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https://issues.apache.org/jira/browse/GEODE-2676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254480#comment-16254480
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ASF GitHub Bot commented on GEODE-2676:
---------------------------------------
pdxrunner commented on a change in pull request #1063: GEODE-2676: fix NPE with
ShowMetricsCommand.
URL: https://github.com/apache/geode/pull/1063#discussion_r151288029
##########
File path:
geode-core/src/main/java/org/apache/geode/management/internal/beans/RegionMBeanBridge.java
##########
@@ -145,6 +145,13 @@ protected RegionMBeanBridge(Region<K, V> region) {
this.regAttrs = region.getAttributes();
this.isStatisticsEnabled = regAttrs.getStatisticsEnabled();
+ if (isStatisticsEnabled) {
Review comment:
I don't like this suggestion. I think it's bad practice to dig down into the
internals of the object to look for particular behavior - let the object tell
you what the behavior is.
I would leave the try/catch as it is.
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> RegionMBean statistics wrong on partitioned regions
> ---------------------------------------------------
>
> Key: GEODE-2676
> URL: https://issues.apache.org/jira/browse/GEODE-2676
> 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.
> https://issues.apache.org/jira/browse/GEODE-2685 is a request to support
> getStatistics on PRs.
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