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https://issues.apache.org/jira/browse/HBASE-2946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924753#action_12924753
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HBase Review Board commented on HBASE-2946:
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Message from: "Ryan Rawson" <[email protected]>
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trunk/src/main/java/org/apache/hadoop/hbase/regionserver/MemStore.java
<http://review.cloudera.org/r/1088/#comment5541>
your logic is correct, and normally this is an issue, but there is this
line a few down:
now = Math.max(now, kv.getTimestamp());
I havent played with the new sorting thing, the big problem is you get lost
updates via ICV if things dont go right.
I just had a notion, when we do the 'get from memstore first' how do we
handle duplicate TSs in snapshot and kvset... looking at the memstore scanner,
i see this:
return getLower(kvsetNextRow,
snapshotNextRow);
and inside the implementation of getLower(), we return 'kvsetNextRow' when
the two compare to the same. So it should be ok. If it doesn't work out, the
worst case scenario is probably losing 1ms worth of updates.
- Ryan
> Increment multiple columns in a row at once
> -------------------------------------------
>
> Key: HBASE-2946
> URL: https://issues.apache.org/jira/browse/HBASE-2946
> Project: HBase
> Issue Type: New Feature
> Components: client, regionserver
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
>
> Currently there is no way to do multiple increments to a single row in one
> RPC. This jira is about adding an HTable and HRegionInterface method to
> increment multiple columns within a single row at once.
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