[ https://issues.apache.org/jira/browse/MAPREDUCE-1683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855540#action_12855540 ]
Vinod K V commented on MAPREDUCE-1683: -------------------------------------- +1 for leaving the memory vals in the detailed info. Patch for 20 looks good too. When working on the trunk patch, we should cleanup/remove all the useless constructors - constructors are all package private so no harm in doing a cleanup here, I think. > Remove JNI calls from ClusterStatus cstr > ---------------------------------------- > > Key: MAPREDUCE-1683 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-1683 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: jobtracker > Affects Versions: 0.20.2 > Reporter: Chris Douglas > Attachments: MAPREDUCE-1683_yhadoop_20_9.patch > > > The {{ClusterStatus}} constructor makes two JNI calls to the {{Runtime}} to > fetch memory information. {{ClusterStatus}} instances are often created > inside the {{JobTracker}} to obtain other, unrelated metrics (sometimes from > schedulers' inner loops). Given that this information is related to the > {{JobTracker}} process and not the cluster, the metrics are also available > via {{JvmMetrics}}, and the jsps can gather this information for themselves: > these fields can be removed from {{ClusterStatus}} -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira