[ https://issues.apache.org/jira/browse/CASSANDRA-3224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-3224: -------------------------------------- Attachment: 3224-v3.txt v3 improves some logging and adds an assert > LeveledCompactionStrategy is too complacent > ------------------------------------------- > > Key: CASSANDRA-3224 > URL: https://issues.apache.org/jira/browse/CASSANDRA-3224 > Project: Cassandra > Issue Type: Bug > Components: Core > Affects Versions: 1.0.0 > Reporter: Brandon Williams > Assignee: Jonathan Ellis > Labels: compaction > Fix For: 1.0.0 > > Attachments: 3224-v2.txt, 3224-v3.txt, 3224.txt, system.log.bz2 > > > As the title says, it barely does anything. I inserted 50G worth of data > with 1G heap and 99% overwrite ratio, and it only compacted twice: > {noformat} > INFO [CompactionExecutor:1] 2011-09-16 22:29:54,572 CompactionTask.java > (line 118) Compacting > [SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1-h-1-Data.db')] > INFO [CompactionExecutor:1] 2011-09-16 22:29:58,606 CompactionTask.java > (line 220) Compacted to > [/var/lib/cassandra/data/Keyspace1/Standard1-h-2-Data.db,/var/lib/cassandra/data/Keyspace1/Standard1-h-4-Data.db,/var/lib/cassandra/data/Keyspace1/Standard1-h-5-Data.db,]. > 12,595,811 to 12,595,811 (~100% of original) bytes for 40,501 keys at > 3.058122MBPS. Time: 3,928ms. > INFO [CompactionExecutor:1] 2011-09-16 22:29:58,607 CompactionTask.java > (line 222) CF Total Bytes Compacted: 12,595,811 > INFO [CompactionExecutor:3] 2011-09-16 22:29:58,889 CompactionTask.java > (line 118) Compacting > [SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1-h-4-Data.db'), > > SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1-h-2-Data.db'), > > SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1-h-5-Data.db'), > > SSTableReader(path='/var/lib/cassandra/data/Keyspace1/Standard1-h-3-Data.db')] > INFO [CompactionExecutor:3] 2011-09-16 22:30:06,900 CompactionTask.java > (line 220) Compacted to > [/var/lib/cassandra/data/Keyspace1/Standard1-h-7-Data.db,/var/lib/cassandra/data/Keyspace1/Standard1-h-9-Data.db,/var/lib/cassandra/data/Keyspace1/Standard1-h-11-Data.db,/var/lib/cassandra/data/Keyspace1/Standard1-h-12-Data.db,/var/lib/cassandra/data/Keyspace1/Standard1-h-14-Data.db,/var/lib/cassandra/data/Keyspace1/Standard1-h-15-Data.db,]. > 28,374,396 to 28,374,396 (~100% of original) bytes for 91,236 keys at > 3.380379MBPS. Time: 8,005ms. > INFO [CompactionExecutor:3] 2011-09-16 22:30:06,901 CompactionTask.java > (line 222) CF Total Bytes Compacted: 40,970,207 > {noformat} > Resulting in the following levels: > {noformat} > L0: 4965 > L1: 6 > L2: 0 > L3: 0 > L4: 0 > L5: 0 > L6: 0 > L7: 0 > {noformat} > This is obviously going to result in extremely poor read performance. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira