On Dec 29, 2012, at 8:53 PM, Mohit Anchlia <mohitanch...@gmail.com> wrote:
> Can you post gc settings? Also check logs and see what it says
These are the relevant jam settings:
-home /usr/lib/jvm/j2re1.6-oracle/bin/../
-ea -javaagent:/usr/share/cassandra/lib/jamm-0.2.5.jar
-XX:+UseThreadPriorities
-XX:ThreadPriorityPolicy=42
-Xms8049M
-Xmx8049M
-Xmn800M
-XX:+HeapDumpOnOutOfMemoryError
-Xss196k
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:+CMSParallelRemarkEnabled
-XX:SurvivorRatio=8
-XX:MaxTenuringThreshold=1
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly
-Djava.net.preferIPv4Stack=true
I have 3 servers (32GB RAM), with a RF of 3. I searched all of them for log
messages related to a period when I had timeouts (19h20-19h30), only one of
them showed messages for that timeframe, and none seem related with that CF:
INFO [MemoryMeter:1] 2012-12-27 19:20:17,858 Memtable.java (line 213)
CFS(Keyspace='Disco', ColumnFamily='RevisionLog') liveRatio is
4.318314007200407 (just-counted was 4.318314007200407). calculation took 350ms
for 8623 columns
INFO [MemoryMeter:1] 2012-12-27 19:23:37,148 Memtable.java (line 213)
CFS(Keyspace='Disco', ColumnFamily='LinkPathsExist') liveRatio is
25.87012987012987 (just-counted was 25.87012987012987). calculation took 0ms
for 10 columns
INFO [MemoryMeter:1] 2012-12-27 19:28:32,736 Memtable.java (line 213)
CFS(Keyspace='Disco', ColumnFamily='BlockMetadata.BlockMetadata_used_idx')
liveRatio is 1.7176206177506523 (just-counted was 1.7176206177506523).
calculation took 62ms for 12941 columns
INFO [MemoryMeter:1] 2012-12-27 19:30:12,752 Memtable.java (line 213)
CFS(Keyspace='Disco', ColumnFamily='Namespace') liveRatio is 20.097473571044617
(just-counted was 20.097473571044617). calculation took 10ms for 288 columns
INFO [MemoryMeter:1] 2012-12-27 19:30:28,421 Memtable.java (line 213)
CFS(Keyspace='Disco', ColumnFamily='NamespaceDir') liveRatio is
4.801010311533358 (just-counted was 4.801010311533358). calculation took 96ms
for 3138 columns
> Also post how many writes and reads along with avg row size
All rows have 3-6 counters. As for writes and reads:
Column Family: UserQuotas
SSTable count: 3
Space used (live): 2609839
Space used (total): 2609839
Number of Keys (estimate): 22016
Memtable Columns Count: 142705
Memtable Data Size: 768117
Memtable Switch Count: 26
Read Count: 822203
Read Latency: 0.305 ms.
Write Count: 1024277
Write Latency: 0.066 ms.
Pending Tasks: 0
Bloom Filter False Postives: 3
Bloom Filter False Ratio: 0.00000
Bloom Filter Space Used: 42584
Compacted row minimum size: 125
Compacted row maximum size: 770
Compacted row mean size: 298
Is there anything wrong with my configuration?
Best regards,
André Cruz
