision Statement https://s.apache.org/zqC3  - Foundation Statement –Apache Is Open. https://s.apache.org/PIRA  - "Success at Apache" focuses on the processes behind why the ASF "just works". https://blogs.apache.org/foundation/category/SuccessAtApache  - Please follow/like/re-tweet the ASF on social media:  @TheASF on Twitter (https://twitter.com/TheASF) and on LinkedIn at https://www.linkedin.com/company/the-apache-software-foundation  - Do friend and follow us on the Apache Community Facebook page https://www.facebook.com/ApacheSoftwareFoundation/and Twitter account https://twitter.com/ApacheCommunity  - The list of Apache project-related MeetUps can be found at http://events.apache.org/event/meetups.html  - Registration is open for ApacheCon North America 9-12 September 2019 http://apachecon.com/  - Spark + AI Summit 2019 will be held 15-17 October in Amsterdam https://databricks.com/sparkaisummit/  - Registration open for ApacheCon Europe 22-24 October 2019 http://apachecon.com/  - Find out how you can participate with Apache community/projects/activities --opportunities open with Apache Camel, Apache HTTP Server, and more! https://helpwanted.apache.org/  - Are your software solutions Powered by Apache? Download & use our "Powered By" logos http://www.apache.org/foundation/press/kit/#poweredby = = = For real-time updates, sign up for Apache-related news by sending mail to [email protected] and follow @TheASF on Twitter. For a broader spectrum from the Apache community, https://twitter.com/PlanetApache provides an aggregate of Project activities as well as the personal blogs and tweets of select ASF Committers. [Less]

An Apache NetBeans schedule for those going to Oracle Code One 2019 next week! Saturday, September 14 19:00 Hang out in the Thirsty Bear in Howard Street Monday, September 16 Why You Should Be Coding with the NetBeans IDE [BOF1321] Mark ... [More] Stephens, Developer, IDRsolutions Ethan Price, Developer, IDRsolutions 02:30 PM - 03:15 PM | Moscone South - Room 305 Java IDE Wars [DEV1375] Ken Fogel, Teacher, Dawson College Scott Selikoff, Software Developer, Selikoff Solutions, LLC Jeanne Boyarsky, Developer, CodeRanch 04:00 PM - 04:45 PM | Moscone South - Room 304 Hacking the NetBeans IDE [BOF1338] Mark Stephens, IDR Solutions 06:00 PM - 06:45 PM | Moscone South - Room 309 Hacking the NetBeans Profiler [BOF4170] Ryan Cuprak, Formulation Applications R&D Development Senior Manager, Dassault Systemes 06:00 PM - 06:45 PM | Moscone South - Room 305 Tuesday, September 17 Getting Started with Deep Learning for Enterprise Java Developers [DEV2126] Zoran Sevarac, Associate Professor, University of Belgrade, Faculty of Organisational Sciences Suyash Joshi, Developer Marketing Director, Oracle 12:30 PM - 01:15 PM | Moscone South - Room 308 Testing on Oracle Autonomous Database with Homomorphic Encryption, Using NetBeans and Java - BYOL [HOL3196] Simon Bain, Founder & CTO, ShieldIO 12:30 PM - 02:30 PM | Moscone West - Room 3024C Wednesday, September 18 Apache NetBeans: Its Status and Future [DEV2506] Geertjan Wielenga, Product Manager, Oracle Mark Stephens, Developer, IDRsolutions Ethan Price, Developer, IDRsolutions 06:00 PM - 06:45 PM | Moscone South - Room 206 Thursday, September 19 Testing on Oracle Autonomous Database with Homomorphic Encryption, Using NetBeans and Java - BYOL [HOL3196] Simon Bain, Founder & CTO, ShieldIO 09:00 AM - 11:00 AM | Moscone West - Room 3024C 19:00 Hang out in the Thirsty Bear in Howard Street [Less]

What happened On August 31st 2019, the machine hosting our subversion-to-git mirrors and synchronization process for GitHub suffered a catastrophic drive error due to a power failure at our data center in Virginia. The power failure was ... [More] , unfortunately, of such a nature, that recovering the disk data was not possible. Four days into the failure, on September 4th 2019, we received confirmation from the data center that the data redundancy had also failed, meaning we had no measure of restoring to a new disk. What this means right now Currently, all GitHub mirrors that originate in subversion, and thus relied on this service, are not being synchronized with their subversion source. As git relies on on-disk subversion meta-data, as opposed to in-repo, we are not able to obtain the meta-data and continue synchronizing unless a full recreation of the mirrors is performed. This means starting from the first revision in any given subversion repository and working towards the most current one, a process that may well take a few days or weeks, depending on the size of the repository (by number of commits) and the number of running jobs at that time. What we intend to do, going forward Our most immediate action has been to revisit off-site backup strategies to ensure that our services are as resilient as possible, as well as re-assess and re-categorize various machines with