Peter D Kirchner created YARN-3020:
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Summary: n similar addContainerRequest()s produce n*(n+1)/2
containers
Key: YARN-3020
URL: https://issues.apache.org/jira/browse/YARN-3020
Project: Hadoop YARN
Issue Type: Bug
Components: client
Affects Versions: 2.5.2, 2.5.1, 2.6.0, 2.5.0
Reporter: Peter D Kirchner
BUG: If the application master calls addContainerRequest() n times, but with
the same priority, I get 1+2+3+...+n containers = n*(n+1)/2 .
If the application master calls addContainerRequest() n times, but with a
unique priority each time, I get n containers (as I intended).
Analysis:
There is a logic problem in AMRMClientImpl.java.
Although AMRMClientImpl.java, allocate() does an ask.clear() , on subsequent
calls to addContainerRequest(), addResourceRequest() finds the previous
matching remoteRequest and increments the container count rather than starting
anew, and does an addResourceRequestToAsk() which defeats the ask.clear().
>From documentation and code comments, it was hard for me to discern the
>intended behavior of the API, but the inconsistency reported in this issue
>suggests one case or the other is implemented incorrectly.
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