Akira Ajisaka updated HDFS-11180:
    Release Note: 
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After this fix, the value of the following metrics/JMX can be incorrect.
* LastWrittenTransactionId (FSNameSystem)
* TotalSyncCount (FSNameSystem)
* TransactionsSinceLastLogRoll (FSNameSystem)
* TransactionsSinceLastCheckpoint (FSNameSystem)
* NameJournalStatus (NameNodeMXBean)
* JournalTransactionInfo (NameNodeMXBean)

This is due to the removal of holding lock of FSEditLog when acquiring the 
value of the metrics/JMX.
     Component/s: namenode

> Intermittent deadlock in NameNode when failover happens.
> --------------------------------------------------------
>                 Key: HDFS-11180
>                 URL: https://issues.apache.org/jira/browse/HDFS-11180
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.0
>            Reporter: Abhishek Modi
>            Assignee: Akira Ajisaka
>            Priority: Blocker
>              Labels: high-availability
>         Attachments: HDFS-11180.00.patch, HDFS-11180.01.patch, 
> HDFS-11180.02.patch, HDFS-11180.03.patch, HDFS-11180.04.patch, jstack.log
> It is happening due to metrics getting updated at the same time when failover 
> is happening. Please find attached jstack at that point of time.

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