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https://issues.apache.org/jira/browse/FLINK-28240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17562407#comment-17562407
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Yun Gao commented on FLINK-28240:
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Merged on master via c6b3a8aa25607fb62d51b92f11f72778e5d618b2
Merged on 1.15 via 95f4b6fc7fd4a713d8d6348d32a121498ffce1e2
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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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