[jira] [Commented] (HDFS-1172) Blocks in newly completed files are considered under-replicated too quickly

["Amareshwari Sriramadasu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-1172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13595734#comment-13595734 ] 

Amareshwari Sriramadasu commented on HDFS-1172:
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@Todd, Is there any update on this? 
We are hitting similar issue in our cluster and number of excess blocks are reaching to 1 Lakh in a day. I raised HDFS-4562 for the same, which would be duplicate of this.

                
> Blocks in newly completed files are considered under-replicated too quickly
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-1172
>                 URL: https://issues.apache.org/jira/browse/HDFS-1172
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 0.21.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.24.0
>
>         Attachments: HDFS-1172.patch, hdfs-1172.txt, hdfs-1172.txt, replicateBlocksFUC1.patch, replicateBlocksFUC1.patch, replicateBlocksFUC.patch
>
>
> I've seen this for a long time, and imagine it's a known issue, but couldn't find an existing JIRA. It often happens that we see the NN schedule replication on the last block of files very quickly after they're completed, before the other DNs in the pipeline have a chance to report the new block. This results in a lot of extra replication work on the cluster, as we replicate the block and then end up with multiple excess replicas which are very quickly deleted.

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