[jira] [Created] (YARN-5169) most of YARN events have timestamp of -1

["Sangjin Lee (JIRA)" <ji...@apache.org>]

Sangjin Lee created YARN-5169:
---------------------------------

             Summary: most of YARN events have timestamp of -1
                 Key: YARN-5169
                 URL: https://issues.apache.org/jira/browse/YARN-5169
             Project: Hadoop YARN
          Issue Type: Bug
          Components: yarn
    Affects Versions: 2.7.2
            Reporter: Sangjin Lee


Most of the YARN events (subclasses of {{AbstractEvent}}) have timestamp of -1. {{AbstractEvent}} have two constructors, one that initializes the timestamp to -1 and the other to the caller-provided value. But most events use the former (thus timestamp of -1).

Some of the more common events, including {{ApplicationEvent}}, {{ContainerEvent}}, {{JobEvent}}, etc. do not set the timestamp.

The rationale for this behavior seems to be mentioned in {{AbstractEvent}}:
{code}
  // use this if you DON'T care about the timestamp
  public AbstractEvent(TYPE type) {
    this.type = type;
    // We're not generating a real timestamp here.  It's too expensive.
    timestamp = -1L;
  }
{code}

This absence of the timestamp isn't really visible in many cases and therefore may have gone unnoticed, but the timeline service exposes this problem very visibly.



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