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From feedly team <feedly...@gmail.com>
Subject Re: How to set LeveledCompactionStrategy for an existing table
Date Thu, 30 Aug 2012 18:11:53 GMT
in cassandra-cli, i did something like:

update column family xyz with
compaction_strategy='LeveledCompactionStrategy'

On Thu, Aug 30, 2012 at 5:20 AM, Jean-Armel Luce <jaluce06@gmail.com> wrote:

>
> Hello,
>
> I am using Cassandra 1.1.1 and CQL3.
> I have a cluster with 1 node (test environment)
> Could you tell how to set the compaction strategy to Leveled Strategy for
> an existing table ?
>
> I have a table pns_credentials
>
> jal@jal-VirtualBox:~/cassandra/apache-cassandra-1.1.1/bin$ ./cqlsh -3
> Connected to Test Cluster at localhost:9160.
> [cqlsh 2.2.0 | Cassandra 1.1.1 | CQL spec 3.0.0 | Thrift protocol 19.32.0]
> Use HELP for help.
> cqlsh> use test1;
> cqlsh:test1> describe table pns_credentials;
>
> CREATE TABLE pns_credentials (
>   ise text PRIMARY KEY,
>   isnew int,
>   ts timestamp,
>   mergestatus int,
>   infranetaccount text,
>   user_level int,
>   msisdn bigint,
>   mergeusertype int
> ) WITH
>   comment='' AND
>   comparator=text AND
>   read_repair_chance=0.100000 AND
>   gc_grace_seconds=864000 AND
>   default_validation=text AND
>   min_compaction_threshold=4 AND
>   max_compaction_threshold=32 AND
>   replicate_on_write='true' AND
>   compaction_strategy_class='SizeTieredCompactionStrategy' AND
>   compression_parameters:sstable_compression='SnappyCompressor';
>
> I want to set the LeveledCompaction strategy for this table, so I execute
> the following ALTER TABLE :
>
> cqlsh:test1> alter table pns_credentials
>          ... WITH compaction_strategy_class='LeveledCompactionStrategy'
>          ... AND compaction_strategy_options:sstable_size_in_mb=10;
>
> In Cassandra logs, I see some informations :
>  INFO 10:23:52,532 Enqueuing flush of
> Memtable-schema_columnfamilies@965212657(1391/1738 serialized/live bytes,
> 20 ops)
>  INFO 10:23:52,533 Writing Memtable-schema_columnfamilies@965212657(1391/1738
> serialized/live bytes, 20 ops)
>  INFO 10:23:52,629 Completed flushing
> /var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-hd-94-Data.db
> (1442 bytes) for commitlog position ReplayPosition(segmentId=3556583843054,
> position=1987)
>
>
> However, when I look at the description of the table, the table is still
> with the SizeTieredCompactionStrategy
> cqlsh:test1> describe table pns_credentials ;
>
> CREATE TABLE pns_credentials (
>   ise text PRIMARY KEY,
>   isnew int,
>   ts timestamp,
>   mergestatus int,
>   infranetaccount text,
>   user_level int,
>   msisdn bigint,
>   mergeusertype int
> ) WITH
>   comment='' AND
>   comparator=text AND
>   read_repair_chance=0.100000 AND
>   gc_grace_seconds=864000 AND
>   default_validation=text AND
>   min_compaction_threshold=4 AND
>   max_compaction_threshold=32 AND
>   replicate_on_write='true' AND
>   compaction_strategy_class='SizeTieredCompactionStrategy' AND
>   compression_parameters:sstable_compression='SnappyCompressor';
>
> In the schema_columnfamilies table (in system keyspace), the table
> pns_credentials is still using the SizeTieredCompactionStrategy
> cqlsh:test1> use system;
> cqlsh:system> select * from schema_columnfamilies ;
> ...
>          test1 |   pns_credentials |                   null | KEYS_ONLY
> |                        [] |         |
> org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy
> |                          {}
> |
> org.apache.cassandra.db.marshal.UTF8Type |
> {"sstable_compression":"org.apache.cassandra.io.compress.SnappyCompressor"}
> |          org.apache.cassandra.db.marshal.UTF8Type |           864000 |
> 1029 |       ise |     org.apache.cassandra.db.marshal.UTF8Type
> |                        0 |                       32
> |                        4 |                0.1 |               True
> |          null | Standard |        null
> ...
>
>
> I stopped/started the Cassandra node, but the table is still with
> SizeTieredCompactionStrategy
>
> I tried using cassandra-cli, but the alter is still unsuccessfull.
>
> Is there anything I am missing ?
>
>
> Thanks.
>
> Jean-Armel
>

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