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Posted to hdfs-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2023/09/11 17:25:00 UTC
[jira] [Commented] (HDFS-16000) HDFS : Rename performance optimization
[ https://issues.apache.org/jira/browse/HDFS-16000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763839#comment-17763839 ]
ASF GitHub Bot commented on HDFS-16000:
---------------------------------------
hadoop-yetus commented on PR #2964:
URL: https://github.com/apache/hadoop/pull/2964#issuecomment-1714295665
:broken_heart: **-1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
|:----:|----------:|--------:|:--------:|:-------:|
| +0 :ok: | reexec | 0m 28s | | Docker mode activated. |
|||| _ Prechecks _ |
| +1 :green_heart: | dupname | 0m 0s | | No case conflicting files found. |
| +0 :ok: | codespell | 0m 1s | | codespell was not available. |
| +0 :ok: | detsecrets | 0m 1s | | detect-secrets was not available. |
| +1 :green_heart: | @author | 0m 0s | | The patch does not contain any @author tags. |
| +1 :green_heart: | test4tests | 0m 0s | | The patch appears to include 1 new or modified test files. |
|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 32m 28s | | trunk passed |
| +1 :green_heart: | compile | 0m 55s | | trunk passed with JDK Ubuntu-11.0.20+8-post-Ubuntu-1ubuntu120.04 |
| +1 :green_heart: | compile | 0m 49s | | trunk passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
| +1 :green_heart: | checkstyle | 0m 44s | | trunk passed |
| +1 :green_heart: | mvnsite | 0m 56s | | trunk passed |
| +1 :green_heart: | javadoc | 0m 50s | | trunk passed with JDK Ubuntu-11.0.20+8-post-Ubuntu-1ubuntu120.04 |
| +1 :green_heart: | javadoc | 1m 18s | | trunk passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
| +1 :green_heart: | spotbugs | 2m 2s | | trunk passed |
| +1 :green_heart: | shadedclient | 22m 28s | | branch has no errors when building and testing our client artifacts. |
|||| _ Patch Compile Tests _ |
| +1 :green_heart: | mvninstall | 0m 46s | | the patch passed |
| +1 :green_heart: | compile | 0m 46s | | the patch passed with JDK Ubuntu-11.0.20+8-post-Ubuntu-1ubuntu120.04 |
| +1 :green_heart: | javac | 0m 46s | | the patch passed |
| +1 :green_heart: | compile | 0m 42s | | the patch passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
| +1 :green_heart: | javac | 0m 42s | | the patch passed |
| +1 :green_heart: | blanks | 0m 0s | | The patch has no blanks issues. |
| +1 :green_heart: | checkstyle | 0m 35s | | the patch passed |
| +1 :green_heart: | mvnsite | 0m 49s | | the patch passed |
| +1 :green_heart: | javadoc | 0m 38s | | the patch passed with JDK Ubuntu-11.0.20+8-post-Ubuntu-1ubuntu120.04 |
| +1 :green_heart: | javadoc | 1m 10s | | the patch passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05 |
| +1 :green_heart: | spotbugs | 1m 52s | | the patch passed |
| +1 :green_heart: | shadedclient | 22m 8s | | patch has no errors when building and testing our client artifacts. |
|||| _ Other Tests _ |
| -1 :x: | unit | 195m 49s | [/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2964/5/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt) | hadoop-hdfs in the patch passed. |
| +1 :green_heart: | asflicense | 0m 39s | | The patch does not generate ASF License warnings. |
| | | 290m 23s | | |
| Reason | Tests |
|-------:|:------|
| Failed junit tests | hadoop.hdfs.server.namenode.snapshot.TestSnapshotRename |
| | hadoop.hdfs.server.namenode.TestFSImageWithSnapshot |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2964/5/artifact/out/Dockerfile |
| GITHUB PR | https://github.com/apache/hadoop/pull/2964 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux bfbb4eff844e 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / b3ebd6c491dac676e6d68f4f72737557e492a49a |
| 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+8-post-Ubuntu-1ubuntu120.04 /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/job/PR-2964/5/testReport/ |
| Max. process+thread count | 3402 (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/job/PR-2964/5/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.
> HDFS : Rename performance optimization
> --------------------------------------
>
> Key: HDFS-16000
> URL: https://issues.apache.org/jira/browse/HDFS-16000
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, namenode
> Affects Versions: 3.1.4, 3.3.1
> Reporter: Xiangyi Zhu
> Assignee: Xiangyi Zhu
> Priority: Major
> Labels: pull-request-available
> Attachments: 20210428-143238.svg, 20210428-171635-lambda.svg, HDFS-16000.patch
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> It takes a long time to move a large directory with rename. For example, it takes about 40 seconds to move a 1000W directory. When a large amount of data is deleted to the trash, the move large directory will occur when the recycle bin makes checkpoint. In addition, the user may also actively trigger the move large directory operation, which will cause the NameNode to lock too long and be killed by Zkfc. Through the flame graph, it is found that the main time consuming is to create the EnumCounters object.
> h3. I think the following two points can optimize the efficiency of rename execution
> h3. QuotaCount calculation time-consuming optimization:
> * Create a QuotaCounts object in the calculation directory quotaCount, and pass the quotaCount to the next calculation function through a parameter each time, so as to avoid creating an EnumCounters object for each calculation.
> * In addition, through the flame graph, it is found that using lambda to modify QuotaCounts takes longer than the ordinary method, so the ordinary method is used to modify the QuotaCounts count.
> h3. Rename logic optimization:
> * Regardless of whether the rename operation is the source directory and the target directory, the quota count must be calculated three times. The first time, check whether the moved directory exceeds the target directory quota, the second time, calculate the mobile directory quota to update the source directory quota, and the third time, calculate the mobile directory configuration update to the target directory.
> * I think some of the above three quota quota calculations are unnecessary. For example, if all parent directories of the source directory and target directory are not configured with quota, there is no need to calculate quotaCount. Even if both the source directory and the target directory use quota, there is no need to calculate the quota three times. The calculation logic for the first and third times is the same, and it only needs to be calculated once.
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