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