Parallelize load of .regioninfo files in diagnostic/repair portion of hbck.
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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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