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Posted to commits@samza.apache.org by "Sanil Jain (Confluence)" <no...@apache.org> on 2020/06/01 16:30:00 UTC
[CONF] Apache Samza > SEP-22: Container Placements in Samza
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[SEP-22: Container Placements in
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# **Status**
**Current state** : ** ** [ UNDER DISCUSSION ]ACCEPTED
**Discussion thread** : <http://mail-archives.apache.org/mod_mbox/samza-
dev/202001.mbox/browser> _
_
**JIRA** : [SAMZA-2373](https://issues.apache.org/jira/browse/SAMZA-2373)
**Released: TBDSamza 1.5**
# **Problem**
Samza operates in a multi-tenant environment with cluster managers like
[Yarn](https://samza.apache.org/learn/documentation/latest/deployment/deployment-
model.html) and Mesos where a single host can run multiple Samza containers.
Often due to soft limits configured for cluster managers like Yarn and no
notion of dynamic workload balancing in Samza a host lands in a situation
where it is underperforming and it is desired to move one or more containers
from that host to other hosts. Today this is not possible without affecting
other jobs on the hot host or restarting the affected job manually. In other
use cases like resetting
[checkpoints](https://samza.apache.org/learn/documentation/latest/container/checkpointing.html)
of a single container or supporting canary or rolling bounces the ability to
restart a single or a subset of containers without restarting the whole job is
highly desirable.
...
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