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https://issues.apache.org/jira/browse/HDFS-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824286#comment-13824286
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Colin Patrick McCabe commented on HDFS-5521:
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I guess the TCP and IP checksums are pretty trivial-- basically something
similar to summing the value of the bytes. I wish we had more data on the
subject of how common network errors were.
> skip checksums when reading a cached block via non-local reads
> --------------------------------------------------------------
>
> Key: HDFS-5521
> URL: https://issues.apache.org/jira/browse/HDFS-5521
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: 3.0.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
>
> The DataNode needs to skip checksumming when reading a cached block via
> non-local reads. This is like HDFS-5182, but for non-short-circuit.
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