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ramkrishna.s.vasudevan commented on HBASE-5998: ----------------------------------------------- @Stack We have a backport version. We can submit it today. > Bulk assignment: regionserver optimization by using a temporary cache for > table descriptors when receveing an open regions request > ---------------------------------------------------------------------------------------------------------------------------------- > > Key: HBASE-5998 > URL: https://issues.apache.org/jira/browse/HBASE-5998 > Project: HBase > Issue Type: Improvement > Components: regionserver > Affects Versions: 0.96.0 > Reporter: nkeywal > Assignee: nkeywal > Priority: Minor > Fix For: 0.96.0 > > Attachments: 5998.v2.patch, 5998.v3.patch > > > During the assignment, on the regionserver, before creating the handlers we > load the table description. Even if there is a cache, we check the timestamps > for each region, while it's not necessary. The test below is just with one > node, with more nodes the benefit will improve. By limiting the time spent in > HRegion#openRegion we increase the parallelization during cluster startup, as > the master is using a pool of threads to call the RS. > -- Without the fix > 2012-05-14 11:40:52,501 DEBUG > org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning 1193 > region(s) to localhost,11003,1336988444043 > 2012-05-14 11:41:09,947 DEBUG > org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning done for > localhost,11003,1336988444043 > -- With the fix > 2012-05-14 11:34:40,444 DEBUG > org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning 1193 > region(s) to localhost,11003,1336988444043 > 2012-05-14 11:34:40,929 DEBUG > org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning done for > localhost,11003,1336988065948 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira