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From "Jonathan Hsieh (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5712) Parallelize load of .regioninfo files in diagnostic/repair portion of hbck.
Date Wed, 04 Apr 2012 13:51:23 GMT
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
            Reporter: 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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