[CASSANDRA-4597] Impossible to set LeveledCompactionStrategy to a column family.

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 1.1.5

Environment

Ubuntu 12.04
cqlsh 2.2.0 | Cassandra 1.1.1 | CQL spec 3.0.0 | Thrift protocol 19.32.0
Cluster with only 1 node

• Severity: Normal
• Assignee: Pavel Yaskevich
• Reporter: jal

Authors

Pavel Yaskevich

Reviewers

Jonathan Ellis

• Created: 31/Aug/12 07:51
• Updated: 16/Apr/19 09:32
• Resolved: 04/Sep/12 11:40

Description

CFPropDefs.applyToCFMetadata() does not set the compaction class on CFM

When altering the compaction strategy of a column family to LeveledCompactionStrategy, the compaction strategy is not changed (the describe command shows that the SizeTieredCompactionStrategy is still set to the CF)
When creating a column family WITH compaction_strategy_class='LeveledCompactionStrategy', the compaction strategy class used is SizeTieredCompactionStrategy

Ex :
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
...

Same behaviour using cqlsh or command-cli.