Hi! First, the problem is still there, altough I checked and all node agree on the schema. This is from ls -l Good Node -rw-r--r-- 1 cassandra cassandra 606 2012-09-27 08:01 tk_usus_user-hc-269-CompressionInfo.db -rw-r--r-- 1 cassandra cassandra 2246431 2012-09-27 08:01 tk_usus_user-hc-269-Data.db -rw-r--r-- 1 cassandra cassandra 11056 2012-09-27 08:01 tk_usus_user-hc-269-Filter.db -rw-r--r-- 1 cassandra cassandra 129792 2012-09-27 08:01 tk_usus_user-hc-269-Index.db -rw-r--r-- 1 cassandra cassandra 4336 2012-09-27 08:01 tk_usus_user-hc-269-Statistics.db
Node 2
-rw-r--r-- 1 cassandra cassandra 4592393 2012-09-27 08:01
tk_usus_user-hc-268-Data.db
-rw-r--r-- 1 cassandra cassandra 69 2012-09-27 08:01
tk_usus_user-hc-268-Digest.sha1
-rw-r--r-- 1 cassandra cassandra 11056 2012-09-27 08:01
tk_usus_user-hc-268-Filter.db
-rw-r--r-- 1 cassandra cassandra 129792 2012-09-27 08:01
tk_usus_user-hc-268-Index.db
-rw-r--r-- 1 cassandra cassandra 4336 2012-09-27 08:01
tk_usus_user-hc-268-Statistics.db
Node 3
-rw-r--r-- 1 cassandra cassandra 4592393 2012-09-27 08:01
tk_usus_user-hc-278-Data.db
-rw-r--r-- 1 cassandra cassandra 69 2012-09-27 08:01
tk_usus_user-hc-278-Digest.sha1
-rw-r--r-- 1 cassandra cassandra 11056 2012-09-27 08:01
tk_usus_user-hc-278-Filter.db
-rw-r--r-- 1 cassandra cassandra 129792 2012-09-27 08:01
tk_usus_user-hc-278-Index.db
-rw-r--r-- 1 cassandra cassandra 4336 2012-09-27 08:01
tk_usus_user-hc-278-Statistics.db
Looking at the logs, on the "good node" I can see
INFO [MigrationStage:1] 2012-09-24 10:08:16,511 Migration.java (line 119)
Applying migration c22413b0-062f-11e2-0000-1bcb936807db Update column
family to org.apache.cassandra.config.CFMetaData@1dbdcde9
[cfId=1016,ksName=tok,cfName=tk_usus_user,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),subcolumncomparator=<null>,comment=,rowCacheSize=0.0,keyCacheSize=200000.0,readRepairChance=1.0,replicateOnWrite=true,gcGraceSeconds=864000,defaultValidator=org.apache.cassandra.db.marshal.UTF8Type,keyValidator=org.apache.cassandra.db.marshal.UUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,rowCacheSavePeriodInSeconds=0,keyCacheSavePeriodInSeconds=14400,rowCacheKeysToSave=2147483647,rowCacheProvider=org.apache.cassandra.cache.SerializingCacheProvider@3505231c,mergeShardsChance=0.1,keyAlias=java.nio.HeapByteBuffer[pos=485
lim=488 cap=653],column_metadata={},compactionStrategyClass=class
org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionOptions={sstable_compression=org.apache.cassandra.io.compress.SnappyCompressor,
chunk_length_kb=64},bloomFilterFpChance=<null>]
But same can be seen in the logs of the two other nodes:
INFO [MigrationStage:1] 2012-09-24 10:08:16,767 Migration.java (line 119)
Applying migration c22413b0-062f-11e2-0000-1bcb936807db Update column
family to org.apache.cassandra.config.CFMetaData@24fbb95d
