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https://issues.apache.org/jira/browse/HDFS-16785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17610667#comment-17610667
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ASF GitHub Bot commented on HDFS-16785:
---------------------------------------

hadoop-yetus commented on PR #4945:
URL: https://github.com/apache/hadoop/pull/4945#issuecomment-1261207290

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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   |||| _ Patch Compile Tests _ |
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   |||| _ Other Tests _ |
   | -1 :x: |  unit  | 337m 53s | 
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4945/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
 |  hadoop-hdfs in the patch passed.  |
   | +1 :green_heart: |  asflicense  |   0m 55s |  |  The patch does not 
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   |  |   | 461m 13s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.server.mover.TestMover |
   
   
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4945/1/testReport/ |
   | Max. process+thread count | 2330 (vs. ulimit of 5500) |
   | modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
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   | Console output | 
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   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
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> DataNode hold BP write lock to scan disk
> ----------------------------------------
>
>                 Key: HDFS-16785
>                 URL: https://issues.apache.org/jira/browse/HDFS-16785
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: ZanderXu
>            Assignee: ZanderXu
>            Priority: Major
>              Labels: pull-request-available
>
> When patching the fine-grained locking of datanode, I  found that `addVolume` 
> will hold the write block of the BP lock to scan the new volume to get the 
> blocks. If we try to add one full volume that was fixed offline before, i 
> will hold the write lock for a long time.
> The related code as bellows:
> {code:java}
> for (final NamespaceInfo nsInfo : nsInfos) {
>   String bpid = nsInfo.getBlockPoolID();
>   try (AutoCloseDataSetLock l = lockManager.writeLock(LockLevel.BLOCK_POOl, 
> bpid)) {
>     fsVolume.addBlockPool(bpid, this.conf, this.timer);
>     fsVolume.getVolumeMap(bpid, tempVolumeMap, ramDiskReplicaTracker);
>   } catch (IOException e) {
>     LOG.warn("Caught exception when adding " + fsVolume +
>         ". Will throw later.", e);
>     exceptions.add(e);
>   }
> } {code}
> And I noticed that this lock is added by HDFS-15382, means that this logic is 
> not in lock before. 



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