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Posted to issues@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2013/03/05 02:40:12 UTC
[jira] [Updated] (HBASE-7952) Remove update() and Improve
ExplicitColumnTracker performance.
[ https://issues.apache.org/jira/browse/HBASE-7952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Hofhansl updated HBASE-7952:
---------------------------------
Fix Version/s: (was: 0.96.0)
0.98.0
It just needs to get committed :)
Targeting 0.98 for now. [~stack], you want this in 0.95?
> Remove update() and Improve ExplicitColumnTracker performance.
> --------------------------------------------------------------
>
> Key: HBASE-7952
> URL: https://issues.apache.org/jira/browse/HBASE-7952
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Affects Versions: 0.94.1, 0.94.5
> Reporter: Raymond Liu
> Assignee: Raymond Liu
> Fix For: 0.98.0
>
> Attachments: HBASE_7952.patch, HBASE_7952_v2.patch, HBASE_7952_v3.patch
>
>
> In ColumnTracker.java, the update() method is not used by anyone now. And no one will call checkColumn for different HFiles with update() in between files to re-walk through the target columns. All columns will be feed to checkColumn() in order.
> So, within ExplicitColumnTracker, the target columns can be optimized to not dynamic maintain a changing list of columns yet to match. Instead, just move index through it is enough.
> with this optimization to save the time for avoid reconstruct a columns array upon each row, the checkColumn method's performance could be improved by 10-20%.
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