[ https://issues.apache.org/jira/browse/MAPREDUCE-1683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866506#action_12866506 ]
Amareshwari Sriramadasu commented on MAPREDUCE-1683: ---------------------------------------------------- Patch functionally looks fine. But lets wait for the resolution of MAPREDUCE-1779 before this. > 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 > Assignee: Luke Lu > Fix For: 0.22.0 > > Attachments: MAPREDUCE-1683_part2_yhadoop_20_10.patch, > MAPREDUCE-1683_yhadoop_20_9.patch, MAPREDUCE-1683_yhadoop_20_S.patch, > mr-1683-trunk-v1.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. - You can reply to this email to add a comment to the issue online.