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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-723) TableServers's cachedRegionLocation doesn't have size limit.
Date Mon, 07 Jul 2008 02:39:31 GMT

    [ https://issues.apache.org/jira/browse/HBASE-723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12610879#action_12610879
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Andrew Purtell commented on HBASE-723:
--------------------------------------

Also while on the subject, there is no means for other parts of the client API to invalidate
cache entries on demand. While writing a testcase for HBASE-62, I observed that table metadata
is cached as part of the cached region information and this is not invalidated by disable/enable
table, so to get up to date metadata the client has to use a scanner over .META. directly
using the meta visitor. Ideally my client-side support for metadata updates (HBaseAdmin.updateTableMeta(byte[]
table, HTableDescriptor htd)) could call into this cache to invalidate entries related to
the table, so then the next HTable.getTableDescriptor() would go to meta to return up to date
information. 

> 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
>            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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