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From "Varun Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6720) Inconsistent values of counters across tasks and job reported to timeline service.
Date Mon, 20 Jun 2016 19:47:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340280#comment-15340280
] 

Varun Saxena commented on MAPREDUCE-6720:
-----------------------------------------

JSON output for the flow run :
{noformat}
{
  metrics: [
    {
      type: "SINGLE_VALUE",
      id: "org.apache.hadoop.mapreduce.FileSystemCounter:FILE_BYTES_WRITTEN",
      aggregationOp: "NOP",
      values: {
        1466278879296: 936018
      }
    }
  ],
  events: [ ],
  id: "root@sleep_flow/3000",
  type: "YARN_FLOW_RUN",
  createdtime: 1466278710216,
  info: {},
  isrelatedto: { },
  relatesto: { }
}
{noformat}

The JSON output for the 3 apps belonging to the flow run is :
{noformat}
[
  {
    metrics: [
      {
        type: "SINGLE_VALUE",
        id: "org.apache.hadoop.mapreduce.FileSystemCounter:FILE_BYTES_WRITTEN",
        aggregationOp: "NOP",
        values: {
          1466278879296: 312006
        }
      }
    ],
    events: [ ],
    id: "application_1466276553502_0006",
    type: "YARN_APPLICATION",
    createdtime: 1466278859013,
    info: {},
    configs: { },
    isrelatedto: { },
    relatesto: { }
  },
  {
    metrics: [
      {
        type: "SINGLE_VALUE",
        id: "org.apache.hadoop.mapreduce.FileSystemCounter:FILE_BYTES_WRITTEN",
        aggregationOp: "NOP",
        values: {
          1466278827458: 312006
        }
      }
    ],
    events: [ ],
    id: "application_1466276553502_0005",
    type: "YARN_APPLICATION",
    createdtime: 1466278806523,
    info: {},
    configs: { },
    isrelatedto: { },
    relatesto: { }
  },
  {
    metrics: [
      {
        type: "SINGLE_VALUE",
        id: "org.apache.hadoop.mapreduce.FileSystemCounter:FILE_BYTES_WRITTEN",
        aggregationOp: "NOP",
        values: {
          1466278730926: 312006
        }
      }
    ],
    events: [ ],
    id: "application_1466276553502_0004",
    type: "YARN_APPLICATION",
    createdtime: 1466278710216,
    info: {},
    configs: { },
    isrelatedto: { },
    relatesto: { }
  }
]
{noformat}

> Inconsistent values of counters across tasks and job reported to timeline service.
> ----------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6720
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6720
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: applicationmaster
>    Affects Versions: YARN-2928
>            Reporter: Varun Saxena
>
> While testing found below issue. For some of the task counters, we do not have consistent
values. This is not the case with every counter though.
> Consider the case of counter "org.apache.hadoop.mapreduce.FileSystemCounter:FILE_BYTES_WRITTEN".
> I found that its value for a flow I ran, was 936018 bytes. For the 3 apps associated
with this flow run, the values were 312006 bytes each (which equals to value for a flow run
i.e. 3 * 312006 = 936018). Drilling further down I found though that for one of the apps,
the 4 tasks(2 mappers and 2 reducers) had values as 155918 bytes each for the 2 reducers and
156003 bytes each for the 2 mappers.
> This means the value reported for the app should be (2 * 156003 + 2* 155918) or 623842
bytes but it is only 312006 bytes which indicates that only counter value of mappers is being
picked up.



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