only 1/8 of heap is used. Only system-schema_columns cf is compacted. The weird thing is that it never stops itself.
On Tue, Oct 16, 2012 at 5:14 PM, Alain RODRIGUEZ <arodr...@gmail.com> wrote: > "I don't what hardware information may help" > > A low memory server will produce an intensive use of CPU and disk IO. It > will write a lot of small SSTables which will need to be compacted very > often. That was one of my thought when I asked. > > Alain > > > 2012/10/15 Manu Zhang <owenzhang1...@gmail.com> > >> 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 < >> mkjell...@barracuda.com> wrote: >> >>> And to clarify my reply, this was a loop in compactions on >>> system-schema_columns specifically. >>> >>> From: Michael Kjellman <mkjell...@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 <owenzhang1...@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. >>> >>> ---------------------------------- >>> 'Like' us on Facebook for exclusive content and other resources on all >>> Barracuda Networks solutions. >>> Visit http://barracudanetworks.com/facebook >>> >>> >>> ---------------------------------- >>> 'Like' us on Facebook for exclusive content and other resources on all >>> Barracuda Networks solutions. >>> Visit http://barracudanetworks.com/facebook >>> >>> >> >> >
