[jira] [Created] (FLINK-7401) EnvironmentInformation.getMaxJvmHeapMemory does not return the value given via -Xmx

[Shang Yuanchun (Jira)]

Nico Kruber created FLINK-7401:
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             Summary: EnvironmentInformation.getMaxJvmHeapMemory does not return the value given via -Xmx
                 Key: FLINK-7401
                 URL: https://issues.apache.org/jira/browse/FLINK-7401
             Project: Flink
          Issue Type: Bug
          Components: Local Runtime
    Affects Versions: 1.3.2, 1.3.1, 1.2.1, 1.3.0, 1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.2.0, 1.1.0, 1.4.0
            Reporter: Nico Kruber
            Assignee: Nico Kruber


{{EnvironmentInformation.getMaxJvmHeapMemory}} is intended to return the value given to the JVM via {{-Xmx}} but it actually returns something a bit smaller which may disturb memory calculations expecting the right value.

For now, this is a "good" bug as the calculations inside {{TaskManagerServices#calculateNetworkBufferMemory()}}, for example, lead to lower values for the network buffers or the manages memory fractions which thus still fit into the bounds set by the JVM options.



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