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  1. Hadoop HDFS
  2. HDFS-8883

NameNode Metrics : Add FSNameSystem lock Queue Length

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.7.1
    • Fix Version/s: 2.8.0, 2.7.4, 3.0.0-alpha1
    • Component/s: namenode
    • Labels:
      None
    • Target Version/s:
    • Hadoop Flags:
      Reviewed

      Description

      FSNameSystemLock can have contention when NameNode is under load. This patch adds LockQueueLength – the number of threads waiting on FSNameSystemLock – as a metric in NameNode.

        Issue Links

          Activity

          Hide
          anu Anu Engineer added a comment -
          • Adds a metric that exposes the FSNameSystemLock Contention
          • Added tests to verify that lock contention will produce right metric
          • Added tests to verify that JMX exposes these counters
          Show
          anu Anu Engineer added a comment - Adds a metric that exposes the FSNameSystemLock Contention Added tests to verify that lock contention will produce right metric Added tests to verify that JMX exposes these counters
          Hide
          hadoopqa Hadoop QA added a comment -



          -1 overall



          Vote Subsystem Runtime Comment
          -1 pre-patch 19m 50s Findbugs (version ) appears to be broken on trunk.
          +1 @author 0m 0s The patch does not contain any @author tags.
          +1 tests included 0m 0s The patch appears to include 2 new or modified test files.
          +1 javac 7m 37s There were no new javac warning messages.
          +1 javadoc 9m 41s There were no new javadoc warning messages.
          +1 release audit 0m 22s The applied patch does not increase the total number of release audit warnings.
          +1 site 2m 57s Site still builds.
          +1 checkstyle 1m 38s There were no new checkstyle issues.
          +1 whitespace 0m 0s The patch has no lines that end in whitespace.
          +1 install 1m 31s mvn install still works.
          +1 eclipse:eclipse 0m 32s The patch built with eclipse:eclipse.
          +1 findbugs 4m 21s The patch does not introduce any new Findbugs (version 3.0.0) warnings.
          -1 common tests 22m 21s Tests failed in hadoop-common.
          -1 hdfs tests 176m 4s Tests failed in hadoop-hdfs.
              246m 58s  



          Reason Tests
          Failed unit tests hadoop.ha.TestZKFailoverController
            hadoop.net.TestNetUtils
            hadoop.hdfs.TestRollingUpgrade
          Timed out tests org.apache.hadoop.cli.TestHDFSCLI



          Subsystem Report/Notes
          Patch URL http://issues.apache.org/jira/secure/attachment/12749711/HDFS-8883.001.patch
          Optional Tests site javadoc javac unit findbugs checkstyle
          git revision trunk / 1c12adb
          hadoop-common test log https://builds.apache.org/job/PreCommit-HDFS-Build/11982/artifact/patchprocess/testrun_hadoop-common.txt
          hadoop-hdfs test log https://builds.apache.org/job/PreCommit-HDFS-Build/11982/artifact/patchprocess/testrun_hadoop-hdfs.txt
          Test Results https://builds.apache.org/job/PreCommit-HDFS-Build/11982/testReport/
          Java 1.7.0_55
          uname Linux asf909.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
          Console output https://builds.apache.org/job/PreCommit-HDFS-Build/11982/console

          This message was automatically generated.

          Show
          hadoopqa Hadoop QA added a comment - -1 overall Vote Subsystem Runtime Comment -1 pre-patch 19m 50s Findbugs (version ) appears to be broken on trunk. +1 @author 0m 0s The patch does not contain any @author tags. +1 tests included 0m 0s The patch appears to include 2 new or modified test files. +1 javac 7m 37s There were no new javac warning messages. +1 javadoc 9m 41s There were no new javadoc warning messages. +1 release audit 0m 22s The applied patch does not increase the total number of release audit warnings. +1 site 2m 57s Site still builds. +1 checkstyle 1m 38s There were no new checkstyle issues. +1 whitespace 0m 0s The patch has no lines that end in whitespace. +1 install 1m 31s mvn install still works. +1 eclipse:eclipse 0m 32s The patch built with eclipse:eclipse. +1 findbugs 4m 21s The patch does not introduce any new Findbugs (version 3.0.0) warnings. -1 common tests 22m 21s Tests failed in hadoop-common. -1 hdfs tests 176m 4s Tests failed in hadoop-hdfs.     246m 58s   Reason Tests Failed unit tests hadoop.ha.TestZKFailoverController   hadoop.net.TestNetUtils   hadoop.hdfs.TestRollingUpgrade Timed out tests org.apache.hadoop.cli.TestHDFSCLI Subsystem Report/Notes Patch URL http://issues.apache.org/jira/secure/attachment/12749711/HDFS-8883.001.patch Optional Tests site javadoc javac unit findbugs checkstyle git revision trunk / 1c12adb hadoop-common test log https://builds.apache.org/job/PreCommit-HDFS-Build/11982/artifact/patchprocess/testrun_hadoop-common.txt hadoop-hdfs test log https://builds.apache.org/job/PreCommit-HDFS-Build/11982/artifact/patchprocess/testrun_hadoop-hdfs.txt Test Results https://builds.apache.org/job/PreCommit-HDFS-Build/11982/testReport/ Java 1.7.0_55 uname Linux asf909.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Console output https://builds.apache.org/job/PreCommit-HDFS-Build/11982/console This message was automatically generated.
          Hide
          anu Anu Engineer added a comment -

