Soumava Ghosh created CASSANDRA-5830: ----------------------------------------
Summary: Paxos loops endlessly due to faulty condition check Key: CASSANDRA-5830 URL: https://issues.apache.org/jira/browse/CASSANDRA-5830 Project: Cassandra Issue Type: Bug Affects Versions: 2.0 beta 2 Reporter: Soumava Ghosh Following is the code segment (StorageProxy.java:328) which causes the issue: Start is the start time of the paxos, is always less than the current system time, and therefore the negative difference is always less than the timeout. private static UUID beginAndRepairPaxos(long start, ByteBuffer key, CFMetaData metadata, List<InetAddress> liveEndpoints, int requiredParticipants, ConsistencyLevel consistencyForPaxos) throws WriteTimeoutException { long timeout = TimeUnit.MILLISECONDS.toNanos(DatabaseDescriptor.getCasContentionTimeout()); PrepareCallback summary = null; while (start - System.nanoTime() < timeout) { long ballotMillis = summary == null ? System.currentTimeMillis() : Math.max(System.currentTimeMillis(), 1 + UUIDGen.unixTimestamp(summary.inProgressCommit.ballot)); UUID ballot = UUIDGen.getTimeUUID(ballotMillis); Here, the paxos gets stuck when PREPARE returns 'true' but with inProgressCommit. The code in StorageProxy.java:beginAndRepairPaxos() then tries to issue a PREPARE and COMMIT for the inProgressCommit, and if it repeatedly receives 'false' as a PREPARE_RESPONSE it gets stuck in an endless loop until PREPARE_RESPONSE is true. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira