[jboss-jira] [JBoss JIRA] (JGRP-1814) No physical address for X; dropping message

[Bela Ban (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1814.
----------------------------

    Resolution: Done

    
> No physical address for X; dropping message
> -------------------------------------------
>
>                 Key: JGRP-1814
>                 URL: https://issues.jboss.org/browse/JGRP-1814
>             Project: JGroups
>          Issue Type: Enhancement
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.5
>
>
> When we have view \{A,B\} and B leaves, then the following happens in UNICAST3:
> * B sends a LEAVE-REQ to A
> * A sends a LEAVE-RSP to B
> * Because the LEAVE-RSP is reliable, A keeps sending the LEAVE-RSP to B until it receives an ACK for the LEAVE-RSP
> * However, when B receives the LEAVE-RSP, it marks its connection to be acked, which means that when the next retransmission kicks in, an ACK for the LEAVE-RSP will be sent back to A
> * Before this happens, B leaves: the ACK is never sent to A
> * A keeps resending the LEAVE-RSP until {{max_retransmit_time}} (default=60s) elapses and the connection is closed. However, the connection is only closed after another 60s (default for {{conn_close_timeout}}).
> * Because the reaper removes all entries of {{logical_addr_cache}} before that happens, we're seeing the above warnings
> SOLUTION:
> # Send LEAVE-RSP unreliable. This bypasses UNICAST3 altogether. The leaver won't block forever if the LEAVE-RSP message is dropped, but only for 3 x {{GMS.leave_timeout}} ms
> # Also add a MBR_LEFT event which is sent up and down the stack by GMS when a member left *gracefully*. This allows UNICAST3 to close the connection to a given member *immediately*, stopping unneeded retransmissions to members which left.

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