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From Carlos Rolo <r...@pythian.com>
Subject Re: LCS Strategy, compaction pending tasks keep increasing
Date Tue, 21 Apr 2015 11:16:05 GMT
Are you on version 2.1.x?

Regards,

Carlos Juzarte Rolo
Cassandra Consultant

Pythian - Love your data

rolo@pythian | Twitter: cjrolo | Linkedin: *linkedin.com/in/carlosjuzarterolo
<http://linkedin.com/in/carlosjuzarterolo>*
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On Tue, Apr 21, 2015 at 1:06 PM, Anishek Agarwal <anishek@gmail.com> wrote:

> the "some_bits" column has about 14-15 bytes of data per key.
>
> On Tue, Apr 21, 2015 at 4:34 PM, Anishek Agarwal <anishek@gmail.com>
> wrote:
>
>> Hello,
>>
>> I am inserting about 100 million entries via datastax-java driver to a
>> cassandra cluster of 3 nodes.
>>
>> Table structure is as
>>
>> create keyspace test with replication = {'class':
>> 'NetworkTopologyStrategy', 'DC' : 3};
>>
>> CREATE TABLE test_bits(id bigint primary key , some_bits text) with
>> gc_grace_seconds=0 and compaction = {'class': 'LeveledCompactionStrategy'}
>> and compression={'sstable_compression' : ''};
>>
>> have 75 threads that are inserting data into the above table with each
>> thread having non over lapping keys.
>>
>> I see that the number of pending tasks via "nodetool compactionstats"
>> keeps increasing and looks like from "nodetool cfstats test.test_bits" has
>> SSTTable levels as [154/4, 8, 0, 0, 0, 0, 0, 0, 0],
>>
>> Why is compaction not kicking in ?
>>
>> thanks
>> anishek
>>
>
>

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