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https://issues.apache.org/jira/browse/HDFS-15943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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JiangHua Zhu updated HDFS-15943:
--------------------------------
Description:
In HeartbeatManager#Monitor, due to the lack of more restrictions, multiple
heartbeatCheck() will be executed at the same time.
Code:
if (lastHeartbeatCheck + heartbeatRecheckInterval <now) {
heartbeatCheck();
}
was:
Inside HeartbeatManager#heartbeatCheck(), a variable is defined here:
DatanodeDescriptor dead = null;
In fact, when HeartbeatManager#heartbeatCheck() is executed, it will cause the
DatanodeManger to modify the data not in time.
Code:
DatanodeDescriptor dead = null;
synchronized(this) {
......
}
if (dead != null) {
......
dm.removeDeadDatanode(dead, !dead.isMaintenance());
......
}
And we will not prevent the simultaneous execution of heartbeatCheck() twice.
> Solve that multiple HeartbeatManager#heartbeatCheck() will be executed at the
> same time
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-15943
> URL: https://issues.apache.org/jira/browse/HDFS-15943
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: JiangHua Zhu
> Assignee: JiangHua Zhu
> Priority: Major
>
> In HeartbeatManager#Monitor, due to the lack of more restrictions, multiple
> heartbeatCheck() will be executed at the same time.
> Code:
> if (lastHeartbeatCheck + heartbeatRecheckInterval <now) {
> heartbeatCheck();
> }
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