regards to backup strategies. With backups revisited, and on the more long-term side of things, discussions have been centered around what we want to offer, and how that will shape our design of the system. We want to balance the need for features against robustness and speed at the core of the service, as well as perform some fall cleaning of the service, and as such, the Infrastructure team has decided to restart the service with a blank slate, incorporating features as the needs arise and are discussed. We will also be reaching out to the projects with subversion-to-git mirrors currently on GitHub, and ask for a positive confirmation that they wish to continue with this service, so as to clean up the number of repositories that are no longer in use. We are also redesigning the core service, coupling it tighter with our subversion offerings. We estimate the git mirror service to be revamped and rebooted in a matter of weeks, as cycles allow (this is occurring in tandem with other service upgrades, which puts the timeline somewhat into the future), and will add mirror repositories on an ad-hoc basis as requests come in. Notable changes to service offering As we are starting with a blank slate, please be advised of the following changes to the service as it starts back up: There will no longer be a git.apache.org  URL for git mirrors, to lessen the confusion with gitbox.apache.org.  Projects wishing to point to a git copy of their subversion repository should use their respective GitHub URLs. Repositories are re-created from scratch. As such, it may take days from a recreation is started till the sync process begins to kick in. [Less]

by Toshihiro Suzuki, HBase Committer hbtop is a real-time monitoring tool for HBase modeled after Unix's _top_ command. It can display summary information as well as metrics per Region/Namespace/Table/RegionServer. With this tool, you can see ... [More] metrics sorted by a selected field and filter the metrics to see only metrics you are interested in. Also, with the drill-down feature, you dig in on hot-spotting Regions. hbtop (https://issues.apache.org/jira/browse/HBASE-11062) is available in the coming hbase 2.1.7, 2.2.2, and 2.3.0 releases and is being actively backported to branch-1. Run hbtop with the following command: $ hbase hbtop In this case, the values of hbase.client.zookeeper.quorum and zookeeper.znode.parent in hbase-site.xml in the classpath or their default values are used to connect. Or, specify your own zookeeper quorum and znode parent as follows: $ hbase hbtop -Dhbase.client.zookeeper.quorum= -Dzookeeper.znode.parent= Run hbtop and you'll see something like the following: The top screen consists of a summary and metrics section. In the summary section, you can see HBase Version, Cluster ID, The number of region servers, Region count, Average Cluster Load and Aggregated Request/s. In the metrics portion, you can see metrics per Region/Namespace/Table/RegionServer depending on the selected mode. The top screen is refreshed on a period – 3 seconds by default. You can scroll the metric records in the metrics section. Command line arguments Argument Description -d,--delay The refresh delay (in seconds); default is 3 seconds -h,--help Print usage; for help while the tool is running press h key -m,--mode The mode n (Namespace)|t (Table)|r (Region)|s (RegionServer), default is r (Region) Mode You can change mode by pressing the m key in the top screen. Change the refresh rate by pressing d key in the top screen. You can change the field screen by pressing f key in the top screen. In the fields screen, you can change the displayed fields by choosing a field and pressing d key or space key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the sort field by choosing a field and pressing s key. Also, you can change the sort order (ascending or descending) by pressing R key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the order of the fields. Filters You can filter the metric records with the filter feature. We can add filters by pressing o key for ignoring case or O key for case sensitive. The syntax is as follows: For example, we can add filters like the following: NAMESPACE==default REQ/S>1000 The operators you can specify are as follows: Operator Description = Partial match == Exact match > Greater than >= Greater than or equal to < Less than <= Less than and equal to You can see the current filters by pressing ^o key and clear them by pressing = key. Drilling down You can drill down on a metric record by pressing i key in the top screen. With this feature, you can find hot regions easily in a top-down manner. Help screen You can see the help screen by pressing h key in the top screen. How hbtop gets the metrics data hbtop gets the metrics from ClusterMetrics which is returned as the result of a call to Admin#getClusterMetrics() on the current HMaster. To add metrics to hbtop, they will need to be exposed via ClusterMetrics. Feedback, bugs, and enhancements are all welcome! The Reference Guide - hbtop: https://hbase.apache.org/book.html#hbtop [Less]

