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From "Himanshu Vashishtha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8028) Append, Increment don't handle wal-sync exceptions correctly
Date Mon, 11 Mar 2013 21:25:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599329#comment-13599329

Himanshu Vashishtha commented on HBASE-8028:

Lars: Thanks.
A 10-15% hit is something one can't ignore. And, moreover, it also reduces the flush size
(and eventually compactions i/o), that's why I think it's okay to keep upserts.
> 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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