[cfId=1016,ksName=tok,cfName=tk_usus_user,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),subcolumncomparator=<null>,comment=,rowCacheSize=0.0,keyCacheSize=200000.0,readRepairChance=1.0,replicateOnWrite=true,gcGraceSeconds=864000,defaultValidator=org.apache.cassandra.db.marshal.UTF8Type,keyValidator=org.apache.cassandra.db.marshal.UUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,rowCacheSavePeriodInSeconds=0,keyCacheSavePeriodInSeconds=14400,rowCacheKeysToSave=2147483647,rowCacheProvider=org.apache.cassandra.cache.SerializingCacheProvider@a469ba3,mergeShardsChance=0.1,keyAlias=java.nio.HeapByteBuffer[pos=0
lim=3 cap=3],column_metadata={},compactionStrategyClass=class
org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionOptions={sstable_compression=org.apache.cassandra.io.compress.SnappyCompressor,
chunk_length_kb=64},bloomFilterFpChance=<null>]
INFO [MigrationStage:1] 2012-09-24 10:08:16,705 Migration.java (line 119)
Applying migration c22413b0-062f-11e2-0000-1bcb936807db Update column
family to org.apache.cassandra.config.CFMetaData@216b6a58
[cfId=1016,ksName=tok,cfName=tk_usus_user,cfType=Standard,comparator=org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type),subcolumncomparator=<null>,comment=,rowCacheSize=0.0,keyCacheSize=200000.0,readRepairChance=1.0,replicateOnWrite=true,gcGraceSeconds=864000,defaultValidator=org.apache.cassandra.db.marshal.UTF8Type,keyValidator=org.apache.cassandra.db.marshal.UUIDType,minCompactionThreshold=4,maxCompactionThreshold=32,rowCacheSavePeriodInSeconds=0,keyCacheSavePeriodInSeconds=14400,rowCacheKeysToSave=2147483647,rowCacheProvider=org.apache.cassandra.cache.SerializingCacheProvider@1312c88c,mergeShardsChance=0.1,keyAlias=java.nio.HeapByteBuffer[pos=0
lim=3 cap=3],column_metadata={},compactionStrategyClass=class
org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy,compactionStrategyOptions={},compressionOptions={sstable_compression=org.apache.cassandra.io.compress.SnappyCompressor,
chunk_length_kb=64},bloomFilterFpChance=<null>]
I can also see scrub messages in logs
Good node:
INFO [CompactionExecutor:1774] 2012-09-24 10:09:05,402
CompactionManager.java (line 476) Scrubbing
SSTableReader(path='/raid0/cassandra/data/tok/tk_usus_user-hc-264-Data.db')
INFO [CompactionExecutor:1774] 2012-09-24 10:09:05,934
CompactionManager.java (line 658) Scrub of
SSTableReader(path='/raid0/cassandra/data/tok/tk_usus_user-hc-264-Data.db')
complete: 4868 rows in new sstable and 0 empty (tombstoned) rows dropped
Other nodes
INFO [CompactionExecutor:1800] 2012-09-24 10:09:11,789
CompactionManager.java (line 476) Scrubbing
SSTableReader(path='/raid0/cassandra/data/tok/tk_usus_user-hc-260-Data.db')
INFO [CompactionExecutor:1800] 2012-09-24 10:09:12,464
CompactionManager.java (line 658) Scrub of
SSTableReader(path='/raid0/cassandra/data/tok/tk_usus_user-hc-260-Data.db')
complete: 4868 rows in new sstable and 0 empty (tombstoned) rows dropped
INFO [CompactionExecutor:1687] 2012-09-24 10:09:16,235
CompactionManager.java (line 476) Scrubbing
SSTableReader(path='/raid0/cassandra/data/tok/tk_usus_user-hc-271-Data.db')
INFO [CompactionExecutor:1687] 2012-09-24 10:09:16,898
CompactionManager.java (line 658) Scrub of
SSTableReader(path='/raid0/cassandra/data/tok/tk_usus_user-hc-271-Data.db')
compete: 4868 rows in new sstable and 0 empty (tombstoned) rows dropped
Any idea?
Thanks!!
