[jira] [Work logged] (HDFS-16600) Deadlock on DataNode

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16600?focusedWorklogId=778436&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-778436 ]

ASF GitHub Bot logged work on HDFS-16600:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 05/Jun/22 09:27
            Start Date: 05/Jun/22 09:27
    Worklog Time Spent: 10m 
      Work Description: MingXiangLi commented on PR #4367:
URL: https://github.com/apache/hadoop/pull/4367#issuecomment-1146772397

   @ZanderXu  LGTM.The core logic in HDFS-16534 is change block pool write lock to read lock and add volume lock for each replica under this block pool.And we didn't change this method in HDFS-16534 because it's not a heavy call. So this commit is makes sense to me.




Issue Time Tracking
-------------------

    Worklog Id:     (was: 778436)
    Time Spent: 1h 20m  (was: 1h 10m)

> Deadlock on DataNode
> --------------------
>
>                 Key: HDFS-16600
>                 URL: https://issues.apache.org/jira/browse/HDFS-16600
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: ZanderXu
>            Assignee: ZanderXu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> The UT org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.testSynchronousEviction failed, because happened deadlock, which  is introduced by [HDFS-16534|https://issues.apache.org/jira/browse/HDFS-16534]. 
> DeadLock:
> {code:java}
> // org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.createRbw line 1588 need a read lock
> try (AutoCloseableLock lock = lockManager.readLock(LockLevel.BLOCK_POOl,
>         b.getBlockPoolId()))
> // org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.evictBlocks line 3526 need a write lock
> try (AutoCloseableLock lock = lockManager.writeLock(LockLevel.BLOCK_POOl, bpid))
> {code}



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