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https://issues.apache.org/jira/browse/HBASE-20786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16523886#comment-16523886
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Andrew Purtell commented on HBASE-20786:
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bq. An advantage of separate pools is that tasks are less likely to be starved
out.
The disadvantage of separate pools is difficulty in operation due to
inflexibility when faced with changing conditions and workloads.
> 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: Umbrella
> 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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