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https://issues.apache.org/jira/browse/HBASE-5913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267178#comment-13267178
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stack commented on HBASE-5913:
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+1 on patch
> Speed up the full scan of META
> ------------------------------
>
> Key: HBASE-5913
> URL: https://issues.apache.org/jira/browse/HBASE-5913
> Project: HBase
> Issue Type: Improvement
> Reporter: chunhui shen
> Assignee: chunhui shen
> Fix For: 0.96.0, 0.94.1
>
> Attachments: 5913-v2.txt, HBASE-5913.patch
>
>
> In the master, we will do the full scan of META in some situations
> for example,
> 1.master start up
> 2.CatalogJanitor do the full scan per 5 mins
> 3.ServerShutdownHandler, getServerUserRegions for dead server.
> For the online applications, we should try the best to reduce the process
> time of ServerShutdownHandler in the situation 3.
> However, we found MetaReader#getServerUserRegions take 14mins for 10w regions
> in our production environment.
> And it is caused by two reasons:
> The first, we don't use cache and get one row per next() when fully scan
> .META.
> The second, "hbase.ipc.client.tcpnodelay" is false as default, and in our
> environment it take 40ms for per next() (It is related to the length of row
> in the .META. , if someone also found, could try to set it true)
> For this issue, I think we could set the caching when do the full scan of META
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