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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8028) Append, Increment don't handle wal-sync exceptions correctly
Date Mon, 11 Mar 2013 21:09:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599303#comment-13599303
] 

Lars Hofhansl commented on HBASE-8028:
--------------------------------------

Approach looks good.
Personally I would prefer to remove all that upsert huh-hah and take the performance hit (which
is measured about 10-15% before).
We're not doing upserts for Puts/Deletes even though that would also be faster; and I do not
see in principle how Append/Increment are different (other than the fact that folks are now
used to the slightly better performance).

                
> Append, Increment don't handle wal-sync exceptions correctly
> ------------------------------------------------------------
>
>                 Key: HBASE-8028
>                 URL: https://issues.apache.org/jira/browse/HBASE-8028
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.94.5
>            Reporter: Himanshu Vashishtha
>            Assignee: Himanshu Vashishtha
>             Fix For: 0.95.0
>
>         Attachments: HBase-8028-v1.patch
>
>
> In case there is an exception while doing the log-sync, the memstore is not rollbacked,
while the mvcc is _always_ forwarded to the writeentry created at the beginning of the operation.
This may lead to scanners seeing results which are not synched to the fs.

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