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https://issues.apache.org/jira/browse/HDFS-16774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan updated HDFS-16774:
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Component/s: datanode
> Improve async delete replica on datanode
> ----------------------------------------
>
> Key: HDFS-16774
> URL: https://issues.apache.org/jira/browse/HDFS-16774
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> 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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