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From "Sergey Soldatov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11839) TestRegionRebalance is flakey
Date Tue, 09 Sep 2014 15:11:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Soldatov updated HBASE-11839:
------------------------------------
    Attachment: HBASE-11839-v1.patch

Quite simple patch. The problem is that average load calculated using both online and dead
servers. An example:
25 regions on 3 region servers with 9, 9, 7 regions correspondingly. 3rd is going down and
its regions randomly copied to other regions, so, for example, it become as 15,10 and 3rd
server which is down is still having 7. Current code calculated average as (15 + 10 + 7)/3
= 10.6 and this value is used during computation instead of 12.5 (25 regions and 2 online
servers). 
Patch uses only online servers during average computation. 

Please correct me if I wrong.  

> TestRegionRebalance is flakey
> -----------------------------
>
>                 Key: HBASE-11839
>                 URL: https://issues.apache.org/jira/browse/HBASE-11839
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Alex Newman
>            Assignee: Alex Newman
>             Fix For: 2.0.0, 0.99.1
>
>         Attachments: HBASE-11839-v1.patch
>
>
> Besides failing many times on the prebuild TestRegionRebalance fails on my local machine
eventually simply with
> export RUNNIN=true; mvn clean install -DskipTests ; while ($RUNNIN) ; do mvn test -Dtest=TestRegionRebalancing
|| RUNNIN=false;done



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