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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1172) Blocks in newly completed files are considered under-replicated too quickly
Date Thu, 21 Mar 2013 17:39:17 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-1172:
------------------------------

    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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