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https://issues.apache.org/jira/browse/SOLR-8866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cassandra Targett closed SOLR-8866.
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Resolution: Fixed
Seems this one was re-opened to backport, but never got closed again.
> UpdateLog should throw an exception when serializing unknown types
> ------------------------------------------------------------------
>
> Key: SOLR-8866
> URL: https://issues.apache.org/jira/browse/SOLR-8866
> Project: Solr
> Issue Type: Improvement
> Reporter: David Smiley
> Assignee: David Smiley
> Fix For: 6.1
>
> Attachments: SOLR_8866_UpdateLog_show_throw_for_unknown_types.patch
>
>
> When JavaBinCodec encounters a class it doesn't have explicit knowledge of
> how to serialize, nor does it implement the {{ObjectResolver}} interface, it
> currently serializes the object as the classname, colon, then toString() of
> the object.
> This may appear innocent but _not_ throwing an exception hides bugs. One
> example is that the UpdateLog, which uses JavaBinCodec, to save a document.
> The result is that this bad value winds up there, gets deserialized as a
> String in PeerSync (which uses /get) and then this value pretends to be a
> suitable value to the final document in the leader. But of course it isn't.
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