jiajunwang commented on pull request #1123:
URL: https://github.com/apache/helix/pull/1123#issuecomment-652017384
Whichever wins is fine. Since the next pipeline running will take the cached
result and keep calculating based on there.
* If A wins, then A keeps calculating based on its local state.
* If B wins, then because A cache the result after write, it will still
calculate based on its local state. And the next pipeline will overwrite B's
output. And we are good.
In this case, we don't really need B's result.
Cheers,
-Jiajun
________________________________
From: kaisun2000 <[email protected]>
Sent: Tuesday, June 30, 2020 1:07 PM
To: apache/helix <[email protected]>
Cc: Jiajun Wang <[email protected]>; Author <[email protected]>
Subject: Re: [apache/helix] Cleanup the persisted assignment state if no
resource is on WAGED rebalancer. (#1123)
Please note that we have an MVCC implemented in the bucket accessor to
ensure cross node consistency.
I will try to examine the bucket accessor a little bit more carefully. Here
is the question:
Say controller A is for resource R allocation. Then controller A session
expires, controller B take care of resource B. Later when A is back, for a
while A and B would run at the same time. When serializing say baseline for
resource R, A wins over B, is it going to be a problem for this resource as B
would later be controller for R.
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