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https://issues.apache.org/jira/browse/HDFS-16898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He updated HDFS-16898:
-------------------------------
Summary: Remove write lock for processCommandFromActor of DataNode to
reduce impact on heartbeat (was: Make write lock fine-grain in
processCommandFromActor method)
> Remove write lock for processCommandFromActor of DataNode to reduce impact on
> heartbeat
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-16898
> URL: https://issues.apache.org/jira/browse/HDFS-16898
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.3.4
> Reporter: ZhangHB
> Assignee: ZhangHB
> Priority: Major
> Labels: pull-request-available
>
> Now in method processCommandFromActor, we have code like below:
>
> {code:java}
> writeLock();
> try {
> if (actor == bpServiceToActive) {
> return processCommandFromActive(cmd, actor);
> } else {
> return processCommandFromStandby(cmd, actor);
> }
> } finally {
> writeUnlock();
> } {code}
> if method processCommandFromActive costs much time, the write lock would not
> release.
>
> It maybe block the updateActorStatesFromHeartbeat method in
> offerService，furthermore, it can cause the lastcontact of datanode very high,
> even dead when lastcontact beyond 600s.
> {code:java}
> bpos.updateActorStatesFromHeartbeat(
> this, resp.getNameNodeHaState());{code}
> here we can make write lock fine-grain in processCommandFromActor method to
> address this problem
>
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