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https://issues.apache.org/jira/browse/HDFS-2130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142476#comment-13142476
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Eli Collins commented on HDFS-2130:
-----------------------------------
After paging in the relevant info I think approach #2 makes sense. I don't
think we'll need to change the chunk size and the slight performance hit is
only when filling up the last block of files being appended that were created
in previous releases (they can always switch the default if they really care,
but they shouldn't).
+1 to the latest patch
> Switch default checksum to CRC32C
> ---------------------------------
>
> Key: HDFS-2130
> URL: https://issues.apache.org/jira/browse/HDFS-2130
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs client
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-2130.txt, hdfs-2130.txt
>
>
> Once the other subtasks/parts of HDFS-2080 are complete, CRC32C will be a
> much more efficient checksum algorithm than CRC32. Hence we should change the
> default checksum to CRC32C.
> However, in order to continue to support append against blocks created with
> the old checksum, we will need to implement some kind of handshaking in the
> write pipeline.
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