[
https://issues.apache.org/jira/browse/HBASE-11617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Demai Ni updated HBASE-11617:
-----------------------------
Description:
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);
+ } else {
+ this.age = 0; // no new Sink OP coming. the last one already applied
+ }
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
]
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
>
>
> 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);
> + } else {
> + this.age = 0; // no new Sink OP coming. the last one already applied
> + }
> 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
> ]
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