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Posted to dev@lucene.apache.org by "Ankit Jain (JIRA)" <ji...@apache.org> on 2019/04/30 00:19:00 UTC
[jira] [Updated] (LUCENE-8783) Support FST lazy loading for
non-default Codecs
[ https://issues.apache.org/jira/browse/LUCENE-8783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ankit Jain updated LUCENE-8783:
-------------------------------
Environment: (was: 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)
> 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
> Reporter: Ankit Jain
> Priority: Major
> 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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