*Tamar Fraenkel *
Senior Software Engineer, TOK Media
[image: Inline image 1]
ta...@tok-media.com
Tel: +972 2 6409736
Mob: +972 54 8356490
Fax: +972 2 5612956
On Wed, Sep 26, 2012 at 3:40 AM, aaron morton <aa...@thelastpickle.com>wrote:
> Check the logs on nodes 2 and 3 to see if the scrub started. The logs on
> 1 will be a good help with that.
>
> Cheers
>
> -----------------
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 24/09/2012, at 10:31 PM, Tamar Fraenkel <ta...@tok-media.com> wrote:
>
> Hi!
> I ran
> UPDATE COLUMN FAMILY cf_name WITH
> compression_options={sstable_compression:SnappyCompressor,
> chunk_length_kb:64};
>
> I then ran on all my nodes (3)
> sudo nodetool -h localhost scrub tok cf_name
>
> I have replication factor 3. The size of the data on disk was cut in half
> in the first node and in the jmx I can see that indeed the compression
> ration is 0.46. But on nodes 2 and 3 nothing happened. In the jmx I can see
> that compression ratio is 0 and the size of the files of disk stayed the
> same.
>
> In cli
>
> ColumnFamily: cf_name
> Key Validation Class: org.apache.cassandra.db.marshal.UUIDType
> Default column value validator:
> org.apache.cassandra.db.marshal.UTF8Type
> Columns sorted by:
> org.apache.cassandra.db.marshal.CompositeType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type)
> Row cache size / save period in seconds / keys to save : 0.0/0/all
> Row Cache Provider:
> org.apache.cassandra.cache.SerializingCacheProvider
> Key cache size / save period in seconds: 200000.0/14400
> GC grace seconds: 864000
> Compaction min/max thresholds: 4/32
> Read repair chance: 1.0
> Replicate on write: true
> Bloom Filter FP chance: default
> Built indexes: []
> Compaction Strategy:
> org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy
> Compression Options:
> chunk_length_kb: 64
> sstable_compression:
> org.apache.cassandra.io.compress.SnappyCompressor
>
> Can anyone help?
> Thanks
>
> *Tamar Fraenkel *
> Senior Software Engineer, TOK Media
>
> <tokLogo.png>
>
>
> ta...@tok-media.com
> Tel: +972 2 6409736
> Mob: +972 54 8356490
> Fax: +972 2 5612956
>
>
>
>
>
> On Mon, Sep 24, 2012 at 8:37 AM, Tamar Fraenkel <ta...@tok-media.com>wrote:
>
>> Thanks all, that helps. Will start with one - two CFs and let you know
>> the effect
>>
>>
>> *Tamar Fraenkel *
>> Senior Software Engineer, TOK Media
>>
>> <tokLogo.png>
>>
>>
>> ta...@tok-media.com
>> Tel: +972 2 6409736
>> Mob: +972 54 8356490
>> Fax: +972 2 5612956
>>
>>
>>
>>
>>
>> On Sun, Sep 23, 2012 at 8:21 PM, Hiller, Dean <dean.hil...@nrel.gov>wrote:
>>
>>> As well as your unlimited column names may all have the same prefix,
>>> right? Like "accounts".rowkey56, "accounts".rowkey78, etc. etc. so the
>>> "accounts gets a ton of compression then.
>>>
>>> Later,
>>> Dean
>>>
>>> From: Tyler Hobbs <ty...@datastax.com<mailto:ty...@datastax.com>>
>>> Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>"
>>> <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
>>> Date: Sunday, September 23, 2012 11:46 AM
>>> To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <
>>> user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
>>> Subject: Re: compression
>>>
>>> column metadata, you're still likely to get a reasonable amount of
>>> compression. This is especially true if there is some amount of repetition
>>> in the column names, values, or TTLs in wide rows. Compression will almost
>>> always be beneficial unless you're already somehow CPU bound or are using
>>> large column values that are high in entropy, such as pre-compressed or
>>> encrypted data.
>>>
>>
>>
>
>
<<tokLogo.png>>
