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From 金剑 <jinjia...@gmail.com>
Subject Re: Cassandra services down frequently [Version 1.1.4]
Date Mon, 08 Apr 2013 01:16:45 GMT
It also use off-heap memory out of JVM. SerializingCacheProvider should be
one of the case.

Best Regards!

Jian Jin


2013/4/6 <adeel.akbar@panasiangroup.com>

> Thank you Aaron and Bryan for your advice.
>
> I have changed following parameters and now Cassandra running absolutely
> fine. Please review below setting and advice am I right or right direction.
>
> cassandra-env.sh
> #JVM_OPTS="$JVM_OPTS -ea"
> MAX_HEAP_SIZE="6G"
> HEAP_NEWSIZE="500M"
>
>  cassandra.yaml
> # do not persist caches to disk
> key_cache_save_period: 0
> row_cache_save_period: 0
>
> key_cache_size_in_mb: 512
> row_cache_size_in_mb: 14336
> row_cache_provider: SerializingCacheProvider
>
> I have a querry, if Cassandra is using JVM for all operations then why we
> need change above parameters separately in cassandra.yaml.
>
>
> Thanks & Regards
>
> Adeel Akbar
>
>
> Quoting aaron morton <aaron@thelastpickle.com>:
>
>  We can see from below that you've tweaked and disabled many of the
>>>  memory "safety valve" and other memory related settings.
>>>
>> Agree.
>> Also you are running with JVM heap size of 3.81GB which is non  default.
>> For a 16GB node I would expect 8GB.
>>
>> Try restoring the yaml values to the defaults and allowing the
>>  cassandra-env.sh file to determine the memory size.
>>
>> Cheers
>>
>> -----------------
>> Aaron Morton
>> Freelance Cassandra Consultant
>> New Zealand
>>
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 5/04/2013, at 12:36 PM, Bryan Talbot <btalbot@aeriagames.com> wrote:
>>
>>  On Thu, Apr 4, 2013 at 1:27 AM, <adeel.akbar@panasiangroup.com**> wrote:
>>>
>>> After some time (1 hour / 2 hour) cassandra shut services on one or  two
>>> nodes with follwoing errors;
>>>
>>>
>>> Wonder what the workload and schema is like ...
>>>
>>> We can see from below that you've tweaked and disabled many of the
>>>  memory "safety valve" and other memory related settings.  Those  could be
>>> causing issues too.
>>>
>>>
>>> hinted_handoff_throttle_delay_**in_ms: 0
>>> flush_largest_memtables_at: 1.0
>>> reduce_cache_sizes_at: 1.0
>>> reduce_cache_capacity_to: 0.6
>>> rpc_keepalive: true
>>> rpc_server_type: sync
>>> rpc_min_threads: 16
>>> rpc_max_threads: 2147483647
>>> in_memory_compaction_limit_in_**mb: 256
>>> compaction_throughput_mb_per_**sec: 16
>>> rpc_timeout_in_ms: 15000
>>> dynamic_snitch_badness_**threshold: 0.0
>>>
>>
>>
>>
>

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