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Zdenek Ott commented on CASSANDRA-8904: --------------------------------------- Thanks. > Compaction pending tasks is 9 but no compaction is running > ---------------------------------------------------------- > > Key: CASSANDRA-8904 > URL: https://issues.apache.org/jira/browse/CASSANDRA-8904 > Project: Cassandra > Issue Type: Bug > Components: Core > Environment: Linux 2.6.32-431.5.1.el6.x86_64 #1 SMP Wed Feb 12 > 00:41:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux > java version "1.7.0_71" > Java(TM) SE Runtime Environment (build 1.7.0_71-b14) > Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode) > [cqlsh 3.1.8 | Cassandra 1.2.18 | CQL spec 3.0.5 | Thrift protocol 19.36.2] > Reporter: Zdenek Ott > Assignee: Carl Yeksigian > Priority: Minor > Labels: compaction > Fix For: 2.0.15 > > Attachments: 8904-2.0.txt > > > I have found mismatch of compaction requirement computation in > LeveldManifest.java > --- > In getCompactionCandidates() method is used following expression: > double score = (double) SSTableReader.getTotalBytes(remaining) / > (double)maxBytesForLevel(i); > And compaction is triggered when score>1.001 > In our situation 671758260447/(10^4*64*1024*1024) = 1.00099 > --- > in getEstimatedTasks() method is used different expression: > estimated[i] = Math.max(0L, SSTableReader.getTotalBytes(sstables) - > maxBytesForLevel(i)) / maxSSTableSizeInBytes > In our situation (671758260447-(10^4*64*1024*1024))/(64*1024*1024) = 9.97812 > implicitly converted to long is 9 > --- > Here are debug log parts and column family create command: > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,173 LeveledManifest.java > (line 384) L0 contains 2 SSTables (24467649 bytes) in Manifest@160946690 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,173 LeveledManifest.java > (line 384) L1 contains 10 SSTables (659509359 bytes) in Manifest@160946690 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,173 LeveledManifest.java > (line 384) L2 contains 105 SSTables (6670197371 bytes) in Manifest@160946690 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,173 LeveledManifest.java > (line 384) L3 contains 1043 SSTables (67139124061 bytes) in Manifest@160946690 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,174 LeveledManifest.java > (line 384) L4 contains 10410 SSTables (671758260447 bytes) in > Manifest@160946690 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,174 LeveledManifest.java > (line 384) L5 contains 75 SSTables (5019585316 bytes) in Manifest@160946690 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,191 LeveledManifest.java > (line 346) Compaction score for level 5 is 7.479764991998672E-4 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,196 LeveledManifest.java > (line 346) Compaction score for level 4 is 1.0009978122219443 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,197 LeveledManifest.java > (line 346) Compaction score for level 3 is 1.0004509100466967 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,197 LeveledManifest.java > (line 346) Compaction score for level 2 is 0.9939368622004986 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,197 LeveledManifest.java > (line 346) Compaction score for level 1 is 0.9827455267310142 > DEBUG [CompactionExecutor:1695] 2015-03-04 10:31:46,197 LeveledManifest.java > (line 346) Compaction score for level 0 is 0.0883796289563179 > DEBUG [RMI TCP Connection(3047)-77.234.40.29] 2015-03-04 10:32:18,093 > LeveledManifest.java (line 670) Estimating [0, 0, 0, 0, 9, 0, 0, 0, 0] > compactions to do for fr.sha > CREATE TABLE sha ( > "KEY" blob, > column1 blob, > value blob, > PRIMARY KEY ("KEY", column1) > ) WITH COMPACT STORAGE AND > bloom_filter_fp_chance=0.100000 AND > caching='NONE' AND > comment='' AND > dclocal_read_repair_chance=0.000000 AND > gc_grace_seconds=172800 AND > read_repair_chance=0.000000 AND > replicate_on_write='true' AND > populate_io_cache_on_flush='false' AND > compaction={'sstable_size_in_mb': '64', 'class': > 'LeveledCompactionStrategy'} AND > compression={}; -- This message was sent by Atlassian JIRA (v6.3.4#6332)