cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Thunder Stumpges <thunder.stump...@gmail.com>
Subject Re: delay/stall processing reads
Date Thu, 02 Jan 2014 23:08:38 GMT
Thanks Rob,

Well from what I see in system.log it does not appear that GC aligns with
this delay. Though it does seem like quite a few GCs take place. Here is my
system.log around the time of the delay:

 INFO [ScheduledTasks:1] 2014-01-02 12:30:22,164 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 479 ms for 1 collections, 7417499584 used;
max is 8375238656
 INFO [ScheduledTasks:1] 2014-01-02 12:30:37,579 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 557 ms for 1 collections, 7663015624 used;
max is 8375238656
 INFO [ScheduledTasks:1] 2014-01-02 12:31:50,416 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 633 ms for 1 collections, 6053238384 used;
max is 8375238656
 INFO [ScheduledTasks:1] 2014-01-02 12:32:06,525 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 219 ms for 1 collections, 6430575008 used;
max is 8375238656
 INFO [ScheduledTasks:1] 2014-01-02 12:32:22,548 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 296 ms for 1 collections, 6732761584 used;
max is 8375238656
 INFO [ScheduledTasks:1] 2014-01-02 12:32:37,870 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 343 ms for 1 collections, 7020263776 used;
max is 8375238656
 INFO [ScheduledTasks:1] 2014-01-02 12:32:53,116 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 443 ms for 1 collections, 7276089816 used;
max is 8375238656
 INFO [ScheduledTasks:1] 2014-01-02 12:33:08,557 GCInspector.java (line
116) GC for ConcurrentMarkSweep: 554 ms for 1 collections, 7662839184 used;
max is 8375238656

The earliest start time on my three delayed requests is 12:32:00.083 and
they all clear out at 12:32:00.517. GC log events occur at 12:31:50 and at
21:32:06. The above entries are the only log entries in system.log at this
time. Any other ideas?

Is this type of GC frequency and delay "normal" ?

thanks,
Thunder




On Thu, Jan 2, 2014 at 2:27 PM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Thu, Jan 2, 2014 at 2:24 PM, Thunder Stumpges <
> thunder.stumpges@gmail.com> wrote:
>
>> Excuse my ignorance, but where would I look for the GC info? What logs
>> contain this? I will start looking for log files and more clues in them.
>>
>
> system.log contains some basic info, you can enable extended gc info via
> options to the JVM.
>
> =Rob
>
>

Mime
View raw message