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https://issues.apache.org/jira/browse/CASSANDRA-283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12729676#action_12729676
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Jun Rao commented on CASSANDRA-283:
-----------------------------------
There exists code in get_slice() that closes all files it opens at the end.
Could you describe your scenario a bit more? Are you just issuing get_slice
calls? How many requests were issued?
> Cassandra leaks FDs
> -------------------
>
> Key: CASSANDRA-283
> URL: https://issues.apache.org/jira/browse/CASSANDRA-283
> Project: Cassandra
> Issue Type: Bug
> Environment: Debian Etch, J2SE 1.6.0
> Reporter: Ian Eure
>
> Cassandra leaks file descriptors like crazy. I started getting these errors
> after a few hours of uptime:
> java.lang.RuntimeException: java.io.FileNotFoundException:
> /var/cassandra/data/Digg-Items-2-Data.db (Too many open files)
> at
> org.apache.cassandra.service.CassandraServer.readColumnFamily(CassandraServer.java:84)
> at
> org.apache.cassandra.service.CassandraServer.get_slice(CassandraServer.java:181)
> at
> org.apache.cassandra.service.Cassandra$Processor$get_slice.process(Cassandra.java:859)
> at
> org.apache.cassandra.service.Cassandra$Processor.process(Cassandra.java:817)
> at
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:252)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:619)
> Caused by: java.io.FileNotFoundException:
> /var/cassandra/data/Digg-Items-2-Data.db (Too many open files)
> at java.io.RandomAccessFile.open(Native Method)
> at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
> at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
> at
> org.apache.cassandra.io.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:141)
> at
> org.apache.cassandra.io.SequenceFile$BufferReader.init(SequenceFile.java:811)
> at
> org.apache.cassandra.io.SequenceFile$Reader.<init>(SequenceFile.java:743)
> at
> org.apache.cassandra.io.SequenceFile$BufferReader.<init>(SequenceFile.java:805)
> at
> org.apache.cassandra.io.SequenceFile$ColumnGroupReader.<init>(SequenceFile.java:248)
> at
> org.apache.cassandra.io.SSTableReader.getColumnGroupReader(SSTableReader.java:346)
> at
> org.apache.cassandra.db.SSTableColumnIterator.<init>(ColumnIterator.java:61)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getSliceFrom(ColumnFamilyStore.java:1589)
> at org.apache.cassandra.db.Table.getRow(Table.java:596)
> at
> org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:60)
> at
> org.apache.cassandra.service.StorageProxy.weakReadLocal(StorageProxy.java:600)
> at
> org.apache.cassandra.service.StorageProxy.readProtocol(StorageProxy.java:303)
> at
> org.apache.cassandra.service.CassandraServer.readColumnFamily(CassandraServer.java:80)
> I have an open file limit of 1024. Examining the lsof output for Cassandra
> shows 975 FDs for the same file: /var/cassandra/data/Digg-Items-2-Data.db
> Clearly, these FDs are leaking somewhere.
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