I am running stress test and on one of the nodes I see:
[root@dsdb5 ~]# nodetool -h `hostname` tpstats
Pool Name Active Pending Completed
ReadStage 0 0 2495
RequestResponseStage 0 0 242202
MutationStage 48 521 287850
ReadRepairStage 0 0 799
GossipStage 0 0 10639
AntiEntropyStage 0 0 0
MigrationStage 0 0 202
MemtablePostFlusher 1 2 1047
StreamStage 0 0 0
FlushWriter 1 1 1047
FILEUTILS-DELETE-POOL 0 0 2048
MiscStage 0 0 0
FlushSorter 0 0 0
InternalResponseStage 0 0 0
HintedHandoff 1 3 5
and cfstats
Keyspace: StressKeyspace
Read Count: 2494
Read Latency: 4987.431669206095 ms.
Write Count: 281705
Write Latency: 0.017631469090005503 ms.
Pending Tasks: 49
Column Family: StressStandard
SSTable count: 882
Space used (live): 139589196497
Space used (total): 139589196497
Memtable Columns Count: 6
Memtable Data Size: 14204955
Memtable Switch Count: 1932
Read Count: 2494
Read Latency: 5921.633 ms.
Write Count: 282522
Write Latency: 0.017 ms.
Pending Tasks: 32
Key cache capacity: 1000000
Key cache size: 1198
Key cache hit rate: 0.0013596193065941536
Row cache: disabled
Compacted row minimum size: 219343
Compacted row maximum size: 5839588
Compacted row mean size: 557125
I am just running simple test in 6 node cassandra 4 GB heap, 96 GB RAM and
12 core per host. I am inserting 1M rows with avg col size of 250k. I keep
getting "Dropped mutation" messages in logs. Not sure how to troubleshoot or
tune it.
Can someone please help?
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