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From Patrick Hunt <ph...@apache.org>
Subject Re: Asking zk cluster how its configured and whats this expired about?
Date Tue, 24 Nov 2009 21:33:14 GMT
stack wrote:
> I want to ask a running zk cluster what its configuration is -- ticktime,
> session timeout, etc. -- but do not see how.  There are the four letter
> words.  Dump and stat do not print what I want.   I took a look in logs --
> the leader in particular -- and do not see vitals dumped out.  Am I missing
> something?

I don't think we provide that through 4letterword or through log. It may 
be available through jmx but not 100% certain on that. I think the only 
way to determine currently is to look at the config file (if you have one).

We can definitely add this, please create a JIRA.

> I was also wondering what this expire stuff in the dump output is about?

Those are the expiration sets, or buckets. Each client session is put 
into a bucket based on when we last heard from it and it's timeout. The 
leader uses this to determine when to expire sessions.

Unfortunately the session ids are being printed in decimal, this is 
fixed in 3.3.0.

Good find, actually this would be useful information for you to monitor 
in determining which of your hbase clients are "falling behind" wrt 
heartbeating.

> Here is what I see:
> 
> $ echo dump|nc X.X.X.X 2181
> SessionTracker dump:
> Session Sets (12):
> 0 expire at Tue Nov 24 20:56:24 UTC 2009:
> 0 expire at Tue Nov 24 20:56:27 UTC 2009:
> 0 expire at Tue Nov 24 20:56:30 UTC 2009:
> 0 expire at Tue Nov 24 20:56:39 UTC 2009:
> 0 expire at Tue Nov 24 20:56:42 UTC 2009:
> 0 expire at Tue Nov 24 20:56:45 UTC 2009:
> 0 expire at Tue Nov 24 20:56:48 UTC 2009:
> 0 expire at Tue Nov 24 20:57:00 UTC 2009:
> 0 expire at Tue Nov 24 20:57:03 UTC 2009:
> 2 expire at Tue Nov 24 20:57:06 UTC 2009:
>         82512629887926272
>         154570223919497222
> 2 expire at Tue Nov 24 20:57:09 UTC 2009:
>         82512629887926273
>         10455035895349254
> 3 expire at Tue Nov 24 20:57:21 UTC 2009:
>         154570223919497216
>         10455035895349248
>         154570223919497221
> 
> ephemeral nodes dump:
> Sessions with Ephemerals (4):
> 0x2524ccbca80000:
>         /hbase/rs/1259042878053
> 0x12524ccb9f40000:
>         /hbase/rs/1259042878032
> 0x12524ccb9f40001:
>         /hbase/rs/1259042878106
> 0x22524ccb9930000:
>         /hbase/master
> 
> Thanks,
> St.Ack
> 

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