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
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Email: ali.ah...@panasiangroup.com
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