by Toshihiro Suzuki, HBase Committer hbtop is a real-time monitoring tool for HBase modeled after Unix's _top_ command. It can display summary information as well as metrics per Region/ Namespace/Table/RegionServer. With this tool, you ... [More] can see metrics sorted by a selected field and filter the metrics to see only metrics you are interested in. Also, with the drill-down feature, you dig in on hot-spotting Regions. hbtop (https://issues.apache.org/jira/browse/HBASE-11062) is available in the coming hbase 2.1.7, 2.2.2, and 2.3.0 releases and is being actively backported to branch-1. Run hbtop with the following command: $ hbase hbtop In this case, the values of hbase.client.zookeeper.quorum and zookeeper.znode.parent in hbase-site.xml in the classpath or their default values are used to connect. Or, specify your own zookeeper quorum and znode parent as follows: $ hbase hbtop -Dhbase.client.zookeeper. quorum= -Dzookeeper.znode.parent=  Run hbtop and you'll see something like the following: The top screen consists of a summary and metrics section. In the summary section, you can see HBase Version, Cluster ID, The number of region servers, Region count, Average Cluster Load and Aggregated Request/s. In the metrics portion, you can see metrics per Region/Namespace/Table/ RegionServer depending on the selected mode. The top screen is refreshed on a period – 3 seconds by default. You can scroll the metric records in the metrics section. Command line arguments a> Argument Description -d,--delay The refresh delay (in seconds); default is 3 seconds -h,--help Print usage; for help while the tool is running press h key -m,--mode The mode; n (Namespace)|t (Table)|r (Region)|s (RegionServer), default is r (Region) Modes You can change mode by pressing the m key in the top screen. Change the refresh rate by pressing d key in the top screen. You can change the field screen by pressing f key in the top screen. In the fields screen, you can change the displayed fields by choosing a field and pressing d key or space code> key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the sort field by choosing a field and pressing s. Also, you can change the sort order (ascending or descending) by pressing R key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the order of the fields. Filters You can filter the metric records with the filter feature. We can add filters by pressing o key for ignoring case or O key for case sensitive. The syntax is as follows: For example, we can add filters like the following: NAMESPACE==default REQ/S>1000 The operators you can specify are as follows: Operator Description = Partial match == Exact match > Greater than >= Greater than or equal to < Less than <= Less than and equal to You can see the current filters by pressing the ^o key and clear them by pressing the = key. Drilling down You can drill down on a metric record by pressing  i key in the top screen. With this feature, you can find hot regions easily in a top-down manner. Help screen You can see the help screen by pressing the h key in the top screen. How hbtop gets the metrics data hbtop gets the metrics from ClusterMetrics which is returned as the result of a call to Admin#getClusterMetrics() on the current HMaster. To add metrics to hbtop, they will need to be exposed via ClusterMetrics. hbtop sits in its own module with a README from where most of this blog post was cobbled. Feedback, bugs, and enhancements are all welcome!  [Less]

by Toshihiro Suzuki, HBase Committer hbtop is a real-time monitoring tool for HBase modeled after Unix's _top_ command. It can display summary information as well as metrics per Region/Namespace/Table/RegionServer. With this tool, you can see ... [More] metrics sorted by a selected field and filter the metrics to see only metrics you are interested in. Also, with the drill-down feature, you dig in on hot-spotting Regions. hbtop (https://issues.apache.org/jira/browse/HBASE-11062) is available in the coming hbase 2.1.7, 2.2.2, and 2.3.0 releases and is being actively backported to branch-1. Run hbtop with the following command: $ hbase hbtop In this case, the values of hbase.client.zookeeper.quorum and zookeeper.znode.parent in hbase-site.xml in the classpath or their default values are used to connect. Or, specify your own zookeeper quorum and znode parent as follows: $ hbase hbtop -Dhbase.client.zookeeper.quorum= -Dzookeeper.znode.parent= Run hbtop and you'll see something like the following: The top screen consists of a summary and metrics section. In the summary section, you can see HBase Version, Cluster ID, The number of region servers, Region count, Average Cluster Load and Aggregated Request/s. In