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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1281) flush the METADATA table after GC
Date Wed, 17 Apr 2013 00:31:15 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13633599#comment-13633599
] 

Hudson commented on ACCUMULO-1281:
----------------------------------

Integrated in Accumulo-Trunk #833 (See [https://builds.apache.org/job/Accumulo-Trunk/833/])
    ACCUMULO-1281 use the new authenticater api (Revision 1468546)
ACCUMULO-1281 flush and compact the !METADATA table after a gc cycle (Revision 1468533)

     Result = SUCCESS
ecn : 
Files : 
* /accumulo/trunk
* /accumulo/trunk/assemble
* /accumulo/trunk/core
* /accumulo/trunk/examples
* /accumulo/trunk/fate/src/main/java/org/apache/accumulo/fate/ZooStore.java
* /accumulo/trunk/fate/src/main/java/org/apache/accumulo/fate/zookeeper/ZooSession.java
* /accumulo/trunk/pom.xml
* /accumulo/trunk/server
* /accumulo/trunk/server/src/main/java/org/apache/accumulo/server/gc/SimpleGarbageCollector.java
* /accumulo/trunk/src

ecn : 
Files : 
* /accumulo/trunk
* /accumulo/trunk/assemble
* /accumulo/trunk/core
* /accumulo/trunk/examples
* /accumulo/trunk/fate/src/main/java/org/apache/accumulo/fate/ZooStore.java
* /accumulo/trunk/fate/src/main/java/org/apache/accumulo/fate/zookeeper/ZooSession.java
* /accumulo/trunk/pom.xml
* /accumulo/trunk/server
* /accumulo/trunk/server/src/main/java/org/apache/accumulo/server/gc/SimpleGarbageCollector.java
* /accumulo/trunk/src

                
> flush the METADATA table after GC
> ---------------------------------
>
>                 Key: ACCUMULO-1281
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1281
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: gc
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>            Priority: Trivial
>             Fix For: 1.5.0
>
>
> The METADATA table is often small, with many in-memory writes.  Because it is small,
it does not normally get flushed, which will prune data with the versioning/delete iterators.
 Over time, the many in-memory versions can cause poor performance.
> The file garbage collector (gc) will make lots of updates as it runs.  That would be
a perfect time to flush the table and prune the versions.

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