Ankit Jain created LUCENE-8783:
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Summary: Support FST lazy loading for non-default Codecs
Key: LUCENE-8783
URL: https://issues.apache.org/jira/browse/LUCENE-8783
Project: Lucene - Core
Issue Type: New Feature
Components: core/FSTs
Environment: I used below setup for es_rally tests:
single node i3.xlarge running ES 6.5
es_rally was running on another i3.xlarge instance
Reporter: Ankit Jain
Fix For: 8.0, 8.x, master (9.0)
Currently, FST loads all the terms into heap memory during index open. This
causes frequent JVM OOM issues if the term size gets big. A better way of doing
this will be to lazily load FST using mmap. That ensures only the required
terms get loaded into memory.
Lucene can expose API for providing list of fields to load terms offheap. I'm
planning to take following approach for this:
# Add a boolean property fstOffHeap in FieldInfo
# Pass list of offheap fields to lucene during index open (ALL can be special
keyword for loading ALL fields offheap)
# Initialize the fstOffHeap property during lucene index open
# FieldReader invokes default FST constructor or OffHeap constructor based on
fstOffHeap field
I created a patch (that loads all fields offheap), did some benchmarks using
es_rally and results look good.
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