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https://issues.apache.org/jira/browse/SOLR-9915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15795803#comment-15795803
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ASF subversion and git services commented on SOLR-9915:
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Commit 122fa6cf64a56dd5ab5aff84f7f5c9a1305bde4e in lucene-solr's branch
refs/heads/branch_6x from [~noble.paul]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=122fa6c ]
SOLR-9915: PeerSync alreadyInSync check is not backwards compatible and results
in full replication during a rolling restart
> PeerSync alreadyInSync check is not backwards compatible
> --------------------------------------------------------
>
> Key: SOLR-9915
> URL: https://issues.apache.org/jira/browse/SOLR-9915
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: replication (java)
> Affects Versions: 6.3
> Reporter: Tim Owen
> Assignee: Noble Paul
> Priority: Blocker
> Attachments: SOLR-9915.patch
>
>
> The fingerprint check added to PeerSync in SOLR-9446 works fine when all
> servers are running 6.3 but this means it's hard to do a rolling upgrade from
> e.g. 6.2.1 to 6.3 because the 6.3 server sends a request to a 6.2.1 server to
> get a fingerprint and then gets a NPE because the older server doesn't return
> the expected field in its response.
> This leads to the PeerSync completely failing, and results in a full index
> replication from scratch, copying all index files over the network. We
> noticed this happening when we tried to do a rolling upgrade on one of our
> 6.2.1 clusters to 6.3. Unfortunately this amount of replication was hammering
> our disks and network, so we had to do a full shutdown, upgrade all to 6.3
> and restart, which was not ideal for a production cluster.
> The attached patch should behave more gracefully in this situation, as it
> will typically return false for alreadyInSync() and then carry on doing the
> normal re-sync based on versions.
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