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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-1798) FieldCacheSanityChecker called directly by FieldCache.get*
Date Tue, 25 Aug 2009 18:49:59 GMT


Michael McCandless commented on LUCENE-1798:

I think that may be over-designing things...

Ie, I'm thinking by far the most common use here is a user who can't
understand why their FieldCache memory has increased so much, and,
they want a simple & fast way to debug it.

If we switch to the InsanityMonitor API then they'll have to implement
a class w/ that interface and a chunk of code that does the for loop,
printing out details?

Is there any other use case besides "help me debug" that would merit a
programmatic API?

I suppose we could switch to InsanityMonitor but then provide a
PrintStreamInstanityMonitor impl... still seems kinda overkill though.

But I don't feel strongly.  Do you want to take a crack at it?

I think what's important here is there's a one-line means for a user
who's having problems to "turn on FieldCache debugging" and see
juicy details when insanity increases.

I agree we could make LuceneTestCase.tearDown more robust if tap into
this, though the simple infoStream could also be used for that?

> FieldCacheSanityChecker called directly by FieldCache.get*
> ----------------------------------------------------------
>                 Key: LUCENE-1798
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Hoss Man
>            Assignee: Michael McCandless
>             Fix For: 2.9
>         Attachments: LUCENE-1798.patch, LUCENE-1798.patch
> As suggested by McCandless in LUCENE-1749, we can make FieldCacheImpl a client of the
FieldCacheSanityChecker and have it sanity check itself each time it creates a new cache entry,
and log a warning if it thinks there is a problem.  (although we'd probably only want to do
this if the caller has set some sort of infoStream/warningStream type property on the FieldCache

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