[CASSANDRA-9021] AssertionError and Leak detected during sstable compaction

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.1.5

Environment

Cluster setup:

• 20-node stress cluster, GCE n1-standard-2
• 10-node receiver cluster ingesting data, GCE n1-standard-8

Platform:

• Ubuntu 12.0.4 x86_64

Versions:

• DSE 4.7.0
• Cassandra 2.1.3.304
• Java 1.7.0_45

DSE Configuration:

• Xms7540M
• Xmx7540M
• Xmn800M
• Ddse.system_cpu_cores=8 -Ddse.system_memory_in_mb=30161
• Dcassandra.config.loader=com.datastax.bdp.config.DseConfigurationLoader
• ea -javaagent:/usr/local/lib/dse/resources/cassandra/lib/jamm-0.3.0.jar
• XX:+CMSClassUnloadingEnabled -XX:+UseThreadPriorities
• XX:ThreadPriorityPolicy=42 -Xms7540M -Xmx7540M -Xmn800M
• XX:+HeapDumpOnOutOfMemoryError -Xss256k
• XX:StringTableSize=1000003 -XX:+UseParNewGC
• XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled
• XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1
• XX:CMSInitiatingOccupancyFraction=75
• XX:+UseCMSInitiatingOccupancyOnly -XX:+UseTLAB

• Severity: Normal
• Assignee: Benedict Elliott Smith
• Reporter: Rocco Varela

Authors

Benedict Elliott Smith

Reviewers

Joshua McKenzie

• Created: 23/Mar/15 18:06
• Updated: 16/Apr/19 09:31
• Resolved: 24/Mar/15 23:51

Description

After ~3 hours of data ingestion we see assertion errors and 'LEAK DETECTED' errors during what looks like sstable compaction.

system.log snippets (full log attached):

...
INFO  [CompactionExecutor:12] 2015-03-23 02:45:51,770  CompactionTask.java:267 - Compacted 4 sstables to [/mnt/cass_data_disks/data1/requests_ks/timeline-       9500fe40d0f611e495675d5ea01541b5/requests_ks-timeline-ka-185,].  65,916,594 bytes to 66,159,512 (~100% of original) in 26,554ms = 2.376087MB/s.  983 total       partitions merged to 805.  Partition merge counts were {1:627, 2:178, }
INFO  [CompactionExecutor:11] 2015-03-23 02:45:51,837  CompactionTask.java:267 - Compacted 4 sstables to [/mnt/cass_data_disks/data1/system/                     compactions_in_progress-55080ab05d9c388690a4acb25fe1f77b/system-compactions_in_progress-ka-119,].  426 bytes to 42 (~9% of original) in 82ms = 0.000488MB/s.  5  total partitions merged to 1.  Partition merge counts were {1:1, 2:2, }
ERROR [NonPeriodicTasks:1] 2015-03-23 02:45:52,251  CassandraDaemon.java:167 - Exception in thread Thread[NonPeriodicTasks:1,5,main]
java.lang.AssertionError: null
 at org.apache.cassandra.io.compress.CompressionMetadata$Chunk.<init>(CompressionMetadata.java:438) ~[cassandra-all-2.1.3.304.jar:2.1.3.304]
 at org.apache.cassandra.io.compress.CompressionMetadata.chunkFor(CompressionMetadata.java:228) ~[cassandra-all-2.1.3.304.jar:2.1.3.304]
 at org.apache.cassandra.io.util.CompressedPoolingSegmentedFile.dropPageCache(CompressedPoolingSegmentedFile.java:80) ~[cassandra-all-2.1.3.304.jar:2.1.3.304]
 at org.apache.cassandra.io.sstable.SSTableReader$6.run(SSTableReader.java:923) ~[cassandra-all-2.1.3.304.jar:2.1.3.304]
 at org.apache.cassandra.io.sstable.SSTableReader$InstanceTidier$1.run(SSTableReader.java:2036) ~[cassandra-all-2.1.3.304.jar:2.1.3.304]
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[na:1.7.0_45]
 at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_45]
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) ~[na:1.7.0_45]
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) ~[na:1.7.0_45]
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_45]
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_45]
 at java.lang.Thread.run(Thread.java:744) [na:1.7.0_45]
...
INFO  [MemtableFlushWriter:50] 2015-03-23 02:47:29,465  Memtable.java:378 - Completed flushing /mnt/cass_data_disks/data1/requests_ks/timeline-                  9500fe40d0f611e495675d5ea01541b5/requests_ks-timeline-ka-188-Data.db (16311981 bytes) for commitlog position ReplayPosition(segmentId=1427071574495,             position=4523631)
ERROR [Reference-Reaper:1] 2015-03-23 02:47:33,987  Ref.java:181 - LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@2f59b10) to class org.apache.cassandra.io.sstable.SSTableReader$DescriptorTypeTidy@1251424500:/mnt/cass_data_disks/data1/requests_ks/timeline-9500fe40d0f611e495675d5ea01541b5/    requests_ks-timeline-ka-149 was not released before the reference was garbage collected
INFO  [Service Thread] 2015-03-23 02:47:40,158  GCInspector.java:142 - ConcurrentMarkSweep GC in 12247ms.  CMS Old Gen: 5318987136 -> 457655168; CMS Perm Gen:   44731264 -> 44699160; Par Eden Space: 8597912 -> 418006664; Par Survivor Space: 71865728 -> 59679584
...