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Posted to hdfs-dev@hadoop.apache.org by "ZanderXu (Jira)" <ji...@apache.org> on 2022/10/11 08:26:00 UTC
[jira] [Resolved] (HDFS-16774) Improve async delete replica on datanode
[ https://issues.apache.org/jira/browse/HDFS-16774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ZanderXu resolved HDFS-16774.
-----------------------------
Fix Version/s: 3.4.0
Resolution: Fixed
> 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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