Does anyone see anything wrong in these settings? Anything to account for a 8s timeout during a counter increment?
Thanks, André On 31/12/2012, at 14:35, André Cruz <andre.c...@co.sapo.pt> wrote: > 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 > >
