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From Ali Ahsan <ali.ah...@panasiangroup.com>
Subject GC for ParNew (cassandra under performance ) 0.6.3
Date Thu, 05 May 2011 15:51:57 GMT
Hi All

I have two cassandra node with RF=2,Cassandra start under performing  i 
mean red write are slow and i see following info in cassandra log.I have 
centos 5.5 64 bit with 14 GB memory assigned to cassandra.I am using LVM 
for cassandra.When i reboot my cassanrda every thing become normal.

Below is some nodetoll info


# /root/cassandra/bin/nodetool -h 10.0.0.4 info
222289592293417191096473651402050455
Load             : 43.51 GB
Generation No    : 1304495724
Uptime (seconds) : 114699
Heap Memory (MB) : 9944.43 / 14319.38


tpstats

[root@cassandra2 cassandra]# /root/cassandra/bin/nodetool -h 10.0.0.4 
tpstats
Pool Name                    Active   Pending      Completed
FILEUTILS-DELETE-POOL             0         0            187
STREAM-STAGE                      0         0              0
RESPONSE-STAGE                    0         0       35901940
ROW-READ-STAGE                    8         9       14580549
LB-OPERATIONS                     0         0              0
MESSAGE-DESERIALIZER-POOL         0         0       54586854
GMFD                              0         0         308503
LB-TARGET                         0         0              0
CONSISTENCY-MANAGER               0         0        7637656
ROW-MUTATION-STAGE                2         2       43329077
MESSAGE-STREAMING-POOL            0         0              0
LOAD-BALANCER-STAGE               0         0              0
FLUSH-SORTER-POOL                 0         0              0
MEMTABLE-POST-FLUSHER             0         0           2028
FLUSH-WRITER-POOL                 0         0           2028
AE-SERVICE-STAGE                  0         0              0
HINTED-HANDOFF-POOL               1        30             97



When i see below info cassandra start under performing and happening on 
both machines.


INFO [GC inspection] 2011-05-05 20:39:08,617 GCInspector.java (line 110) 
GC for ParNew: 698 ms, 138706360 reclaimed leaving 10135848048 used; max 
is 15241445376
  INFO [GC inspection] 2011-05-05 20:39:09,620 GCInspector.java (line 
110) GC for ParNew: 496 ms, 138960224 reclaimed leaving 10135360416 
used; max is 15241445376
  INFO [GC inspection] 2011-05-05 20:39:10,988 GCInspector.java (line 
110) GC for ParNew: 1051 ms, 137654632 reclaimed leaving 10137177208 
used; max is 15241445376
  INFO [GC inspection] 2011-05-05 20:39:13,370 GCInspector.java (line 
110) GC for ParNew: 907 ms, 137254552 reclaimed leaving 10137977152 
used; max is 15241445376
  INFO [GC inspection] 2011-05-05 20:39:14,631 GCInspector.java (line 
110) GC for ParNew: 635 ms, 135828080 reclaimed leaving 10140229096 
used; max is 15241445376
  INFO [GC inspection] 2011-05-05 20:39:16,872 GCInspector.java (line 
110) GC for ParNew: 1910 ms, 137722664 reclaimed leaving 10141548552 
used; max is 15241445376
  INFO [GC inspection] 2011-05-05 20:39:23,463 GCInspector.java (line 
110) GC for ParNew: 6341 ms, 139920392 reclaimed leaving 10141215712 
used; max is 15241445376
  INFO [GC inspection] 2011-05-05 20:39:25,482 GCInspector.java (line 
110) GC for ParNew: 1712 ms, 139482032 reclaimed leaving 10141321232 
used; max is 15241445376


-- 
S.Ali Ahsan

Senior System Engineer

e-Business (Pvt) Ltd

49-C Jail Road, Lahore, P.O. Box 676
Lahore 54000, Pakistan

Tel: +92 (0)42 3758 7140 Ext. 128

Mobile: +92 (0)345 831 8769

Fax: +92 (0)42 3758 0027

Email: ali.ahsan@panasiangroup.com



www.ebusiness-pg.com

www.panasiangroup.com

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