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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (GEODE-2676) RegionMBean statistics wrong on partitioned regions
Date Thu, 16 Nov 2017 00:38:00 GMT


ASF GitHub Bot commented on GEODE-2676:

jinmeiliao commented on a change in pull request #1063: GEODE-2676: fix NPE with ShowMetricsCommand.

 File path: geode-core/src/main/java/org/apache/geode/management/internal/beans/
 @@ -145,6 +145,13 @@ protected RegionMBeanBridge(Region<K, V> region) {
     this.regAttrs = region.getAttributes();
     this.isStatisticsEnabled = regAttrs.getStatisticsEnabled();
+    if (isStatisticsEnabled) {
 Review comment:
   I think the reason for exception thrown is that PartitionedRegion does not implement getStatistics
call. This is code that throws that exception:
     public CacheStatistics getStatistics() {
       throw new UnsupportedOperationException();

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> RegionMBean statistics wrong on partitioned regions
> ---------------------------------------------------
>                 Key: GEODE-2676
>                 URL:
>             Project: Geode
>          Issue Type: Bug
>          Components: management
>            Reporter: Fred Krone
>            Priority: Minor
>              Labels: jmx
> RegionMBean attributes hitCount, hitRatio, missCount, lastAccessedTime, and lastModifiedTime
will always be 0 for an mbean that represents an partitioned region.
> The gettors for these methods may call getStatistics() which on a PR always throws UnsupportedOperationException.
So this exception might even get exposed to customers.
> The initialization of RegionMBeanBridge calls getStatisticsEnabled() which returns true
on a PartitionedRegion. This does have meaning on a PR but it does not mean that getStatistics()
is a supported operation. On a PR setting statistics-enabled causes each region-entry to also
keep track of its last access time.
> It is true that if getStatisticsEnabled() is false then you should not call getStatistics.
But the opposite is not true. Since we currently have regions that do not support getStatistics(),
the code in RegionMBeanBridge should catch UnsupportedOperationException and handle it. I
would suggest that the constructor be changed that initializes the "isStatisticsEnabled" field.
Instead of only calling getStatisticsEnabled() it should also call getStatistics(). Something
like this:
> {noformat}
>     {
>       boolean useGetStatistics = regAttrs.getStatisticsEnabled();
>       if (useGetStatistics) {
>         try {
>           region.getStatistics();
>         } catch (UnsupportedOperationException ex) {
>           useGetStatistics = false;
>         }
>       }
>       this.isStatisticsEnabled = useGetStatistics;
>     }
> {noformat}
> That way in a future release if PRs are changed to support getStatistics this code will
start calling it without having a direct dependency on the implementation of PartitionedRegion.
> is a request to support getStatistics
on PRs.

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