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https://issues.apache.org/jira/browse/HDFS-604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12753344#action_12753344
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Hairong Kuang commented on HDFS-604:
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1. When a block is under construction, a block report should not update an
existing replica's state or add a replica to toRemoved list. NN should only
allow to add new replicas. Otherwise, it will have race condition with client
updated pipeline.
2. NN should not add storedBlock to toCorrupt list if storedBlock' GS is not
the same as that of the reported replica. Otherwise a wrong GS of the replica
will get deleted.
Other issues we have discussed:
1. When fetching stored block, GS should not be part of the key. HDFS-512 is
not committed yet.
2. For safemode, we should count only complete blocks and finalized replicas.
> Block report processing for append
> ----------------------------------
>
> Key: HDFS-604
> URL: https://issues.apache.org/jira/browse/HDFS-604
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: Append Branch
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Fix For: Append Branch
>
> Attachments: BlockReportNN.patch, BlockReportNN.patch
>
>
> Implement new block report processing on the name-node as stated in the
> append design and HDFS-576.
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