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https://issues.apache.org/jira/browse/MAPREDUCE-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14132997#comment-14132997
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Gera Shegalov commented on MAPREDUCE-5954:
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Sorry for confusing term. Replace job by monitoring tool (old Pig, Hive shells,
straight JobClient) in the above, wanting to take advantage of the new
server-side feature.
> Optional exclusion of counters from getTaskReports
> --------------------------------------------------
>
> Key: MAPREDUCE-5954
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5954
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Maysam Yabandeh
> Assignee: Maysam Yabandeh
> Attachments: MAPREDUCE-5954.patch
>
>
> MRClientService#getTaskReports returns the set of map or reduce tasks along
> with their counters, which are quite large. For big jobs, the response could
> be as large as 0.5 GB. This has a negative impact both on MRAppMaster and the
> monitoring tool that invokes getTaskReports. This problem has led Pig users
> to entirely disable getTaskReports for big jobs:
> https://issues.apache.org/jira/browse/PIG-4043
> Many monitoring tools, including ours, do not need the task counters when
> invoking getTaskReports. Pig also does not make any use of task counters.
> Here are the usages of Tasks in pig:
> {code}
> protected void getErrorMessages(TaskReport reports[], String type,
> String msgs[] = reports[i].getDiagnostics();
> if (HadoopShims.isJobFailed(reports[i])) {
> {code}
> and
> {code}
> protected long computeTimeSpent(TaskReport[] taskReports) {
> long timeSpent = 0;
> for (TaskReport r : taskReports) {
> timeSpent += (r.getFinishTime() - r.getStartTime());
> }
> return timeSpent;
> }
> {code}
> GetTaskReportsRequest can be augmented with an optional boolean with which
> the monitoring tool can request excluding the counters form the response.
> This minor change is very simple and yet makes many existing monitoring tools
> more efficient.
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