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From "Wei Deng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-8964) SSTable count rises during compactions and max open files exceeded
Date Thu, 21 Jul 2016 08:15:20 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-8964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei Deng updated CASSANDRA-8964:
--------------------------------
    Labels: lcs  (was: )

> SSTable count rises during compactions and max open files exceeded
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-8964
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8964
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Apache Cassandra 2.1.2
> Centos 6
> AWS EC2
> i2.2xlarge
>            Reporter: Anthony Fisk
>            Priority: Critical
>              Labels: lcs
>         Attachments: lsof_with_tmp.txt, lsof_without_tmp.txt, nodetool_cfstats.zip
>
>
> LCS compaction was not able to keep up with the prolonged insert load on one of our tables
called log, resulting in 2,185 SSTables for that table and 1,779 pending compactions all together
during a test we were running.
> We stopped our load, unthrottled compaction throughput, increased the concurrent compactors
from 2 to 8, and let it compact the SSTables.
> All was going well until the number of SSTables count for our log table got down to around
97, then began rising again until it had reached 758 SSTables 1.5 hours later... (we've been
recording the cfstats output every half hour, [attached|^nodetool_cfstats.zip])
> Eventually we exceeded the number of open files:
> {code}
> ERROR [MemtableFlushWriter:286] 2015-03-12 13:44:36,748 CassandraDaemon.java:153 - Exception
in thread Thread[MemtableFlushWriter:286,5,main]
> java.lang.RuntimeException: java.io.FileNotFoundException: /mnt/cassandra/data/system/compactions_in_progress-55080ab05d9c388690a4acb25fe1f77b/system-compactions_in_progress-tmp-ka-6618-Index.db
(Too many open files)
>         at org.apache.cassandra.io.util.SequentialWriter.<init>(SequentialWriter.java:75)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.util.SequentialWriter.open(SequentialWriter.java:104)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.util.SequentialWriter.open(SequentialWriter.java:99)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.<init>(SSTableWriter.java:552)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:134)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.db.Memtable$FlushRunnable.createFlushWriter(Memtable.java:390)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.db.Memtable$FlushRunnable.writeSortedContents(Memtable.java:329)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.db.Memtable$FlushRunnable.runWith(Memtable.java:313)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.1.2.jar:2.1.2]
>         at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297)
~[guava-16.0.jar:na]
>         at org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1037)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
~[na:1.7.0_51]
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
~[na:1.7.0_51]
>         at java.lang.Thread.run(Thread.java:744) ~[na:1.7.0_51]
> Caused by: java.io.FileNotFoundException: /mnt/cassandra/data/system/compactions_in_progress-55080ab05d9c388690a4acb25fe1f77b/system-compactions_in_progress-tmp-ka-6618-Index.db
(Too many open files)
>         at java.io.RandomAccessFile.open(Native Method) ~[na:1.7.0_51]
>         at java.io.RandomAccessFile.<init>(RandomAccessFile.java:241) ~[na:1.7.0_51]
>         at org.apache.cassandra.io.util.SequentialWriter.<init>(SequentialWriter.java:71)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         ... 14 common frames omitted
> ERROR [MemtableFlushWriter:286] 2015-03-12 13:44:36,750 JVMStabilityInspector.java:94
- JVM state determined to be unstable.  Exiting forcefully due to:
> java.io.FileNotFoundException: /mnt/cassandra/data/system/compactions_in_progress-55080ab05d9c388690a4acb25fe1f77b/system-compactions_in_progress-tmp-ka-6618-Index.db
(Too many open files)
>         at java.io.RandomAccessFile.open(Native Method) ~[na:1.7.0_51]
>         at java.io.RandomAccessFile.<init>(RandomAccessFile.java:241) ~[na:1.7.0_51]
>         at org.apache.cassandra.io.util.SequentialWriter.<init>(SequentialWriter.java:71)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.util.SequentialWriter.open(SequentialWriter.java:104)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.util.SequentialWriter.open(SequentialWriter.java:99)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.<init>(SSTableWriter.java:552)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:134)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.db.Memtable$FlushRunnable.createFlushWriter(Memtable.java:390)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.db.Memtable$FlushRunnable.writeSortedContents(Memtable.java:329)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.db.Memtable$FlushRunnable.runWith(Memtable.java:313)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.1.2.jar:2.1.2]
>         at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297)
~[guava-16.0.jar:na]
>         at org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1037)
~[apache-cassandra-2.1.2.jar:2.1.2]
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
~[na:1.7.0_51]
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
~[na:1.7.0_51]
>         at java.lang.Thread.run(Thread.java:744) ~[na:1.7.0_51]
> {code}
> I restarted Cassandra and the number of SSTables reduced to 81 before increasing again...
Looking at lsof output, it seemed that the file handles for the log table were also continually
increasing. It seemed that roughly half of them [were for "tmp" files|^lsof_with_tmp.txt]
and the other half [were for the directory of the table|^lsof_without_tmp.txt]. Also of note,
it seemed we only had one compactor running on the log table, rather than the 8 that we had
seen before after changing the configuration and restarting.
> Cassandra eventually crashed again with the same error when it reached 6,442 open files
(seen in lsof). Without Cassandra running our system has 1,126 open files.



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