[jboss-jira] [JBoss JIRA] Resolved: (JGRP-1331) Digest: remove low seqno and compress highest_delivered and highest_received seqnos

[Bela Ban (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1331.
----------------------------

    Resolution: Done


Further optimizations are going to be done in 3.1

> Digest: remove low seqno and compress highest_delivered and highest_received seqnos
> -----------------------------------------------------------------------------------
>
>                 Key: JGRP-1331
>                 URL: https://issues.jboss.org/browse/JGRP-1331
>             Project: JGroups
>          Issue Type: Task
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.0
>
>
> We don't need Digest.Entry.low_seqno for NakReceiverWindow anymore. We only need it for the Retransmitter implementations. If we can remove that last dependency, e.g. by storing the last seqno removed from a retransmitter, we can remove low_seqno from a digest. This is significant, for example if we have 100 nodes, a digest includes 300 longs:(low+highest_received+highest_delivered) * 100. If we remove low_seqno, we only have 200 longs.
> Also, if we could compress the highest_delivered and highest_received seqnos, we could save even more space to send digests across the network.
> This is important for large clusters, to reduce the size of STABLE messages and views.

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