the metrics portion, you can see metrics per Region/Namespace/Table/RegionServer depending on the selected mode. The top screen is refreshed on a period – 3 seconds by default. You can scroll the metric records in the metrics section. Command line arguments Argument Description -d,--delay The refresh delay (in seconds); default is 3 seconds -h,--help Print usage; for help while the tool is running press h key -m,--mode The mode n (Namespace)|t (Table)|r (Region)|s (RegionServer), default is r (Region) Mode You can change mode by pressing the m key in the top screen. Change the refresh rate by pressing d key in the top screen. You can change the field screen by pressing f key in the top screen. In the fields screen, you can change the displayed fields by choosing a field and pressing d key or space key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the sort field by choosing a field and pressing s key. Also, you can change the sort order (ascending or descending) by pressing R key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the order of the fields. Filters You can filter the metric records with the filter feature. We can add filters by pressing o key for ignoring case or O key for case sensitive. The syntax is as follows: For example, we can add filters like the following: NAMESPACE==default REQ/S>1000 The operators you can specify are as follows: Operator Description = Partial match == Exact match > Greater than >= Greater than or equal to < Less than <= Less than and equal to You can see the current filters by pressing ^o key and clear them by pressing = key. Drilling down You can drill down on a metric record by pressing i key in the top screen. With this feature, you can find hot regions easily in a top-down manner. Help screen You can see the help screen by pressing h key in the top screen. How hbtop gets the metrics data hbtop gets the metrics from ClusterMetrics which is returned as the result of a call to Admin#getClusterMetrics() on the current HMaster. To add metrics to hbtop, they will need to be exposed via ClusterMetrics. Feedback, bugs, and enhancements are all welcome! The Reference Guide - hbtop: https://hbase.apache.org/book.html#hbtop [Less]

by Toshihiro Suzuki, HBase Committer hbtop is a real-time monitoring tool for HBase modeled after Unix's _top_ command. It can display summary information as well as metrics per Region/ Namespace/Table/RegionServer. With this tool, you can ... [More] see metrics sorted by a selected field and filter the metrics to see only metrics you are interested in. Also, with the drill-down feature, you dig in on hot-spotting Regions. hbtop (https://issues.apache.org/jira/browse/HBASE-11062) is available in the coming hbase 2.1.7, 2.2.2, and 2.3.0 releases and is being actively backported to branch-1. Run hbtop with the following command: $ hbase hbtop In this case, the values of hbase.client.zookeeper.quorum and zookeeper.znode.parent in hbase-site.xml in the classpath or their default values are used to connect. Or, specify your own zookeeper quorum and znode parent as follows: $ hbase hbtop -Dhbase.client.zookeeper. quorum= -Dzookeeper.znode.parent=  Run hbtop and you'll see something like the following: The top screen consists of a summary and metrics section. In the summary section, you can see HBase Version, Cluster ID, The number of region servers, Region count, Average Cluster Load and Aggregated Request/s. In the metrics portion, you can see metrics per Region/Namespace/Table/ RegionServer depending on the selected mode. The top screen is refreshed on a period – 3 seconds by default. You can scroll the metric records in the metrics section. Command line arguments Argument Description -d,--delay The refresh delay (in seconds); default is 3 seconds -h,--help Print usage; for help while the tool is running press h key -m,--mode The mode; n (Namespace)|t (Table)|r (Region)|s (RegionServer), default is r (Region) Modes You can change mode by pressing the m key in the top screen. Change the refresh rate by pressing d key in the top screen. You can change the field screen by pressing f key in the top screen. In the fields screen, you can change the displayed fields by choosing a field and pressing d key or space key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the sort field by choosing a field and pressing s. Also, you can change the sort order (ascending or descending) by pressing R key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the order of the fields. Filters You can filter the metric records with the filter feature. We can add filters by pressing o key for ignoring case or O key for case sensitive. The syntax is as follows: For example, we can add filters like the following: NAMESPACE==default REQ/S>1000 The operators you can specify are as follows: Operator Description = Partial match == Exact match > Greater than >= Greater