[HBASE-5712] Parallelize load of .regioninfo files in diagnostic/repair portion of hbck.

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.90.7, 0.92.2, 0.94.0, 0.95.2
• Fix Version/s: 0.94.0, 0.95.0
• Component/s: hbck
• Hadoop Flags: Reviewed
• Assignee: Jonathan Hsieh
• Reporter: Jonathan Hsieh
• Created: 04/Apr/12 13:49
• Updated: 26/Feb/13 08:12
• Resolved: 30/Apr/12 06:34

Description

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..

Issue Links

• relates to: HBASE-5628 Improve performance of uberhbck