Yuzhao Chen created STORM-2693:
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Summary: Topology submission or kill takes too much time when
topologies grow to a few hundred
Key: STORM-2693
URL: https://issues.apache.org/jira/browse/STORM-2693
Project: Apache Storm
Issue Type: Improvement
Components: storm-core
Affects Versions: 0.9.6, 1.0.2, 1.1.0, 1.0.3
Reporter: Yuzhao Chen
Fix For: 1.1.0
Attachments: 2FA30CD8-AF15-4352-992D-A67BD724E7FB.png,
D4A30D40-25D5-4ACF-9A96-252EBA9E6EF6.png
Now for a storm cluster with 40 hosts [with 32 cores and 128G mem] and hundreds
of topologies, nimbus submission and killing will take about minutes to finish.
For example, for a cluster with 300 hundred of topologies，it will take about 8
minutes to submit a topology, this affect our efficiency be seriously.
So, i check out the nimbus code and find two factor that will effect nimbus
submission/killing time for a scheduling round:
* read existing-assignments from zookeeper for every topology [will take about
4 seconds for a 300 topologies cluster]
* read all the workers heartbeats and update the state to nimbus cache [will
take about 30 seconds for a 300 topologies cluster]
the key here is that Storm now use zookeeper to aware heartbeats [not RPC], and
also keep physical plan [assignments] to zookeeper.
So, i think we should make some change to storm's heartbeats and assignments
management.
For assignment promotion:
1. nimbus will put the assignments in memory also cache a copy to
local disk
2. when restart or HA leader trigger nimbus will recover
assignments from disk
3. nimbus will tell supervisor its assignment every time scheduling
4. supervisor will sync assignments at fixed time
For heartbeats promotion:
1. workers will report executors ok or wrong to supervisor at fixed time
2. supervisor will report workers heartbeats to nimbus at fixed time
3. if supervisor die, it will tell nimbus through runtime hook
or let nimbus find it through aware supervisor if survive
4. let supervisor decide if worker is running ok or invalid , supervisor will
tell nimbus which executors of every topology are ok
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