than or equal to < Less than <= Less than and equal to You can see the current filters by pressing the ^o key and clear them by pressing the = key. Drilling down You can drill down on a metric record by pressing  i key in the top screen. With this feature, you can find hot regions easily in a top-down manner. Help screen You can see the help screen by pressing the h key in the top screen. How hbtop gets the metrics data hbtop gets the metrics from ClusterMetrics which is returned as the result of a call to Admin#getClusterMetrics() on the current HMaster. To add metrics to hbtop, they will need to be exposed via ClusterMetrics. hbtop sits in its own module with a README from where most of this blog post was cobbled. Feedback, bugs, and enhancements are all welcome!  [Less]

by Toshihiro Suzuki, HBase Committer hbtop is a real-time monitoring tool for HBase modeled after Unix's _top_ command. It can display summary information as well as metrics per Region/Namespace/Table/RegionServer. With this tool, you can see ... [More] metrics sorted by a selected field and filter the metrics to see only metrics you are interested in. Also, with the drill-down feature, you dig in on hot-spotting Regions. hbtop (https://issues.apache.org/jira/browse/HBASE-11062) is available in the coming hbase 2.1.7, 2.2.2, and 2.3.0 releases and is being actively backported to branch-1. Run hbtop with the following command: $ hbase hbtop In this case, the values of hbase.client.zookeeper.quorum and zookeeper.znode.parent in hbase-site.xml in the classpath or their default values are used to connect. Or, specify your own zookeeper quorum and znode parent as follows: $ hbase hbtop -Dhbase.client.zookeeper.quorum= -Dzookeeper.znode.parent=  Run hbtop and you'll see something like the following: The top screen consists of a summary and metrics section. In the summary section, you can see HBase Version, Cluster ID, The number of region servers, Region count, Average Cluster Load and Aggregated Request/s. In the metrics portion, you can see metrics per Region/Namespace/Table/RegionServer depending on the selected mode. The top screen is refreshed on a period – 3 seconds by default. You can scroll the metric records in the metrics section. Command line arguments Argument Description -d,--delay The refresh delay (in seconds); default is 3 seconds -h,--help Print usage; for help while the tool is running press h key -m,--mode The mode; n (Namespace)|t (Table)|r (Region)|s (RegionServer), default is r (Region) Modes You can change mode by pressing the m key in the top screen. Change the refresh rate by pressing d key in the top screen. You can change the field screen by pressing f key in the top screen. In the fields screen, you can change the displayed fields by choosing a field and pressing d key or space key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the sort field by choosing a field and pressing s. Also, you can change the sort order (ascending or descending) by pressing R key. You can move to the fields screen by pressing f key in the top screen. In the field screen, you can change the order of the fields. Filters You can filter the metric records with the filter feature. We can add filters by pressing o key for ignoring case or O key for case sensitive. The syntax is as follows: For example, we can add filters like the following: NAMESPACE==default REQ/S>1000 The operators you can specify are as follows: Operator Description = Partial match == Exact match > Greater than >= Greater than or equal to < Less than <= Less than and equal to You can see the current filters by pressing the ^o key and clear them by pressing the = key. Drilling down You can drill down on a metric record by pressing i key in the top screen. With this feature, you can find hot regions easily in a top-down manner. Help screen You can see the help screen by pressing the h key in the top screen. How hbtop gets the metrics data hbtop gets the metrics from ClusterMetrics which is returned as the result of a call to Admin#getClusterMetrics() on the current HMaster. To add metrics to hbtop, they will need to be exposed via ClusterMetrics. hbtop sits in its own module with a README from where most of this blog post was cobbled. Feedback, bugs, and enhancements are all welcome!  [Less]

