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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1771) PE sequentialWrite is 7x slower because of MemStoreFlusher#checkStoreFileCount
Date Mon, 17 Aug 2009 23:32:14 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jonathan Gray updated HBASE-1771:

    Attachment: HBASE-1771-v1.patch

Exposes two config parameters into hbase-default.xml (these were already being read in but
were defaulting too low).  Set at 7 as default (3 is default compaction threshold where we
actually trigger compaction in the first place, so means we can take on 4 more flushes while
waiting for compaction / before blocking).

    If more than this number of StoreFiles in any one Store
    (one StoreFile is written per flush of MemStore) then updates are
    blocked for this HRegion until a compaction is completed, or
    until hbase.hstore.blockingWaitTime has been exceeded.
    The time an HRegion will block updates for after hitting the StoreFile
    limit defined by hbase.hstore.blockingStoreFiles.
    After this time has elapsed, the HRegion will stop blocking updates even
    if a compaction has not been completed.  Default: 90 seconds.

> PE sequentialWrite is 7x slower because of MemStoreFlusher#checkStoreFileCount
> ------------------------------------------------------------------------------
>                 Key: HBASE-1771
>                 URL: https://issues.apache.org/jira/browse/HBASE-1771
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>         Attachments: HBASE-1771-v1.patch

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