nkeywal created HBASE-7247:
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Summary: Assignment performances decreased by 50% because of
regionserver.OpenRegionHandler#tickleOpening
Key: HBASE-7247
URL: https://issues.apache.org/jira/browse/HBASE-7247
Project: HBase
Issue Type: Improvement
Components: master, Region Assignment, regionserver
Affects Versions: 0.96.0
Reporter: nkeywal
Assignee: nkeywal
Priority: Critical
The regionserver.OpenRegionHandler#tickleOpening updates the region znode as
"Do this so master doesn't timeout this region-in-transition.".
However, on the usual test, this makes the assignment time of 1500 regions goes
from 70s to 100s, that is, we're 50% slower because of this.
More generally, ZooKeper commits to disk all the data update, and this takes
time. Using it to provide a keep alive seems overkill. At the very list, it
could be made asynchronous.
I'm not sure how necessary these updates are required (I need to go deeper in
the internal, feedback welcome), but it seems very important to optimize
this... The trival fix would be to make this optional.
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