[jboss-jira] [JBoss JIRA] Updated: (JGRP-1251) NAKACK: overwriteDigest() doesn't adjust sequence number

[Bela Ban (JIRA)]

     [ https://jira.jboss.org/browse/JGRP-1251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban updated JGRP-1251:
---------------------------

    Attachment:     (was: tmp.xml)


> NAKACK: overwriteDigest() doesn't adjust sequence number
> --------------------------------------------------------
>
>                 Key: JGRP-1251
>                 URL: https://jira.jboss.org/browse/JGRP-1251
>             Project: JGroups
>          Issue Type: Bug
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.10.2, 2.11.1, 2.12
>
>         Attachments: GroupCommunication.java, tmp.xml, ViewHandler.java, ViewHandler.java
>
>
> NAKACK.overwriteDigest() is used by the 2 state transfer protocols (STATE_TRANSFER and STREAMING_STATE_TRANSFER).
> When A has a digest A:250,B:10,C:160, and gets the state (as a result of calling JChannel.getState() with a digest of A:230,B:10,C:160, it'll set its own digest to A:230 (from A:250). 
> However, A's sequence number (seqno) will remain at 250 ! This means, when A sends the next message, it'll send A:251, but because we set the digest to A:230, A will ask itself to retransmit messages A:230-250 !
> SOLUTION: when receiving digest A:230, A should set its seqno to 230
> WORKAROUND: use FLUSH, which doesn't ship digests on state transfer

-- 
This message is automatically generated by JIRA.
-
For more information on JIRA, see: http://www.atlassian.com/software/jira