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https://issues.apache.org/jira/browse/HBASE-618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-618:
------------------------
Status: Patch Available (was: Open)
Looking for a review.
> We always compact if 2 files, regardless of the compaction threshold setting
> ----------------------------------------------------------------------------
>
> Key: HBASE-618
> URL: https://issues.apache.org/jira/browse/HBASE-618
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.2.0, 0.1.2
> Reporter: stack
> Priority: Blocker
> Fix For: 0.2.0, 0.1.2
>
> Attachments: compaction.patch
>
>
> We will always compact if there are two files in a store. Here is an
> illustration from a loading run against 0.1.2 candidate:
> {code}
> 2008-05-06 18:25:42,255 INFO org.apache.hadoop.hbase.HRegion: starting
> compaction on region category_rule_pricebin_statistics,,1210116131965
> 2008-05-06 18:25:42,259 DEBUG org.apache.hadoop.hbase.HStore: started
> compaction of 2 files [329657396/confidence_interval/1251369679869294899,
> 329657396/confidence_interval/5238351815319958452] into
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/confidence_interval/mapfiles/6688946093979715350
> 2008-05-06 18:25:46,223 DEBUG org.apache.hadoop.hbase.HStore: moving
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/confidence_interval/mapfiles/6688946093979715350
> to
> /hbase/category_rule_pricebin_statistics/329657396/confidence_interval/mapfiles/6019580165435904305
> 2008-05-06 18:25:46,329 DEBUG org.apache.hadoop.hbase.HStore: started
> compaction of 2 files [329657396/rule_id/4877828519309794708,
> 329657396/rule_id/3736239181369788409] into
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/rule_id/mapfiles/6451418039787481756
> 2008-05-06 18:25:50,273 DEBUG org.apache.hadoop.hbase.HStore: moving
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/rule_id/mapfiles/6451418039787481756
> to
> /hbase/category_rule_pricebin_statistics/329657396/rule_id/mapfiles/1365174520347083269
> 2008-05-06 18:25:50,338 DEBUG org.apache.hadoop.hbase.HStore: started
> compaction of 2 files [329657396/hidden_variable/7348598912095388790,
> 329657396/hidden_variable/1402264537929464657] into
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/hidden_variable/mapfiles/7895992615693344978
> 2008-05-06 18:25:54,103 DEBUG org.apache.hadoop.hbase.HStore: moving
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/hidden_variable/mapfiles/7895992615693344978
> to
> /hbase/category_rule_pricebin_statistics/329657396/hidden_variable/mapfiles/4450886729060218942
> 2008-05-06 18:25:54,155 DEBUG org.apache.hadoop.hbase.HStore: started
> compaction of 2 files [329657396/category_id/6976628214412388959,
> 329657396/category_id/8426537623290869905] into
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/category_id/mapfiles/4017716533879305176
> 2008-05-06 18:25:57,698 DEBUG org.apache.hadoop.hbase.HStore: moving
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/category_id/mapfiles/4017716533879305176
> to
> /hbase/category_rule_pricebin_statistics/329657396/category_id/mapfiles/657561173732096591
> 2008-05-06 18:25:57,747 DEBUG org.apache.hadoop.hbase.HStore: started
> compaction of 2 files [329657396/price_bin_id/165701488423589566,
> 329657396/price_bin_id/5537046322320665760] into
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/price_bin_id/mapfiles/3214618236668106036
> 2008-05-06 18:26:01,135 DEBUG org.apache.hadoop.hbase.HStore: moving
> /hbase/category_rule_pricebin_statistics/compaction.dir/329657396/price_bin_id/mapfiles/3214618236668106036
> to
> /hbase/category_rule_pricebin_statistics/329657396/price_bin_id/mapfiles/8727588456978537416
> 2008-05-06 18:26:01,181 INFO org.apache.hadoop.hbase.HRegion: compaction
> completed on region category_rule_pricebin_statistics,,1210116131965 in 18sec
> {code}
> In the above, the region has 6 families, each of which is being loaded fairly
> evenly. Every time through we'll compact a store if two files, which just
> so happens to be most of the time in this case.
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