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https://issues.apache.org/jira/browse/CAMEL-24930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18118342#comment-18118342
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Claus Ibsen commented on CAMEL-24930:
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Do NOT create blocker tickets!
> Resequence EIP docs say the last of duplicate messages is kept, but the first
> one is kept
> -----------------------------------------------------------------------------------------
>
> Key: CAMEL-24930
> URL: https://issues.apache.org/jira/browse/CAMEL-24930
> Project: Camel
> Issue Type: Task
> Components: camel-core
> Reporter: shashank
> Priority: Blocker
>
> {{resequence-eip.adoc}} says: "By default, the Resequencer does not support
> duplicate messages and will only keep the last message, in case a message
> arrives with the same message expression." The "Allow Duplicates" section
> repeats this ("instead of keeping only the last duplicated message").
> Both resequencers keep the *first* message and drop the later ones:
> * Batch: {{Resequencer.createSet}} uses a {{TreeSet}}, which ignores an
> element equal to one it already holds.
> {{BatchResequencerWithDuplicateTest.testBatchResequencerNoDuplicate}} sends
> A(1), C(2), D(2), F(4), B(1), E(3) and asserts A, C, E, F.
> * Stream: {{ResequencerEngine.insert}} calls {{sequence.add(element)}} on a
> {{TreeSet}} as well. Sending B(2), A1(1), A2(1) to
> {{resequence(header("seqno")).stream()}} delivers A1, B. A2 is dropped.
> Proposed fix: correct the two sentences in the docs (the code behaviour is
> covered by an existing test, so it is the docs that are wrong), and add a
> test for the stream mode.
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