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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4199) blockCache summary - backend
Date Fri, 19 Aug 2011 03:04:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087475#comment-13087475
] 

stack commented on HBASE-4199:
------------------------------

On 1., BlockCacheColumnFamilySummary?  CF needs the table to qualify it but scope is column
family?

On 2., Normally that is so but looking in the Interfaces, e.g. HRegionInterface.java, I see
that some methods take Lists.

This is the class that does the serialization: src/main/java/org/apache/hadoop/hbase/io/HbaseObjectWritable.java

It seems to do some special stuff to do a List.

Presumes List of Writables.

On 3., Yeah.  That was obvious (smile).

On 4., Yes.  You thing it will be invoked frequently?

On 5., Hmm... yeah, or just check for null when serializing.

Good stuff.

> blockCache summary - backend
> ----------------------------
>
>                 Key: HBASE-4199
>                 URL: https://issues.apache.org/jira/browse/HBASE-4199
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Doug Meil
>            Assignee: Doug Meil
>            Priority: Minor
>         Attachments: java_HBASE_4199.patch, java_HBASE_4199_v2.patch, java_HBASE_4199_v3.patch
>
>
> This is the backend work for the blockCache summary.  Change to BlockCache interface,
Summarization in LruBlockCache, BlockCacheSummaryEntry, addition to HRegionInterface, and
HRegionServer.
> This will NOT include any of the web UI or anything else like that.  That is for another
sub-task.

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