[jira] [Created] (CASSANDRA-6459) Concurrency issue in Directories.getOrCreate()

["Ryan Fowler (JIRA)" <ji...@apache.org>]

Ryan Fowler created CASSANDRA-6459:
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             Summary: Concurrency issue in Directories.getOrCreate()
                 Key: CASSANDRA-6459
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6459
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: 1.2 2.0
            Reporter: Ryan Fowler


We're seeing an FSWriteError sometimes during repairs. I think it's because two threads are calling Directories.getOrCreate() on the same directory at about the same time. File.mkdirs() returns false if the directory already exists.

A patch is forthcoming.

Here's the exception we get:

ERROR 2013-12-06 09:31:45,217 [Thread-11051] CassandraDaemon Exception in thread Thread[Thread-11051,5,main]
FSWriteError in /data-1/cassandra/data/RedDeerCollege/Binaries/backups
        at org.apache.cassandra.db.Directories.getOrCreate(Directories.java:483)
        at org.apache.cassandra.db.Directories.getBackupsDirectory(Directories.java:242)
        at org.apache.cassandra.db.DataTracker.maybeIncrementallyBackup(DataTracker.java:165)
        at org.apache.cassandra.db.DataTracker.addSSTables(DataTracker.java:237)
        at org.apache.cassandra.db.ColumnFamilyStore.addSSTables(ColumnFamilyStore.java:911)
        at org.apache.cassandra.streaming.StreamInSession.closeIfFinished(StreamInSession.java:186)
        at org.apache.cassandra.streaming.IncomingStreamReader.read(IncomingStreamReader.java:138)
        at org.apache.cassandra.net.IncomingTcpConnection.stream(IncomingTcpConnection.java:238)
        at org.apache.cassandra.net.IncomingTcpConnection.handleStream(IncomingTcpConnection.java:178)

Someone else appears to have seen the same thing a while back:

Here's someone that's had a similar problem:

http://mail-archives.apache.org/mod_mbox/cassandra-user/201206.mbox/%3CA65C3B25-2866-48BE-8584-AB048663611C@thelastpickle.com%3E




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