The Apache Maven team is pleased to announce the release of the Apache Maven 3.6.2. Apache Maven is a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project’s ... [More] build, reporting and documentation from a central piece of information. You can find out more about Apache Maven at https://maven.apache.org You can download the appropriate sources etc. from the download page We really value the contributions of these non committers, so this section is focused on those individuals. Descriptions of the issues fixed can be found at the end of these release notes. Issue Reporters of this release: Benoit GUERIN Christian Schulte Elliotte Rusty Harold Falko Modler Francesco Chicchiriccò Guillaume Nodet, guofei Joseph Walton Louis Mills Mark Derricutt, Mark McKelvy Mickael Istria Nicolas Echegut Nicolas Radde Raphael Rösch Ray Tsang Robert Thornton Rohan Padhye Sergey Chernov Stefan Oehme Thibaud Lepretre zhb. Code Contributors of this release: Guillaume Nodet Mickael Istria Ray Tsang Stefan Oehme Joseph Walton Bo Zhang AElMehdi Christian Schulte Mao Shuai MartinKanters Sergey Chernov Jesse Glick. Many thanks to all reporters and contributors for their time and support. (Please send an email to the dev list if we missed one to mention). Known Issues None. Overview about the changes This release focuses mostly performance improvements, better memory footprint, and less CPU usage. We are continuing to convert Maven Core to use JSR 330 annotations instead of Plexus (still not finished, see MNG-5577). New support for ‘release’ qualifier (see MNG-6655). The toolchain.xml file supports environment variables (see MNG-6665). User visible Changes toolchain.xml now supports usage of environment variables which looks like this: 1 2 3 4 5 6 7 8 9 10 jdk 1.8 sun ${env.JDK_HOME_8} The detailed issue list Bugs: MNG-6375 – NullPointerException when pom.xml has incomplete XML tag MNG-6626 – NullPointerException in DefaultExceptionHandler MNG-6629 – DefaultModelValidator.validateId is inefficient MNG-6630 – ComparableVersion.parseVersion is inefficient MNG-6631 – DefaultArtifactVersion.parseVersion is inefficient MNG-6632 – ArtifactHandlerManager.getArtifactHandler is inefficient MNG-6633 – ExcludesArtifactFilter is a memory hog MNG-6636 – NPE on reporting convertion (DefaultReportingConverter) when inheritance of with no reports MNG-6639 – Child inherit.append.path attributes not defined in Maven POM XSD MNG-6642 – Tycho-based modules do not build with 3.6.1 (works with 3.6.0) MNG-6643 – Version comparison CLI does not work anymore MNG-6644 – NPE in DefaultReportingConverter when reports has no InputLocation (using polyglot Maven) MNG-6647 – NPE in DefaultReportingConverter (when reports injected by Repaint IO maven-tiles) MNG-6653 – DefaultProjectBuildingRequest copy constructor does not copy all fields MNG-6668 – Model location handling uses too much memory MNG-6669 – Tycho cannot resolve project dependencies MNG-6700 – Equal compile source roots are added multiple times MNG-6703 – DefaultUrlNormalizer doesn’t normalize all relative URIs MNG-6704 – MavenRepositorySystemUtils.newSession() misses assignment MNG-6707 – Maven XML parser does not accept ‘>’ in XML processing instructions MNG-6712 – Downgrade maven-resolver:1.4.0 to 1.3.3 MNG-6713 – Fix ExclusionArtifactFilter to respect wildcard MNG-6716 – relative testSourceDirectory on macos throw duplicate class error MNG-6720 – MultiThreadedBuilder: wait for parallel running projects when using —fail-fast MNG-6723 – MavenProject.getParentFile() not set when using ProjectBuilder.build(List, …) Improvements MNG-6069 – Migrate to non deprecated parts of Commons CLI MNG-6638 – Prevent reparsing POMs in MavenMetadataSource MNG-6655 – Add support for “release” qualifier MNG-6665 – toolchain.xml file should support environment variables MNG-6667 – Hint at Maven upgrade requirement when trying to build a pom.xml with a newer modelVersion MNG-6675 – Make Resolver debug log messages for projects and plugins consistent MNG-6695 – Improve speed in collection merging MNG-6696 – Speed improvements while parsing big reactor projects MNG-6697 – Add a fast interpolator not using reflection MNG-6698 – Lazily compute the ManagedVersionMap MNG-6701 – Document maven.repo.local system property MNG-6702 – Improve DefaultModelValidator performance MNG-6705 – Speep up Artifact version check and Parent interpolation MNG-6718 – Upgrade Plexus Utils to 3.2.1 MNG-6729 – StringSearchModelInterpolator introspects objects from Java API MNG-6747 – Generalize ‘resume from’ message when build reactor fails Test MNG-6535 – Improve test coverage of org.apache.maven.model.path.DefaultUrlNormalizer Wish Task MNG-6681 – improve documentation: dependency type = file classifier(optional)+extension + additional hints on dependency features Dependency upgrade MNG-6549 – Remove unused transitive dependencies of Guava MNG-6627 – upgrade plexus-component-metadata to 2.0.0 to get reproducible META-INF/plexus/components.xml MNG-6646 – Upgrade maven-assembly-plugin to 3.1.1 MNG-6671 – Upgrade Modello to 1.11 MNG-6674 – Upgrade Wagon to 3.3.3 MNG-6738 – Upgrade maven-resolver to 1.4.1 Sub Tasks MNG-6680 – Convert Maven Settings Builder to JSR 330 MNG-6685 – Convert Maven Model Builder to JSR 330 MNG-6686 – Convert Maven Embedder to JSR 330 The full list of changes can be found in our issue management system. Complete Release Notes See complete release notes for all versions The Apache Maven Team. [Less]