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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8322) Re-enable hbase checksums by default
Date Fri, 12 Apr 2013 23:22:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630750#comment-13630750
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Enis Soztutar commented on HBASE-8322:
--------------------------------------

My understanding of this is, on write path, you will always to compute checksums twice if
you enable the feature (which is fine). On read path, if hadoop1 and non-local reads, you
will checksum twice. Otherwise it will checksum only once.
bq. What if folks have a separate HDFS and HBase clusters (not that that would make sense,
but I think some folks have this)?
What do you mean by having separate clusters? We are not disabling checksums from the hdfs
configuration in any case, right? 
                
> 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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