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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-1326) hbase doesn't size memcache correctly under -XX:+UseG1GC
Date Thu, 30 Apr 2009 23:03:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ryan rawson resolved HBASE-1326.
--------------------------------

    Resolution: Invalid

JVM bug, to workaround set -Xms 

> hbase doesn't size memcache correctly under -XX:+UseG1GC
> --------------------------------------------------------
>
>                 Key: HBASE-1326
>                 URL: https://issues.apache.org/jira/browse/HBASE-1326
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>         Environment: java 1.7
>            Reporter: ryan rawson
>             Fix For: 0.20.0
>
>
> I get this in the logfile:
> 2009-04-16 23:49:20,518 INFO org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Forced
flushing of <table redacted>,1239954535262 because global memcache limit of 3.2m exceeded;
currently 3.2m and flushing till 2.0m
> With the experimental G1 GC, the heap size is created differently, and the way we calculate
the size of memcache is flawed under this GC.  This affects performance and makes things reallll
slow.

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