[jira] [Updated] (HDFS-16774) Improve async delete replica on datanode

["ZanderXu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ZanderXu updated HDFS-16774:
----------------------------
    Hadoop Flags: Reviewed

> Improve async delete replica on datanode
> ----------------------------------------
>
>                 Key: HDFS-16774
>                 URL: https://issues.apache.org/jira/browse/HDFS-16774
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Haiyang Hu
>            Assignee: Haiyang Hu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>
> In our online cluster, a large number of ReplicaNotFoundExceptions occur when client reads the data.
> After tracing the root cause, it is caused by the asynchronous deletion of the replica operation has  many stacked pending deletion  caused ReplicationNotFoundException.
> Current the asynchronous delete of the replica operation process is as follows：
> 1.remove the replica from the ReplicaMap
> 2.delete the replica file on the disk [blocked in threadpool]
> 3.notifying namenode through IBR [blocked in threadpool]
> In order to avoid similar problems as much as possible, consider optimizing the execution flow：
> The deleting replica from ReplicaMap, deleting replica from disk and notifying namenode through IBR are processed in the same asynchronous thread.



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