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https://issues.apache.org/jira/browse/HBASE-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656475#action_12656475
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stack commented on HBASE-1062:
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+1 on it being critical. Powerset has a cluster of ~5000 regions. Start-up is
a big-bang but steady-state happens eventually. I haven't done much study of
it. I can imagine that indeed if cluster went down bad with a few major
compactions in the mix, startup could be messy. How many regionservers Andrew?
And a HRS beside each datanode? (Our nodes are relatively lightly-loaded --
50 or so regions in 2G heaps).
> Compactions at (re)start on a large table can overwhelm DFS
> -----------------------------------------------------------
>
> Key: HBASE-1062
> URL: https://issues.apache.org/jira/browse/HBASE-1062
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Priority: Critical
> Fix For: 0.20.0
>
>
> Given a large table, > 1000 regions for example, if a cluster restart is
> necessary, the compactions undertaken by the regionservers when the master
> makes initial region assignments can overwhelm DFS, leading to file errors
> and data loss. This condition is exacerbated if write load was heavy before
> restart and so many regions want to split as soon as they are opened.
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