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Posted to hdfs-issues@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2013/11/15 23:13:21 UTC

[jira] [Commented] (HDFS-5521) skip checksums when reading a cached block via non-local reads

    [ https://issues.apache.org/jira/browse/HDFS-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824162#comment-13824162 ] 

Andrew Wang commented on HDFS-5521:
-----------------------------------

I think we still want checksumming for remote reads. TCP / ethernet checksums aren't that strong, and networks are likely a bigger source of errors than disks.

> 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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