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From Manu Zhang <owenzhang1...@gmail.com>
Subject Re: Why my Cassandra is compacting like mad
Date Mon, 15 Oct 2012 15:50:13 GMT
I use default option for compaction:
   in_memory_compaction_limit_in_mb: 64
   multithreaded_compaction: false
   compaction_throughput_mb_per_sec: 16
   compaction_preheat_key_cache: true


I aborted Cassandra after a timeout query;
my Cassandra is 1.2beta-2
I don't what hardware information may help

On Mon, Oct 15, 2012 at 11:19 PM, Michael Kjellman
<mkjellman@barracuda.com>wrote:

> And to clarify my reply, this was a loop in compactions on
> system-schema_columns specifically.
>
> From: Michael Kjellman <mkjellman@barracuda.com>
> Reply-To: "user@cassandra.apache.org" <user@cassandra.apache.org>
> Date: Monday, October 15, 2012 8:11 AM
> To: "user@cassandra.apache.org" <user@cassandra.apache.org>
> Subject: Re: Why my Cassandra is compacting like mad
>
> I had a similar bug with 1.1.5 but I couldn't reproduce it so I didn't
> file a bug. I did a rolling restart of my nodes and things went back to
> normal.
>
> From: Manu Zhang <owenzhang1990@gmail.com>
> Reply-To: "user@cassandra.apache.org" <user@cassandra.apache.org>
> Date: Monday, October 15, 2012 8:02 AM
> To: "user@cassandra.apache.org" <user@cassandra.apache.org>
> Subject: Why my Cassandra is compacting like mad
>
> My Cassandra is compacting like mad (look at the following messages) after
> I restart it after a timeout query. It won't stop until I kill the process.
>
>
> INFO 22:57:41,839 Compacting
> [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1258-Data.db')]
>  INFO 22:57:42,077 Compacted to
> [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1259-Data.db,].
>  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.017539MB/s.
>  Time: 238ms.
>  INFO 22:57:42,079 Compacting
> [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1259-Data.db')]
>  INFO 22:57:42,309 Compacted to
> [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1260-Data.db,].
>  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.018149MB/s.
>  Time: 230ms.
>  INFO 22:57:42,311 Compacting
> [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1260-Data.db')]
>  INFO 22:57:42,574 Compacted to
> [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1261-Data.db,].
>  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.015872MB/s.
>  Time: 263ms.
>  INFO 22:57:42,576 Compacting
> [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1261-Data.db')]
>  INFO 22:57:42,814 Compacted to
> [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1262-Data.db,].
>  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.017539MB/s.
>  Time: 238ms.
>  INFO 22:57:42,816 Compacting
> [SSTableReader(path='/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1262-Data.db')]
>  INFO 22:57:43,070 Compacted to
> [/home/manuzhang/cassandra/data/system/schema_columns/system-schema_columns-ia-1263-Data.db,].
>  4,377 to 4,377 (~100% of original) bytes for 3 keys at 0.016434MB/s.
>  Time: 254ms.
>
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