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From Tamar Fraenkel <ta...@tok-media.com>
Subject GCInspector info messages in cassandra log
Date Tue, 14 Aug 2012 04:45:49 GMT
Hi!
I have 3 nodes ring running on Amazon EC2.
About once a week I see in the logs compaction messages and around the same
time info messages about GC (see below) that I think means it is taking too
long and happening too often.

Does it mean I have to reduce my cache size?
Thanks,
Tamar

 INFO [ScheduledTasks:1] 2012-08-13 12:50:57,593 GCInspector.java (line
122) GC for ParNew: 242 ms for 1 collections, 1541590352 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:27,740 GCInspector.java (line
122) GC for ParNew: 291 ms for 1 collections, 1458227032 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:29,741 GCInspector.java (line
122) GC for ParNew: 261 ms for 1 collections, 1228861368 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:30,833 GCInspector.java (line
122) GC for ParNew: 319 ms for 1 collections, 1120131360 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:32,863 GCInspector.java (line
122) GC for ParNew: 241 ms for 1 collections, 983144216 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:33,864 GCInspector.java (line
122) GC for ParNew: 215 ms for 1 collections, 967702720 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:34,964 GCInspector.java (line
122) GC for ParNew: 248 ms for 1 collections, 973803344 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:41,211 GCInspector.java (line
122) GC for ParNew: 265 ms for 1 collections, 1071933560 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:43,212 GCInspector.java (line
122) GC for ParNew: 326 ms for 1 collections, 1217367792 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:44,212 GCInspector.java (line
122) GC for ParNew: 245 ms for 1 collections, 1203481536 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:45,213 GCInspector.java (line
122) GC for ParNew: 209 ms for 1 collections, 1208819416 used; max is
1937768448
 INFO [ScheduledTasks:1] 2012-08-13 12:51:46,237 GCInspector.java (line
122) GC for ParNew: 248 ms for 1 collections, 1338361648 used; max is
1937768448


*Tamar Fraenkel *
Senior Software Engineer, TOK Media

[image: Inline image 1]

tamar@tok-media.com
Tel:   +972 2 6409736
Mob:  +972 54 8356490
Fax:   +972 2 5612956

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