[jira] [Created] (ACCUMULO-3330) Tserver "Running low on memory" might be miscomputed

["Jonathan Park (JIRA)" <ji...@apache.org>]

Jonathan Park created ACCUMULO-3330:
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             Summary: Tserver "Running low on memory" might be miscomputed
                 Key: ACCUMULO-3330
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3330
             Project: Accumulo
          Issue Type: Bug
            Reporter: Jonathan Park
            Priority: Minor


I'm not sure if this is JVM specific behavior, but I suspect the way we compute when to log "Running low on memory" could be improved. 

Currently we use {{Runtime.getRuntime()}} and rely on the formula {{freeMemory() < maxMemory() * 0.05}} to determine whether or not to log the warning. With Oracle's HotSpot VM, {{freeMemory()}} appears to return the amount of free memory relative to the current JVM heap size (as returned by {{totalMemory()}}. If {{totalMemory()}} != {{maxMemory()}} then this warning will start appearing before I think it was intended to which is misleading.

Easiest workaround is to configure the JVM heap to have the min size = max size.



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