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From "Michael Hanselmann (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13067) Integer overflows with file system size reported by Amazon Elastic File System (EFS)
Date Wed, 21 Dec 2016 15:53:58 GMT
Michael Hanselmann created CASSANDRA-13067:
----------------------------------------------

             Summary: Integer overflows with file system size reported by Amazon Elastic File
System (EFS)
                 Key: CASSANDRA-13067
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13067
             Project: Cassandra
          Issue Type: Bug
         Environment: Cassandra in OpenShift running on Amazon EC2 instance with EFS mounted
for data
            Reporter: Michael Hanselmann


When not explicitly configured Cassandra uses [{{nio.FileStore.getTotalSpace}}|https://docs.oracle.com/javase/7/docs/api/java/nio/file/FileStore.html]
to determine the total amount of available space in order to [calculate the preferred commit
log size|https://github.com/apache/cassandra/blob/cassandra-3.9/src/java/org/apache/cassandra/config/DatabaseDescriptor.java#L553].
[Amazon EFS|https://aws.amazon.com/efs/] instances report a filesystem size of 8 EiB when
empty. [{{getTotalSpace}} causes an integer overflow (JDK-8162520)|https://bugs.openjdk.java.net/browse/JDK-8162520]
and returns a negative number, resulting in a negative preferred size and causing the checked
integer to throw.

Overriding {{commitlog_total_space_in_mb}} is not sufficient as [{{DataDirectory.getAvailableSpace}}|https://github.com/apache/cassandra/blob/cassandra-3.9/src/java/org/apache/cassandra/db/Directories.java#L550]
makes use of {{nio.FileStore.getUsableSpace}}.

[AMQ-6441] is a comparable issue in ActiveMQ.



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