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https://issues.apache.org/jira/browse/HDFS-1172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14950942#comment-14950942
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Jing Zhao commented on HDFS-1172:
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Thanks [~iwasakims]! The 013 patch looks pretty good to me. Only nit is we can
change the following if condition to {{if (b && !lastBlock.isStriped())}} to
make sure we do not put duplicated records into the pending queue. Other than
this +1.
{code}
if (!bc.isStriped()) {
addExpectedReplicasToPending(lastBlock);
}
{code}
> 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: Masatake Iwasaki
> Attachments: HDFS-1172-150907.patch, HDFS-1172.008.patch,
> HDFS-1172.009.patch, HDFS-1172.010.patch, HDFS-1172.011.patch,
> HDFS-1172.012.patch, HDFS-1172.013.patch, HDFS-1172.patch, hdfs-1172.txt,
> hdfs-1172.txt, replicateBlocksFUC.patch, replicateBlocksFUC1.patch,
> replicateBlocksFUC1.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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