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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2011/06/18 18:23:47 UTC
[jira] [Created] (LUCENE-3214) Ability to mlock certain fields from
the terms dict
Ability to mlock certain fields from the terms dict
---------------------------------------------------
Key: LUCENE-3214
URL: https://issues.apache.org/jira/browse/LUCENE-3214
Project: Lucene - Java
Issue Type: Improvement
Reporter: Michael McCandless
This is a hacked up prototype! It works but I'm not sure how to get this to a committable point.
The patch invokes mlock() (tested only on Linux), locking pages from the terms dictionary file that hold terms for a specified field. You can only do this with MMapDirectory.
I used this to lock pages for the "id" field in the NRT stress test; it's an alternative to MemoryCodec. But, it requires you set up the OS to allow the app/user to lock pages in RAM.
It works very well in reducing the NRT reopen latency even when large merges are running...
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[jira] [Updated] (LUCENE-3214) Ability to mlock certain fields from
the terms dict
Posted by "Michael McCandless (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-3214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless updated LUCENE-3214:
---------------------------------------
Attachment: LUCENE-3214.patch
Prototype hacked up but working patch.
> Ability to mlock certain fields from the terms dict
> ---------------------------------------------------
>
> Key: LUCENE-3214
> URL: https://issues.apache.org/jira/browse/LUCENE-3214
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Attachments: LUCENE-3214.patch
>
>
> This is a hacked up prototype! It works but I'm not sure how to get this to a committable point.
> The patch invokes mlock() (tested only on Linux), locking pages from the terms dictionary file that hold terms for a specified field. You can only do this with MMapDirectory.
> I used this to lock pages for the "id" field in the NRT stress test; it's an alternative to MemoryCodec. But, it requires you set up the OS to allow the app/user to lock pages in RAM.
> It works very well in reducing the NRT reopen latency even when large merges are running...
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