Re: MMR Dead-Lock

Rich Megginson <rmeggins@xxxxxxxxxx> · Fri, 7 Aug 2015 14:18:04 -0600



    On 08/06/2015 05:20 PM, Joel Levin
      wrote:

    
      The 389 plug-in was enabled yesterday
    
    
    What is the "389 plug-in" - do you mean the DNA plugin?

    
       - we think the deadlock it is similar to case
        below:

        
          http://comments.gmane.org/gmane.linux.redhat.fedora.directory.user/15775

          
        DNA plug-in has now been disabled - we are monitoring and
          will update the list.

        
    See also https://fedorahosted.org/389/ticket/47409

    
        On Thu, Aug 6, 2015 at 3:23 PM, Joel
          Levin <joel.aaron.levin@xxxxxxxxx>
          wrote:

          
              Hi List:

                
              We have a multi-master set-up: 1 Primary Master, 1 Cold
              Master, 3 Consumers.

              
                  All usually humming well - however today, there
                    were a number of deadlocks - like below - 2 of which
                    brought the 1 Primary Master (example below from
                    'error' logs resulted in master going offline).

                    
                  Any ideas on where to look on what could have
                    caused the deadlock and the subsequent taking
                    offline of the Primary Master?

                    
                  Thanks.

                  
                    [06/Aug/2015:14:17:22 -0700] eldapubcpostop_mod -
                    20150806141722[06/Aug/2015:14:17:22 -0700]
                    NSMMReplicationPlugin - agmt="cn=eldap2"
                    (eldap2:636): Consumer failed to replay cha

                    nge (uniqueid 67c49201-3c6411e5-97f8dfeb-4acc1d05,
                    CSN 55c3cee4000000010000): Protocol error (2). Will
                    retry later.

                    [06/Aug/2015:14:17:22 -0700] NSMMReplicationPlugin -
                    agmt="cn=eldap3" (eldap3:636): Consumer failed to
                    replay change (uniqueid
                    67c49201-3c6411e5-97f8dfeb-4acc1d05, CSN 55c3cee40

                    00000010000): Protocol error (2). Will retry later.

                    [06/Aug/2015:14:17:23 -0700] eldapubcpostop_mod -
                    Opened database successfully

                    [06/Aug/2015:14:17:23 -0700] eldapubcpostop_mod -
                    20150806141723[06/Aug/2015:14:17:23 -0700]
                    eldapubcpostop_mod - Opened database successfully

                    [06/Aug/2015:14:17:23 -0700] eldapubcpostop_mod -
                    20150806141723[06/Aug/2015:14:20:17 -0700]
                    NSMMReplicationPlugin - changelog program -
                    _cl5WriteOperationTxn: retry (49) the tr

                    ansaction (csn=55c3cf8e000000010000) failed
                    (rc=-30994 (DB_LOCK_DEADLOCK: Locker killed to
                    resolve a deadlock))

                    [06/Aug/2015:14:20:17 -0700] NSMMReplicationPlugin -
                    changelog program - _cl5WriteOperationTxn: failed to
                    write entry with csn (55c3cf8e000000010000); db
                    error - -30994 DB_LOCK_

                    DEADLOCK: Locker killed to resolve a deadlock

                    [06/Aug/2015:14:20:17 -0700] NSMMReplicationPlugin -
                    write_changelog_and_ruv: can't add a change for
                    uid=foobar,ou=org,dc=example,dc=com (uniqid:
                    e62f2d01-3c8011e5-

                    a838dfeb-4acc1d05, optype: 16) to changelog csn
                    55c3cf8e000000010000

                  
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