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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-823) Concurrent "open mapfile reader" limit
Date Mon, 05 Apr 2010 17:01:27 GMT

     [ https://issues.apache.org/jira/browse/HBASE-823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack resolved HBASE-823.

    Resolution: Won't Fix

This issue has gone stale.  We no longerr use MapFiles and while we should probably bound
the set of HFiles open in the regionserver, the number of concurrent open resources has come
down a good bit since this issue was opened and we'll likely go other routes to conserve datanode
resource usage (nio) before we put back an upper limit on hfiles open.

> Concurrent "open mapfile reader" limit
> --------------------------------------
>                 Key: HBASE-823
>                 URL: https://issues.apache.org/jira/browse/HBASE-823
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
> Over in HBASE-745, Luo Ning profiling found that the number of open Readers has direct
impact on memory used.  This issue is about putting an upper bound on the number of open Readers
doing something like a bounded pool w/ a LRU eviction policy.

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