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From André Cruz <andre.c...@co.sapo.pt>
Subject Re: Row cache and counters
Date Thu, 03 Jan 2013 15:25:04 GMT
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.cruz@co.sapo.pt> wrote:

> On Dec 29, 2012, at 8:53 PM, Mohit Anchlia <mohitanchlia@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
> 
> 

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