Yuzhao Chen created STORM-3093:
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Summary: Cache the storm id to executors mapping on master to
avoid repeat computation
Key: STORM-3093
URL: https://issues.apache.org/jira/browse/STORM-3093
Project: Apache Storm
Issue Type: Improvement
Components: storm-server
Affects Versions: 2.0.0
Reporter: Yuzhao Chen
Assignee: Yuzhao Chen
Fix For: 2.0.0
Now nimbus will collect all the topologies's conf/topology-ser/storm-base to
compute in a scheduling round, which is a very heavy work. The scheduling will
still take to minutes even we now change to PRC heartbeats and assignment
distribution.
So i decide to redesign the scheduler, so we can only schedule the topologies
that need to: that have dead workers or not enough number workers.
Here i checkout out the code and found that the id->executors mapping is
computed every time for every topology, which is really a heavy computation and
totally not that necessary, because this mapping is fixed invariable for a
topology unless we rebalance or kill it.
So i refactor the code a little here, and this is more powerful after the
scheduler is resigned for delta-scheduling[ which is very lightweight even
there are thousands of topologies on one cluster.]
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