          None of the test failures seem to be related to this patch. Re-running them on my local machine does succeed.

          Show
          anu Anu Engineer added a comment - None of the test failures seem to be related to this patch. Re-running them on my local machine does succeed.
          Hide
          xyao Xiaoyu Yao added a comment -

          Thanks Anu Engineer for working on this.
          Patch LGTM. +1.

          Show
          xyao Xiaoyu Yao added a comment - Thanks Anu Engineer for working on this. Patch LGTM. +1.
          Hide
          xyao Xiaoyu Yao added a comment -

          Thanks Anu Engineer for the contribution. I've committed the patch to trunk and branch-2.

          Show
          xyao Xiaoyu Yao added a comment - Thanks Anu Engineer for the contribution. I've committed the patch to trunk and branch-2.
          Hide
          hudson Hudson added a comment -

          SUCCESS: Integrated in Hadoop-trunk-Commit #8313 (See https://builds.apache.org/job/Hadoop-trunk-Commit/8313/)
          HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)

          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          • hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
          • hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          Show
          hudson Hudson added a comment - SUCCESS: Integrated in Hadoop-trunk-Commit #8313 (See https://builds.apache.org/job/Hadoop-trunk-Commit/8313/ ) HDFS-8883 . NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          Hide
          hudson Hudson added a comment -

          FAILURE: Integrated in Hadoop-Yarn-trunk #1021 (See https://builds.apache.org/job/Hadoop-Yarn-trunk/1021/)
          HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)

          • hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          • hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          Show
          hudson Hudson added a comment - FAILURE: Integrated in Hadoop-Yarn-trunk #1021 (See https://builds.apache.org/job/Hadoop-Yarn-trunk/1021/ ) HDFS-8883 . NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a) hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          Hide
          hudson Hudson added a comment -

          FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #291 (See https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/291/)
          HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)

          • hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
          • hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          Show
          hudson Hudson added a comment - FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #291 (See https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/291/ ) HDFS-8883 . NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a) hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          Hide
          hudson Hudson added a comment -

          FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #288 (See https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/288/)
          HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)

          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          • hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
          • hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          Show
          hudson Hudson added a comment - FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #288 (See https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/288/ ) HDFS-8883 . NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          Hide
          hudson Hudson added a comment -

          FAILURE: Integrated in Hadoop-Mapreduce-trunk #2237 (See https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2237/)
          HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)

          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
          • hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
          • hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          Show
          hudson Hudson added a comment - FAILURE: Integrated in Hadoop-Mapreduce-trunk #2237 (See https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2237/ ) HDFS-8883 . NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          Hide
          hudson Hudson added a comment -

          FAILURE: Integrated in Hadoop-Hdfs-trunk #2218 (See https://builds.apache.org/job/Hadoop-Hdfs-trunk/2218/)
          HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)

          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
          • hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          Show
          hudson Hudson added a comment - FAILURE: Integrated in Hadoop-Hdfs-trunk #2218 (See https://builds.apache.org/job/Hadoop-Hdfs-trunk/2218/ ) HDFS-8883 . NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a) hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          Hide
          hudson Hudson added a comment -

          FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #280 (See https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/280/)
          HDFS-8883. NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a)

          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
          • hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java
          • hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java
          • hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
          • hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          Show
          hudson Hudson added a comment - FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #280 (See https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/280/ ) HDFS-8883 . NameNode Metrics : Add FSNameSystem lock Queue Length. Contributed by Anu Engineer. (xyao: rev a7862d5fe4c505f5d4b0c675438a971733f1f53a) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
          Hide
          zhz Zhe Zhang added a comment -

          Thanks Anu Engineer for the work. This is a pretty good improvement. I just backported to branch-2.7.

          Show
          zhz Zhe Zhang added a comment - Thanks Anu Engineer for the work. This is a pretty good improvement. I just backported to branch-2.7.

            People

            • Assignee:
              anu Anu Engineer
              Reporter:
              anu Anu Engineer
            • Votes:
              0 Vote for this issue
              Watchers:
              8 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

                Development