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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5311) Allow inmemory Memstore compactions
Date Tue, 07 Feb 2012 20:54:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202771#comment-13202771
] 

Zhihong Yu commented on HBASE-5311:
-----------------------------------

In enterSection():
{code}
      AtomicInteger i = counts[counts.length % hash];
{code}
I think the above may produce ArrayIndexOutOfBoundsException.
                
> Allow inmemory Memstore compactions
> -----------------------------------
>
>                 Key: HBASE-5311
>                 URL: https://issues.apache.org/jira/browse/HBASE-5311
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>         Attachments: InternallyLayeredMap.java
>
>
> Just like we periodically compact the StoreFiles we should also periodically compact
the MemStore.
> During these compactions we eliminate deleted cells, expired cells, cells to removed
because of version count, etc, before we even do a memstore flush.
> Besides the optimization that we could get from this, it should also allow us to remove
the special handling of ICV, Increment, and Append (all of which use upsert logic to avoid
accumulating excessive cells in the Memstore).
> Not targeting this.

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