Yakov Kopel created TS-1631:
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Summary: Clear Stats doesn't work - old value return
Key: TS-1631
URL: https://issues.apache.org/jira/browse/TS-1631
Project: Traffic Server
Issue Type: Bug
Components: Core, Management API
Reporter: Yakov Kopel
I’m trying to clear stats using traffic_line -c/-C and it doesn’t appear to
work. After a couple of seconds the old values return.
CLI sample output:
traffic_line -r proxy.process.http.total_client_connections_ipv4
208
traffic_line -c
traffic_line -r proxy.process.http.total_client_connections_ipv4
0
traffic_line -r proxy.process.http.total_client_connections_ipv4
210
I think this is due to not updating the sum/count in the net-threads.
When traffic_line -c/-C is called - it clear the records table but not the
net-threads sum/count variables.
In the next time the RecRawStatSyncCount func will be called it will override
the "zero" value in the records table.
For example - http_total_client_connections_ipv4_stat
1. This stat is used in proxy/http/HttpClientSession.cc
2. The macro HTTP_INCREMENT_DYN_STAT using the RecIncrRawStat func to
increament the stat value.
3. The RecIncrRawStat increament the sum counter on the specific net thread.
4. RecRawStatSyncCount is called in a loop and summarize all the stats in the
net thread to one global value.
5. RecRegisterRawStatSyncCb is called to update the global value in the
records table.
I'm attaching a patch to fix it.
1. add -z/-Z otipns to traffic_line - to reset specific stat.
2. I added a version variable to the record of the stat - so that if we want to
reset a record - we will increase this record.
3. On the next sync to global call (RecExecRawStatSyncCbs in RecProcess.cc) it
will clear the sum/counter in the net-tread variables.
There is another issue about the RecDecrRawStat function - I'll open on it
another Jira.
Regards,
Yakov Kopel.
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