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https://issues.apache.org/jira/browse/HDFS-5723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13969320#comment-13969320
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Vinayakumar B commented on HDFS-5723:
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Hi, Can someone take look at updated patch?
Thanks in advance
> Append failed FINALIZED replica should not be accepted as valid when that
> block is underconstruction
> ----------------------------------------------------------------------------------------------------
>
> Key: HDFS-5723
> URL: https://issues.apache.org/jira/browse/HDFS-5723
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.2.0
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Attachments: HDFS-5723.patch, HDFS-5723.patch
>
>
> Scenario:
> 1. 3 node cluster with
> dfs.client.block.write.replace-datanode-on-failure.enable set to false.
> 2. One file is written with 3 replicas, blk_id_gs1
> 3. One of the datanode DN1 is down.
> 4. File was opened with append and some more data is added to the file and
> synced. (to only 2 live nodes DN2 and DN3)-- blk_id_gs2
> 5. Now DN1 restarted
> 6. In this block report, DN1 reported FINALIZED block blk_id_gs1, this should
> be marked corrupted.
> but since NN having appended block state as UnderConstruction, at this time
> its not detecting this block as corrupt and adding to valid block locations.
> As long as the namenode is alive, this datanode also will be considered as
> valid replica and read/append will fail in that datanode.
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