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From "Demai Ni (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11617) AgeOfLastAppliedOp in MetricsSink got increased when no new replication sink OP
Date Wed, 30 Jul 2014 18:12:39 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Demai Ni updated HBASE-11617:
-----------------------------

    Environment:     (was: AgeOfLastAppliedOp in MetricsSink.java is to indicate the time
an edit sat in the 'replication queue' before it got replicated(aka applied)
{code}

  /**
   * Set the age of the last applied operation
   *
   * @param timestamp The timestamp of the last operation applied.
   * @return the age that was set
   */
  public long setAgeOfLastAppliedOp(long timestamp) {
    lastTimestampForAge = timestamp;
    long age = System.currentTimeMillis() - lastTimestampForAge;
    rms.setGauge(SINK_AGE_OF_LAST_APPLIED_OP, age);
    return age;
  } 
{code}
In the following scenario:
1) at 7:00am a sink op is applied, and the SINK_AGE_OF_LAST_APPLIED_OP is
set for example 100ms;
2) and then NO new Sink op occur.
3) when a refreshAgeOfLastAppliedOp() is invoked at 8:00am. Instead of
return the 100ms, the AgeOfLastAppliedOp become 1hour + 100ms, 

It was because that refreshAgeOfLastAppliedOp() get invoked periodically by getStats(). 

proposed fix: 
{code}
....
    // a new value 
+   private long age; 
....
  public long setAgeOfLastAppliedOp(long timestamp) {
+ if (lastTimestampForAge != timestamp) {
    lastTimestampForAge = timestamp;
-   long age = System.currentTimeMillis() - lastTimestampForAge;
+    this.age = System.currentTimeMillis() - lastTimestampForAge;
    rms.setGauge(SINK_AGE_OF_LAST_APPLIED_OP, age);
}
    return age;
  }
{code}

detail discussion in [dev@hbase  | http://mail-archives.apache.org/mod_mbox/hbase-dev/201407.mbox/%3CCAOEq2C5BKMXAM2Fv4LGVb_Ktek-Pm%3DhjOi33gSHX-2qHqAou6w%40mail.gmail.com%3E
])

> AgeOfLastAppliedOp in MetricsSink got increased when no new replication sink OP 
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-11617
>                 URL: https://issues.apache.org/jira/browse/HBASE-11617
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 0.98.2
>            Reporter: Demai Ni
>            Assignee: Demai Ni
>            Priority: Minor
>             Fix For: 0.99.0, 0.98.5, 2.0.0
>
>




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