lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ankit Jain (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-8783) Support FST lazy loading for non-default Codecs
Date Tue, 30 Apr 2019 00:20:00 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-8783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ankit Jain updated LUCENE-8783:
-------------------------------
    Lucene Fields: New  (was: New,Patch Available)

> 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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message