nkeywal created HBASE-7271:
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Summary: Have a single executor for all zkWorkers in the
assignment manager
Key: HBASE-7271
URL: https://issues.apache.org/jira/browse/HBASE-7271
Project: HBase
Issue Type: Bug
Components: master, Region Assignment
Affects Versions: 0.96.0
Reporter: nkeywal
Assignee: nkeywal
Fix For: 0.96.0
The current strategy is to have an array of monothreaded executor, and hash the
zk path to ensure that there are no two events on the same region executed in
parallel
I think a single executor, as presented in the attached patch, is better
because:
- we're guaranteed to use all threads at any time
- if managing one of the event takes longer that expected, the slowness is
limited to this region, and not to all regions that have the same
hashed/moduloed code
- For the nodeChildrenChanged, there is no need to choose randomly one of the
worker (or, once again, the risk to get stuck if one of the event takes time to
be managed).
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