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https://issues.apache.org/jira/browse/HDFS-1172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-1172:
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Assignee: (was: Todd Lipcon)
Hey folks. Sorry I let this one drop off my radar for a couple years :) I don't
think I'll have time to work on it in the coming months, so if you want to take
it over, go ahead. I think the remaining issue was that the test coverage is
still a little weak (and will probably need significant rebasing for 2.x/3.x)
> 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
> 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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