GitHub user vjagadish1989 opened a pull request:
https://github.com/apache/samza/pull/211
SAMZA-1271: Guarantee predictable, deterministic order for operator
initialization and finalization
Currently, the order of initialization of operators in the Samza high level
API is not deterministic. The non-determinism arises from two primary causes:
- No fixed order of iteration for all subscribed `OperatorSpec`s for a
given `MessageStream`
- No fixed order of iteration for all the `OperatorImpl`s in the
`OperatorImplGraph`
We aim to provide the following 2 guarantees in this patch:
For any 2 operators A, B in the graph, if B consumes the output of A:
- A is initialized before B is initialized
- A is finalized only after B is finalized
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vjagadish1989/samza deterministic_order
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/samza/pull/211.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #211
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commit 95dde24595702748ac4d448fb528a3c3bb8c43da
Author: vjagadish1989 <[email protected]>
Date: 2017-06-02T07:29:03Z
Guarantee deterministic order for operator initialization and finalization
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