Gen Luo created FLINK-28240:
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Summary:
NettyShuffleMetricFactory#RequestedMemoryUsageMetric#getValue may throw
ArithmeticException when the total segments of NetworkBufferPool is 0
Key: FLINK-28240
URL: https://issues.apache.org/jira/browse/FLINK-28240
Project: Flink
Issue Type: Bug
Components: Runtime / Network
Affects Versions: 1.15.0
Reporter: Gen Luo
In a single vertex job, the network memory can be set to 0 since the job
doesn't need it, and in this case the totalNumberOfMemorySegments of the
NetworkBufferPool will also be 0.
While the NettyShuffleMetricFactory#RequestedMemoryUsageMetric#getValue uses
the totalNumberOfMemorySegments of NetworkBufferPool as divisor without
validating, so an ArithmeticException will be thrown when the
totalNumberOfMemorySegments is 0.
Since 0 network memory is in fact valid for a single vertex job, I suppose the
RequestedMemoryUsageMetric#getValue should check if the devisor is 0, and
return 0 as the usage directly in such cases.
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