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https://issues.apache.org/jira/browse/HBASE-3082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924069#action_12924069
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HBase Review Board commented on HBASE-3082:
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Message from: "Ryan Rawson" <[email protected]>
bq. On 2010-10-20 21:41:23, Ryan Rawson wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java,
line 155
bq. > <http://review.cloudera.org/r/1053/diff/2/?file=15063#file15063line155>
bq. >
bq. > Would this code be cleaner if we didnt have to use instanceof?
bq.
bq. khemani wrote:
bq. yes, i agree it will be cleaner w/o instanceof. But in that case we
will have to pass the flags all the way from HRegion to StoreScanner. A number
of signatures will have to change.
bq.
bq. Another approach could be to only instantiate InternalScan in the
server side. But again that is quite a bit of code change.
bq.
bq. Having an internal-scan should be useful. After all, a scan touches a
lot of data and certain other tasks can potentially be piggybacked on a scan.
ok that makes sense. let's go with it then.
- Ryan
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> For ICV gets, first look in MemStore before reading StoreFiles
> --------------------------------------------------------------
>
> Key: HBASE-3082
> URL: https://issues.apache.org/jira/browse/HBASE-3082
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Jonathan Gray
> Assignee: Prakash Khemani
>
> For incrementColumnValue operations, it is possible to check MemStore for the
> column being incremented without sacrificing correctness. If the column is
> not found in MemStore, we would then have to do a normal Get that
> opens/checks all StoreFiles for the given Store.
> In practice, this makes increment operations significantly faster for
> recently/frequently incremented columns.
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