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https://issues.apache.org/jira/browse/HDFS-17300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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liuguanghua updated HDFS-17300:
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Description:
Now when Observer is enable, Observer will update its stateid through that
EditLogTailer near-real-time tailing editlog form Active Namenode. And if a rpc
call's stateid is lower than client stateid which may update from active
namenode with msync, the call will be requeued into callqueue.
This PR is intend to if a rpc call's stateid is always lower than client statid
for a configured time , the call should throw ObserverRetryOnActiveException
for client and client will go to active namenode for processing.
was:
Now when Observer NN is used, if the stateid is delayed , the
rpcServer will be requeued into callqueue. If EditLogTailer is broken or
something else wrong , the call will be requeued again and again.
So Observer should throw ObserverRetryOnActiveException if stateid is
always delayed with Active Namenode for a configured time.
> [SBN READ] A rcp call in Observer should throw
> ObserverRetryOnActiveException if its stateid is always lower than client
> stateid for a configured time.
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-17300
> URL: https://issues.apache.org/jira/browse/HDFS-17300
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: liuguanghua
> Priority: Major
> Labels: pull-request-available
>
>
> Now when Observer is enable, Observer will update its stateid through that
> EditLogTailer near-real-time tailing editlog form Active Namenode. And if a
> rpc call's stateid is lower than client stateid which may update from active
> namenode with msync, the call will be requeued into callqueue.
> This PR is intend to if a rpc call's stateid is always lower than client
> statid for a configured time , the call should throw
> ObserverRetryOnActiveException for client and client will go to active
> namenode for processing.
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