[jira] [Commented] (FLINK-6416) Potential divide by zero issue in InputGateMetrics#refreshAndGetAvg()

["Greg Hogan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-6416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989121#comment-15989121 ] 

Greg Hogan commented on FLINK-6416:
-----------------------------------

Wouldn't this produce {{NaN}}?

> Potential divide by zero issue in InputGateMetrics#refreshAndGetAvg()
> ---------------------------------------------------------------------
>
>                 Key: FLINK-6416
>                 URL: https://issues.apache.org/jira/browse/FLINK-6416
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Priority: Minor
>
> {code}
>     int count = 0;
>     for (InputChannel channel : inputGate.getInputChannels().values()) {
>       if (channel instanceof RemoteInputChannel) {
>         RemoteInputChannel rc = (RemoteInputChannel) channel;
>         int size = rc.unsynchronizedGetNumberOfQueuedBuffers();
>         total += size;
>         ++count;
>       }
>     }
>     return total / (float) count;
> {code}
> If count is zero at the end of the loop, the division would produce exception.



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