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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8322) Re-enable hbase checksums by default
Date Fri, 12 Apr 2013 23:00:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630722#comment-13630722
] 

Lars Hofhansl commented on HBASE-8322:
--------------------------------------

I am somewhat neutral about this. We disabled it, because unless short circuit reading is
enabled (or if the data is read by the region server is not local) we'd actually calculate
the checksum twice.
What if folks have a separate HDFS and HBase clusters (not that that would make sense, but
I think some folks have this)? In that case, would we always calculate the checksum twice?
                
> Re-enable hbase checksums by default
> ------------------------------------
>
>                 Key: HBASE-8322
>                 URL: https://issues.apache.org/jira/browse/HBASE-8322
>             Project: HBase
>          Issue Type: Improvement
>          Components: Filesystem Integration
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: hbase-8322_v1.patch
>
>
> Double checksumming issues in HBase level checksums(HBASE-5074) has been fixed in HBASE-6868.
However, that patch also disables hbase checksums by default. I think we should re-enable
it by default, and document the interaction with shortcircuit reads. 

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