Nick Shanin created SOLR-18554:
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Summary: 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
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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