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https://issues.apache.org/jira/browse/HDFS-1034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12844270#action_12844270
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Todd Lipcon commented on HDFS-1034:
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Only scary thing about moving checksums to a different mountpoint is that the
checksum file's metadata will be on a different journal than the data files.
This might end up fine, but it's a little nervewracking in terms of what kind
of consistency we get out of the FS - could cause some very subtle bugs.
Have we seen these issues to be a significant bottleneck?
> Enhance datanode to read data and checksum file in parallel
> -----------------------------------------------------------
>
> Key: HDFS-1034
> URL: https://issues.apache.org/jira/browse/HDFS-1034
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> In the current HDFS implementation, a read of a block issued to the datanode
> results in a disk access to the checksum file followed by a disk access to
> the checksum file. It would be nice to be able to do these two IOs in
> parallel to reduce read latency.
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