nkeywal created HBASE-5998:
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Summary: 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
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
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