He Tianyi created YARN-6101:
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Summary: Delay scheduling for node resource balance
Key: YARN-6101
URL: https://issues.apache.org/jira/browse/YARN-6101
Project: Hadoop YARN
Issue Type: Improvement
Components: fairscheduler
Reporter: He Tianyi
Priority: Minor
We observed that, in today's cluster, usage of Spark has dramatically
increased.
This introduced a new issue that CPU/MEM utilization for single node may become
imbalanced due to Spark is generally more memory intensive. For example, after
a node with capability (48 cores, 192 GB memory) cannot satisfy a (1 core, 2 GB
memory) request if current used resource is (20 cores, 190 GB memory), with
plenty of total available resource across the whole cluster.
A thought for avoiding the situation is to introduce some strategy during
scheduling.
This JIRA proposes a delay-scheduling-alike approach to achieve better balance
between different type of resources on each node.
The basic idea is consider dominant resource for each node, and when a
scheduling opportunity on a particular node is offered to a resource request,
better make sure the allocation is changing dominant resource of the node, or,
in worst case, allocate at once when number of offered scheduling opportunities
exceeds a certain number.
With YARN SLS and a simulation file with hybrid workload (MR+Spark), the
approach improved cluster resource usage by nearly 5%. And after deployed to
production, we observed a 8% improvement.
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