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https://issues.apache.org/jira/browse/HDFS-14794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16964455#comment-16964455
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Wei-Chiu Chuang edited comment on HDFS-14794 at 10/31/19 11:41 PM:
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reportBadBlock is initiated by client or DataNode when they detect a block is
bad.
And then it is up to the active NameNode to schedule a replica for the bad
block / invalidation.
There would be a period of time where observer thinks a bad block is still
good. But hopefully the duration is short. Client would retry other replicas
IIRC. It's might be okay for observer to process reportBadBlock and mark a
block replica corrupt but it should not try to schedule block replication/
invalidation.
In summary, I don't think it affect correctness. Maybe a little drop in
availability.
was (Author: jojochuang):
reportBadBlock is initiated by client or DataNode when they detect a block is
bad.
And then it is up to the active NameNode to schedule a replica for the bad
block / invalidation.
There would be a period of time where observer thinks a bad block is still
good. But hopefully the duration is short. Client would retry other replicas
IIRC. It's might be okay for observer to process reportBadBlock and mark a
block replica corrupt but it should not try to schedule block replication/
invalidation.
> [SBN read] reportBadBlock is rejected by Observer.
> --------------------------------------------------
>
> Key: HDFS-14794
> URL: https://issues.apache.org/jira/browse/HDFS-14794
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 2.10.0
> Reporter: Konstantin Shvachko
> Priority: Major
>
> {{reportBadBlock}} is rejected by Observer via StandbyException
> {code}StandbyException: Operation category WRITE is not supported in state
> observer{code}
> We should investigate what are the consequences of this and if we should
> treat {{reportBadBlock}} as IBRs. Note that {{reportBadBlock}} is a part of
> both {{ClientProtocol}} and {{DatanodeProtocol}}
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