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From "Jose Martinez Poblete (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-8269) Large number of system hints & other CF's cause heap to fill and run OOM
Date Thu, 06 Nov 2014 14:51:34 GMT
Jose Martinez Poblete created CASSANDRA-8269:
------------------------------------------------

             Summary: Large number of system hints & other CF's cause heap to fill and
run OOM
                 Key: CASSANDRA-8269
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8269
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: DSE 4.5.0 with Apache Cassandra 2.0.5
            Reporter: Jose Martinez Poblete
         Attachments: alln01-ats-cas2-java_1414110068_Leak_Suspects.zip, system.log

A 3 node cluster with large amount of sstables for system.hints and other 3 user tables was
coming down regularly with OOM on system log showing up the following:

{noformat}
ERROR [OptionalTasks:1] 2014-10-23 18:51:29,052 CassandraDaemon.java (line 199) Exception
in thread Thread[OptionalTasks:1,5,main]
java.lang.OutOfMemoryError: Java heap space
        at org.apache.cassandra.io.sstable.IndexHelper$IndexInfo.deserialize(IndexHelper.java:187)
        at org.apache.cassandra.db.RowIndexEntry$Serializer.deserialize(RowIndexEntry.java:122)
        at org.apache.cassandra.io.sstable.SSTableScanner$KeyScanningIterator.computeNext(SSTableScanner.java:229)
        at org.apache.cassandra.io.sstable.SSTableScanner$KeyScanningIterator.computeNext(SSTableScanner.java:203)
        at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
        at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
        at org.apache.cassandra.io.sstable.SSTableScanner.hasNext(SSTableScanner.java:183)
        at org.apache.cassandra.utils.MergeIterator$Candidate.advance(MergeIterator.java:144)
        at org.apache.cassandra.utils.MergeIterator$ManyToOne.<init>(MergeIterator.java:87)
        at org.apache.cassandra.utils.MergeIterator.get(MergeIterator.java:46)
        at org.apache.cassandra.db.RowIteratorFactory.getIterator(RowIteratorFactory.java:74)
        at org.apache.cassandra.db.ColumnFamilyStore.getSequentialIterator(ColumnFamilyStore.java:1586)
        at org.apache.cassandra.db.ColumnFamilyStore.getRangeSlice(ColumnFamilyStore.java:1709)
        at org.apache.cassandra.db.ColumnFamilyStore.getRangeSlice(ColumnFamilyStore.java:1643)
        at org.apache.cassandra.db.HintedHandOffManager.scheduleAllDeliveries(HintedHandOffManager.java:513)
        at org.apache.cassandra.db.HintedHandOffManager.access$000(HintedHandOffManager.java:91)
        at org.apache.cassandra.db.HintedHandOffManager$1.run(HintedHandOffManager.java:173)
        at org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor$UncomplainingRunnable.run(DebuggableScheduledThreadPoolExecutor.java:75)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:744)
{noformat}

A heapdump would show the following:

{noformat}
Class Name                                                                            | Shallow
Heap | Retained Heap | Percentage
----------------------------------------------------------------------------------------------------------------------------------
java.lang.Thread @ 0x67b292138  OptionalTasks:1 Thread                                |  
       104 | 4,901,485,768 |     58.60%
|- org.apache.cassandra.utils.MergeIterator$ManyToOne @ 0x7b9dc4ad8                   |  
        40 | 4,900,817,312 |     58.59%
|  |- java.util.ArrayList @ 0x6f05f15f0                                               |  
        24 |   403,635,848 |      4.83%
|  |- org.apache.cassandra.io.sstable.SSTableScanner$KeyScanningIterator @ 0x7b5fe7078|  
        40 |    29,669,312 |      0.35%
|  |  |- org.apache.cassandra.db.RowIndexEntry$IndexedEntry @ 0x7b7caaa28             |  
        32 |    26,770,264 |      0.32%
|  |  |- org.apache.cassandra.db.RowIndexEntry$IndexedEntry @ 0x7b7f6e670             |  
        32 |     2,898,864 |      0.03%
|  |  |  '- java.util.ArrayList @ 0x7b7caaae0                                         |  
        24 |     2,898,832 |      0.03%
|  |  |     '- java.lang.Object[12283] @ 0x7b7caaaf8                                  |  
    49,152 |     2,898,808 |      0.03%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb6af8 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb6be0 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb6cc8 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb6db0 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb6e98 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb6f80 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7068 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7150 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7238 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7320 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7408 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb74f0 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb75d8 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb76c0 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb77a8 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7890 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7978 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7a60 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7b48 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7c30 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7d18 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7e00 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7ee8 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb7fd0 |  
        40 |           232 |      0.00%
|  |  |        |- org.apache.cassandra.io.sstable.IndexHelper$IndexInfo @ 0x7b7cb80b8 |  
        40 |           232 |      0.00%
|  |  |        '- Total: 25 of 12,283 entries; 12,258 more                            |  
           |               |           
----------------------------------------------------------------------------------------------------------------------------------
{noformat}

We suspected of large amount of system tables to be an issue:

{noformat}
alln01-ats-cas2: 
============ 
[root@alln01-ats-cas2 ~]# sstableReport | tee /tmp/sstableReport.txt 
Data directory: /cassandra/data 
Total sstable files: 45662 
Itemized: 
ks_r_only test_results_verify FileCount: 3 
mfgprod test_results FileCount: 292 
mfgprod test_results_logs FileCount: 4 
mfgprod test_results_new FileCount: 12 
mfgprod test_results_new2 FileCount: 6 
mfgprod test_results_new3 FileCount: 6 
mfgprod test_results_new4 FileCount: 9633 
mfgprod test_results_new5 FileCount: 9667 
mfgprod test_results_new6 FileCount: 8867 
mfgprod test_results_verify_threads FileCount: 1 
mfgprod test_results_verify_threads_new5 FileCount: 1 
mfgprod test_results_verify_threads_new6 FileCount: 24 
OpsCenter bestpractice_results FileCount: 1 
OpsCenter events FileCount: 6 
OpsCenter events_timeline FileCount: 2 
OpsCenter pdps FileCount: 7 
OpsCenter rollups300 FileCount: 10 
OpsCenter rollups60 FileCount: 29 
OpsCenter rollups7200 FileCount: 1 
OpsCenter rollups86400 FileCount: 1 
OpsCenter settings FileCount: 10 
pkm_test pkm1 FileCount: 1 
stressd Standard1 FileCount: 2 
stress Standard1 FileCount: 1 
system batchlog FileCount: 165 
system compaction_history FileCount: 2 
system compactions_in_progress FileCount: 5 
system hints FileCount: 16856 
system IndexInfo FileCount: 1 
system local FileCount: 2 
system peer_events FileCount: 3 
system peers FileCount: 4 
system schema_columnfamilies FileCount: 3 
system schema_columns FileCount: 3 
system schema_keyspaces FileCount: 3 
system sstable_activity FileCount: 28
{noformat}

System became stable after we rid of the system hints and compacted other 3 user tables:

{noformat}
mfgprod test_results_new4 FileCount: 9633 
mfgprod test_results_new5 FileCount: 9667 
mfgprod test_results_new6 FileCount: 8867 
system hints FileCount: 16856 
{noformat}

Heapdump is rather large to be attached



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