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From "Raghu Angadi (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5311) Allow inmemory Memstore compactions
Date Wed, 08 Feb 2012 22:45:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204074#comment-13204074
] 

Raghu Angadi commented on HBASE-5311:
-------------------------------------

yeah, theoretically stale values are expected any way. And at higher layer memstore might
allow only one accessor for a key.
                
> 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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