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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1143) region count erratic in master UI (kill server hosting root or meta and see how count goes awry).... make sure you have a bunch of reions in there
Date Wed, 03 Jun 2009 19:27:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716036#action_12716036
] 

Jean-Daniel Cryans commented on HBASE-1143:
-------------------------------------------

I tried different values for the memcache max size. Between each test of randomWrite 4 on
a single node (cluster wasn't available), I did a shutdown of HBase + deleted the directory
in HDFS. Here are the results:

8k memcache first try
ELAPSED_TIME=423519

second try
ELAPSED_TIME=405319

16k memcache first try
ELAPSED_TIME=437552

second try
ELAPSED_TIME=444659

1M memcache first try
ELAPSED_TIME=423519

second try
ELAPSED_TIME=432052

12M memcache first try
ELAPSED_TIME=450118

second try
ELAPSED_TIME=428693

I did also try with 1k memcache but it was complete nonsense since it was flushing every 5
seconds. I think a sane value would be 12k so we get to flush more often but not too much.
Could make this configurable.

> region count erratic in master UI (kill server hosting root or meta and see how count
goes awry).... make sure you have a bunch of reions in there
> --------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1143
>                 URL: https://issues.apache.org/jira/browse/HBASE-1143
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.20.0
>
>


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