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https://issues.apache.org/jira/browse/HBASE-555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584302#action_12584302
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Jim Kellerman commented on HBASE-555:
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Reviewed new patch. +1
> Only one Worker in HRS; on startup, if assigned tens of regions, havoc of
> reassignments because open processing is done in series
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-555
> URL: https://issues.apache.org/jira/browse/HBASE-555
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.16.0, 0.2.0, 0.1.0
> Reporter: stack
> Assignee: stack
> Priority: Blocker
> Attachments: 555-0.1-v2.patch, 555-0.1.patch
>
>
> On the Lars clusters, he's up into the thousands of regions. Starting this
> cluster, there is a load of churn in the master log as we assign regions,
> they report their opening and then after the hbase.hbasemaster.maxregionopen
> of one minute elapses, we assign the region elsewhere.
> Problem seems to be the fact that we only run a single Worker thread in our
> regionserver; means that region opens are processed in series.
> For example, the below shows when a master assigned a region and then the
> regionserver side log when it got around to opening it:
> {code}
> 2008-03-29 04:48:51,638 INFO org.apache.hadoop.hbase.HMaster: assigning
> region pdc-docs,US20060158177_20060720,1205765009844 to server
> 192.168.105.19:60020
> ..
> 2008-03-29 04:50:58,124 INFO org.apache.hadoop.hbase.HRegionServer:
> MSG_REGION_OPEN : pdc-docs,US20060158177_20060720,1205765009844
> {code}
> There is > 2 minutes between the two loggings (I checked clocks on this
> cluster and they are synced).
> Looking in the regionserver log, its just filled with logging on the opening
> of regions. The region opens are running pretty fast at about a second each
> but there are hundreds of regions to open in this case so its easy to go over
> our default of 60 seconds.
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