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https://issues.apache.org/jira/browse/HDFS-1350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12901266#action_12901266
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Todd Lipcon commented on HDFS-1350:
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I believe the way 20-append works is that it won't use that replica if there
are other replicas where the checksum and data length do match up. If *all* of
them are incorrect, it falls back to the old behavior of truncating. If we're
too aggressive with the truncation, we risk truncating back before the last
sync() offset, I think. HDFS-1218 changes the behavior here a bit, though - I
think that's one of the patches that hasn't made it into the branch yet?
> make datanodes do graceful shutdown
> -----------------------------------
>
> Key: HDFS-1350
> URL: https://issues.apache.org/jira/browse/HDFS-1350
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Reporter: sam rash
> Assignee: sam rash
>
> we found that the Datanode doesn't do a graceful shutdown and a block can be
> corrupted (data + checksum amounts off)
> we can make the DN do a graceful shutdown in case there are open files. if
> this presents a problem to a timely shutdown, we can make a it a parameter of
> how long to wait for the full graceful shutdown before just exiting
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