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https://issues.apache.org/jira/browse/LUCENE-10025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17381172#comment-17381172
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zhangchao.es commented on LUCENE-10025:
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[~simonw] Can you please take a look?
> SoftDeletesRetentionMergePolicy#numDeletesToMerge caused indexing backlogged
> ----------------------------------------------------------------------------
>
> Key: LUCENE-10025
> URL: https://issues.apache.org/jira/browse/LUCENE-10025
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 8.4
> Reporter: zhangchao.es
> Priority: Major
> Labels: indexing, soft-delete
> Attachments: flamegraph.html, image-2021-07-14-16-52-34-740.png
>
>
> In lucene-8246, numDeletesToMerge is added in SoftDeletesRetentionMergePolicy.
> if soft deleted docs is very more, and they are also in retention lease,the
> numDeletesToMerge funcation have performance issue
> for instance，a update indexing is writing to elasticsearch, then we move one
> a shard to an other node,If the moving continues for a long time, the size of
> old shard will become very big,because soft-deleted operations need to held
> by retention lease. The more soft-deleted documents, the slower the indexing.
> if the shard size is about 20GB, we can get the below flamegraph
>
> !image-2021-07-14-16-52-34-740.png!
>
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