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From "Jb Lee (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-723) TableServers's cachedRegionLocation doesn't have size limit.
Date Tue, 08 Jul 2008 12:34:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12611553#action_12611553

Jb Lee commented on HBASE-723:

 I confused with old source file (0.1.3?), where the cachedRegionLocations are declared as
 Map<Text, SortedMap<Text, HRegionLocation>>. Sorry.
 I agree with you. With soft references, it may not be the problem.  
 I checked another cache in hbase. HBASE-288 added block cache implementation in HStoreFile
using BlockFSInputStream.  
 "Map<Long, byte[]> blocks" stores blocks, but I can't find the part that remove it
before the BlockFSInputStream object is GCed. 
 I think it can be significant problem if we use block cached table because the block cache
is in regionserver and block data is not so small.
 Do we need to fix it?

Andrew Purtell:
 Hypothetically. Sorry again. 

> TableServers's cachedRegionLocation doesn't have size limit.
> ------------------------------------------------------------
>                 Key: HBASE-723
>                 URL: https://issues.apache.org/jira/browse/HBASE-723
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.1.3
>         Environment: hbase 0.3.0
>            Reporter: Jb Lee
>            Assignee: Andrew Purtell
>            Priority: Minor
> cachedRegionLocation stores region locations of tables whenever new region is looked
up. However, the enties are deleted only when TableServers object is closed or locateRegion
is called with false useCache argument. Therefore, it seems to grow without limit and cause
out of memory exception. 

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