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From "Billy Pearson (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-834) Upper bound on files we compact at any one time
Date Sat, 16 Aug 2008 01:53:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Billy Pearson updated HBASE-834:
--------------------------------

    Fix Version/s: 0.3.0
                   0.2.1

Changing this to assign to 2.1 and 3.0 

Just noticed we now have a problem of never removing data from (deletes,ttl,max_version) from
mapfiles If we never compact all the mapfiles at some point.
Currently the only way we do is after a split or if the mapfile sizes are just right to include
all the mapfile in the incremental compaction.

> Upper bound on files we compact at any one time
> -----------------------------------------------
>
>                 Key: HBASE-834
>                 URL: https://issues.apache.org/jira/browse/HBASE-834
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Priority: Minor
>             Fix For: 0.2.1, 0.3.0
>
>
> From Billy in HBASE-64, which we closed because it got pulled all over the place:
> {code}
> Currently we do compaction on a region when the hbase.hstore.compactionThreshold is reached
- default 3
> I thank we should configure a max number of mapfiles to compact at one time simulator
to doing a minor compaction in bigtable. This keep compaction's form getting tied up in one
region to long letting other regions get way to many memcache flushes making compaction take
longer and longer for each region
> If we did that when a regions updates start to slack off the max number will eventuly
include all mapfiles causeing a major compaction on that region. Unlike big table this would
leave the master out of the process and letting the region server handle the major compaction
when it has time.
> When doing a minor compaction on a few files I thank we should compact the newest mapfiles
first leave the larger/older ones for when we have low updates to a region.
> {code}

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