Abhinaba Sarkar created YARN-10661:
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Summary: Add option to scale down specific containers in flex API
Key: YARN-10661
URL: https://issues.apache.org/jira/browse/YARN-10661
Project: Hadoop YARN
Issue Type: Improvement
Components: yarn
Reporter: Abhinaba Sarkar
We can flex the number of containers in yarn-service. But currently we do not
have option to specify which containers are to be scaled down. This is useful
in scaling down Hive LLAP clusters. For example -
{code:java}
2021-02-22 12:52:58,983 [IPC Server handler 0 on 24799] INFO
service.ClientAMService - Flexing component llap to 42021-02-22 12:52:58,983
[Component dispatcher] INFO component.Component - [FLEX DOWN COMPONENT llap]:
scaling down from 6 to 42021-02-22 12:52:58,984 [Component dispatcher] INFO
instance.ComponentInstance - [COMPINSTANCE llap-5 :
container_e02_1613896771789_0071_01_000007]: Flexed down by user,
destroying.2021-02-22 12:52:58,987 [Component dispatcher] INFO
instance.ComponentInstance - [COMPINSTANCE llap-4 :
container_e02_1613896771789_0071_01_000006]: Flexed down by user, destroying.
{code}
Last added containers are first ones to be destroyed. This might not be the
most optimal approach as we would like the least loaded(in terms of executors)
containers to be destroyed first. We propose an option to add the list of
containers that can be scaled down by flexing.
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