[jira] [Updated] (HBASE-5913) Speed up the full scan of META

["chunhui shen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-5913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

chunhui shen updated HBASE-5913:
--------------------------------

    Attachment: HBASE-5913.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
>         Attachments: 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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