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  1. JBoss Enterprise Application Platform 4 and 5
  2. JBPAPP-7463 Upgrade JGroups to 2.6.22
  3. JBPAPP-9344

NAKACK retransmission request for message 0

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    • Affects:
      Release Notes
    • Release Notes Text:
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      When requesting missing messages to be retransmitted, a node sometimes requested the latest received message instead of the missing one. If if had not previously received any messages from the member in these cases, it requested message 0 (which is invalid). This behaviour caused unnecessary retransmission requests and the following warning messages were logged:

      <screen>
      WARN [org.jgroups.protocols.pbcast.NAKACK] (OOB-19,10.1.1.1:55200) (requester=10.1.1.2:55200, local_addr=10.1.1.1:55200) message 10.1.1.1:55200::0 not found in retransmission table of 10.1.1.1:55200:
      [0 : 7 (7) (size=7, missing=0, highest stability=0)]
      </screen>

      With this update, JGroups do not request retransmission of message 0 or a message it already has received. As a result, no redundant retransmission requests are sent and the above mentioned warning messages are not logged.
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      When requesting missing messages to be retransmitted, a node sometimes requested the latest received message instead of the missing one. If if had not previously received any messages from the member in these cases, it requested message 0 (which is invalid). This behaviour caused unnecessary retransmission requests and the following warning messages were logged: <screen> WARN [org.jgroups.protocols.pbcast.NAKACK] (OOB-19,10.1.1.1:55200) (requester=10.1.1.2:55200, local_addr=10.1.1.1:55200) message 10.1.1.1:55200::0 not found in retransmission table of 10.1.1.1:55200: [0 : 7 (7) (size=7, missing=0, highest stability=0)] </screen> With this update, JGroups do not request retransmission of message 0 or a message it already has received. As a result, no redundant retransmission requests are sent and the above mentioned warning messages are not logged.
    • Release Notes Docs Status:
      Documented as Resolved Issue
    • Docs QE Status:
      NEW

      Description

      The following warning is logged. Since there is no message with ID 0, it should not be requested for retransmission.

      WARN [org.jgroups.protocols.pbcast.NAKACK] (OOB-19,10.1.1.1:55200) (requester=10.1.1.2:55200, local_addr=10.1.1.1:55200) message 10.1.1.1:55200::0 not found in retransmission table of 10.1.1.1:55200:
      [0 : 7 (7) (size=7, missing=0, highest stability=0)]

      It occurred during a FLUSH when a node is trying to join the cluster, in a network that is dropping some multicast packets.

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            Bug - A problem which impairs or prevents the functions of the product. JGRP-1480 NAKACK retransmission request for message 0

            • Major - A request that should be considered seriously but is not a show stopper.
            • Resolved

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                • Assignee:
                  dereed Dennis Reed
                  Reporter:
                  dereed Dennis Reed
                  Writer:
                  Petr Penicka
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                  • Created:
                    Updated:
                    Resolved: