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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).

{code}
  <property>
    <name>hbase.hstore.blockingStoreFiles</name>
    <value>7</value>
    <description>
    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.
    </description>
  </property>
  <property>
    <name>hbase.hstore.blockingWaitTime</name>
    <value>90000</value>
    <description>
    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.
    </description>
  </property>
{code}

> 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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