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https://issues.apache.org/jira/browse/HBASE-20786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16604843#comment-16604843
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Mike Drob commented on HBASE-20786:
-----------------------------------
I think the only thing to do here is maybe increase the executor core pool
size. The list of futures is already async and will be operating in background
threads, looping through them serially isn't going to take noticeably longer
than trying to parallelize this.
Do you see 5 threads named 'region-location-(1-5)' in your jstack? what are
they doing?
> Table create with thousands of regions takes too long
> -----------------------------------------------------
>
> Key: HBASE-20786
> URL: https://issues.apache.org/jira/browse/HBASE-20786
> Project: HBase
> Issue Type: Sub-task
> Components: Performance
> Reporter: stack
> Priority: Major
>
> Internal testing has create of a table with 33k regions taking 18 minutes.
> Let me provide more info below. We have an executor with default ten threads
> handling the creation of the regions in HDFS which helps distribute out the
> load but its not enough. This cluster had >600 servers. Let me add detail.
> Need to spend some time on speeding up create/assigns. Made this an umbrella
> issue so can pick off pieces of the problem as subtasks.
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