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https://issues.apache.org/jira/browse/SOLR-18554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18132269#comment-18132269
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Nick Shanin commented on SOLR-18554:
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I did most of the work for this, let me know if I should share it.
> Audit IOContext hints on Directory opens in Solr core
> -----------------------------------------------------
>
> Key: SOLR-18554
> URL: https://issues.apache.org/jira/browse/SOLR-18554
> Project: Solr
> Issue Type: Improvement
> Components: Backup/Restore, replication (java)
> Reporter: Nick Shanin
> Priority: Minor
>
> Lucene's {{IOContext}} hint tells the Directory how a file will be read. Solr
> core opens many files without a specific hint, which means the default. Some
> of those files are read once, sequentially, and closed. For those reads,
> Lucene provides a hint built for single reads, and SOLR-18551 showed that the
> hint choice affects how memory-mapped reads are retained.
> This ticket covers auditing Solr core's Directory opens and applying the
> single-read hint where a file is read once. It does not cover choosing a
> different Directory implementation, and it should not change any behavior
> visible to users.
> Done when every open in solr-core has been checked for its read pattern, the
> single-read hint is applied where the pattern is one read, and the focused
> tests for backup, snapshot, replication, and core startup pass.
> AI-generated, human-reviewed text.
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