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https://issues.apache.org/jira/browse/HBASE-513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-513.
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Resolution: Won't Fix
We don't do mapfiles any more. Hfile indices are much smaller. Resovling as
invalid.
> Store Mapfile indexes in soft references
> ----------------------------------------
>
> Key: HBASE-513
> URL: https://issues.apache.org/jira/browse/HBASE-513
> Project: Hadoop HBase
> Issue Type: Sub-task
> Reporter: Bryan Duxbury
>
> One of the potentially big consumers of memory in the region server is the
> mapfile indexes we keep cached for fast access. Rather than building a
> complex system to try and LRU them ourself, we should use some form of
> SoftReference or derivative to keep the index around. That way, when our
> server gets near its memory limit, those indexes will be cleaned up
> automatically, making room.
> We would also have to code our accesses of Mapfile in such a way that if a
> index had been garbage collected, we were able to fetch it again from disk
> with a minimum of trouble.
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