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From "Jonathan Hsieh (Assigned) (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-5712) Parallelize load of .regioninfo files in diagnostic/repair portion of hbck.
Date Wed, 04 Apr 2012 16:27:25 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Hsieh reassigned HBASE-5712:
-------------------------------------

    Assignee: Jonathan Hsieh
    
> Parallelize load of .regioninfo files in diagnostic/repair portion of hbck.
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-5712
>                 URL: https://issues.apache.org/jira/browse/HBASE-5712
>             Project: HBase
>          Issue Type: Sub-task
>          Components: hbck
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>
> On heavily loaded hdfs's some dfs nodes may not respond quickly and backs off for 60s
before attempting to read data from another datanode.  Portions of the information gathered
from hdfs (.regioninfo files) are loaded serially.  With HBase with clusters with 100's, or
1000's, or 10000's regions encountering these 60s delay blocks progress and can be very painful.
 
> There is already some parallelization of portions of the hdfs information load operations
and the goal here is move the reading of .regioninfos into the parallelized sections..

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