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https://issues.apache.org/jira/browse/LUCENE-8391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536793#comment-16536793
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Adrien Grand commented on LUCENE-8391:
--------------------------------------
Here is a patch with two tests in {{BaseMergePolicyTestCase}}. One simulates
what happens when appending data to an index, and the other one simulates
updates that are uniformly distributed across segments based on the number of
documents that they contain. Each merge policy can decide what invariants it
wants to validate. These tests currently fail with TieredMergePolicy because of
LUCENE-8383, LUCENE-8385 and LUCENE-8392.
> Better tests for merge policies
> -------------------------------
>
> Key: LUCENE-8391
> URL: https://issues.apache.org/jira/browse/LUCENE-8391
> Project: Lucene - Core
> Issue Type: Test
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-8391.patch
>
>
> Testing merge policies was hard in the past because it could only be done by
> setting up and IndexWriter, adding documents and making sure that merges
> behave as expected. The fact that MergePolicy doesn't need an IndexWriter
> anymore (LUCENE-8330) should make things easier since we should now be able
> to simulate merges without having to create an index.
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