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Posted to common-issues@hadoop.apache.org by "zhangshuyan0 (via GitHub)" <gi...@apache.org> on 2023/10/16 10:13:22 UTC

[PR] HDFS-17227. EC: Fix bug in choosing targets when racks is not enough. [hadoop]

zhangshuyan0 opened a new pull request, #6192:
URL: https://github.com/apache/hadoop/pull/6192

   ### Description of PR
   **Bug description**
   If,
   1. There is a striped block blockinfo1, which has an excess replica on datanodeA.
   2. blockinfo1 has an internal block that needs to be reconstruction.
   3. The number of racks is less than the number of internal blocks of blockinfo1.
   Then, NN may choose datanodeA to reconstruct the internal block, resulting in two internal blocks of blockinfo1 on datanodeA, causing confusion. 
   
   **Root cause and solution**
   When we use `BlockPlacementPolicyRackFaultTolerant` for choosing targets and the racks is insufficient, `chooseEvenlyFromRemainingRacks` will be called. Currently, `chooseEvenlyFromRemainingRacks` calls `chooseOnce`, `chooseOnce` use `newExcludeNodes` as parameter instead of `excludedNodes`. When we choose targets for reconstructing internal blocks, 'newExcludeNodes' only includes datanodes that contain live replicas, and does not include datanodes that have excess replicas. This may result in datanodes with excess replicas are chosen.
   https://github.com/apache/hadoop/blob/c8abca30045258668867eeab89fa05fe88fe5be6/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyRackFaultTolerant.java#L181-L189
   I think we do not need to use `newExcludeNodes`, just pass `excludedNodes` to `chooseOnce`.


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Re: [PR] HDFS-17227. EC: Fix bug in choosing targets when racks is not enough. [hadoop]

Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #6192:
URL: https://github.com/apache/hadoop/pull/6192#issuecomment-1764711285

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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Re: [PR] HDFS-17227. EC: Fix bug in choosing targets when racks is not enough. [hadoop]

Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #6192:
URL: https://github.com/apache/hadoop/pull/6192#issuecomment-1766828501

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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Re: [PR] HDFS-17227. EC: Fix bug in choosing targets when racks is not enough. [hadoop]

Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #6192:
URL: https://github.com/apache/hadoop/pull/6192#issuecomment-1766291730

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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   |||| _ Prechecks _ |
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Re: [PR] HDFS-17227. EC: Fix bug in choosing targets when racks is not enough. [hadoop]

Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #6192:
URL: https://github.com/apache/hadoop/pull/6192#issuecomment-1773923690

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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   |||| _ Prechecks _ |
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   | +1 :green_heart: |  @author  |   0m  0s |  |  The patch does not contain any @author tags.  |
   | -1 :x: |  test4tests  |   0m  0s |  |  The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.  |
   |||| _ trunk Compile Tests _ |
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   | +1 :green_heart: |  checkstyle  |   1m 11s |  |  trunk passed  |
   | +1 :green_heart: |  mvnsite  |   1m 21s |  |  trunk passed  |
   | -1 :x: |  javadoc  |   1m  7s | [/branch-javadoc-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6192/1/artifact/out/branch-javadoc-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04.txt) |  hadoop-hdfs in trunk failed with JDK Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04.  |
   | +1 :green_heart: |  javadoc  |   1m 39s |  |  trunk passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05  |
   | +1 :green_heart: |  spotbugs  |   3m 26s |  |  trunk passed  |
   | +1 :green_heart: |  shadedclient  |  41m  8s |  |  branch has no errors when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +1 :green_heart: |  mvninstall  |   1m 10s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   1m 15s |  |  the patch passed with JDK Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04  |
   | +1 :green_heart: |  javac  |   1m 15s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   1m  7s |  |  the patch passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05  |
   | +1 :green_heart: |  javac  |   1m  7s |  |  the patch passed  |
   | +1 :green_heart: |  blanks  |   0m  0s |  |  The patch has no blanks issues.  |
   | +1 :green_heart: |  checkstyle  |   1m  2s |  |  the patch passed  |
   | +1 :green_heart: |  mvnsite  |   1m 16s |  |  the patch passed  |
   | -1 :x: |  javadoc  |   0m 55s | [/patch-javadoc-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6192/1/artifact/out/patch-javadoc-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04.txt) |  hadoop-hdfs in the patch failed with JDK Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04.  |
   | +1 :green_heart: |  javadoc  |   1m 27s |  |  the patch passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05  |
   | +1 :green_heart: |  spotbugs  |   3m 19s |  |  the patch passed  |
   | +1 :green_heart: |  shadedclient  |  40m 49s |  |  patch has no errors when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | -1 :x: |  unit  | 253m 42s | [/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6192/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt) |  hadoop-hdfs in the patch passed.  |
   | +1 :green_heart: |  asflicense  |   0m 49s |  |  The patch does not generate ASF License warnings.  |
   |  |   | 410m 25s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.server.datanode.TestDirectoryScanner |
   |   | hadoop.hdfs.server.namenode.TestReconstructStripedBlocks |
   |   | hadoop.hdfs.TestErasureCodingMultipleRacks |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6192/1/artifact/out/Dockerfile |
   | GITHUB PR | https://github.com/apache/hadoop/pull/6192 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
   | uname | Linux 4e4431e313d6 5.15.0-78-generic #85-Ubuntu SMP Fri Jul 7 15:25:09 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | trunk / 226a9b0ed829be81046612d626d19eaacec094bd |
   | Default Java | Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
   | Multi-JDK versions | /usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.20.1+1-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
   |  Test Results | https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6192/1/testReport/ |
   | Max. process+thread count | 2455 (vs. ulimit of 5500) |
   | modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
   | Console output | https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6192/1/console |
   | versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   


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