Have the following error trace from running SHOW STATUS LIKE 'wsrep_%' Any idea what could cause it? 2016-12-21 3:39:24 139668819036928 [Note] InnoDB: Online DDL : End of applying row log 2016-12-21 3:39:24 139668819036928 [Note] InnoDB: Online DDL : Completed 2016-12-21 3:43:29 139668818733824 [Note] InnoDB: Online DDL : Start 2016-12-21 3:43:29 139668818733824 [Note] InnoDB: Online DDL : Start reading clustered index of the table and create temporary files 2016-12-21 03:43:29 7f072e53ab00 InnoDB: Error: Write to file (merge) failed at offset 0. InnoDB: 1048576 bytes should have been written, only 901120 were written. InnoDB: Operating system error number 12. InnoDB: Check that your OS and file system support files of this size. InnoDB: Check also that the disk is not full or a disk quota exceeded. InnoDB: Error number 12 means 'Cannot allocate memory'. InnoDB: Some operating system error numbers are described at InnoDB: http://dev.mysql.com/doc/refman/5.6/en/operating-system-error-codes.html 2016-12-21 3:43:29 139668818733824 [Note] InnoDB: Online DDL : End of reading clustered index of the table and create temporary files java.sql.SQLNonTransientConnectionException: (conn:17945) Could not read resultset: unexpected end of stream, read 0 bytes from 4 Query is : SHOW STATUS LIKE 'wsrep_%' at org.mariadb.jdbc.internal.util.ExceptionMapper.get(ExceptionMapper.java:132) at org.mariadb.jdbc.internal.util.ExceptionMapper.getException(ExceptionMapper.java:101) at org.mariadb.jdbc.internal.util.ExceptionMapper.throwAndLogException(ExceptionMapper.java:77) at org.mariadb.jdbc.MariaDbStatement.executeQueryEpilog(MariaDbStatement.java:224) at org.mariadb.jdbc.MariaDbStatement.executeInternal(MariaDbStatement.java:258) at org.mariadb.jdbc.MariaDbStatement.executeQuery(MariaDbStatement.java:371) at com.verizon.mesos.Dbcheck.getStatus(Dbcheck.java:153) at com.verizon.mesos.Dbcheck.run(Dbcheck.java:103) at com.verizon.mesos.MariadbTask.handleHealthCheck(MariadbTask.java:310) at com.verizon.mesos.MariadbTask.executeCmd(MariadbTask.java:384) at com.verizon.mesos.MariadbTask.run(MariadbTask.java:450) at com.verizon.mesos.ExecutorTask.executeCmd(ExecutorTask.java:50) at com.verizon.mesos.ExecutorTask.run(ExecutorTask.java:115) at java.lang.Thread.run(Thread.java:745)