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From David Spencer <dave-lucene-u...@tropo.com>
Subject SegmentReader - Re: FieldSortedHitQueue.Comparators -- Re: force gc idiom - Re: OutOfMemory example
Date Mon, 13 Sep 2004 18:43:33 GMT

Another clue, the SegmentReaders are piling up too, which may be why the 
  Comparator map is increasing in size, because SegmentReaders are the 
keys to Comparator...though again, I don't know enough about the Lucene 
internals to know what refs to SegmentReaders are valid which which ones 
may be causing this leak.


David Spencer wrote:

> David Spencer wrote:
> 
>> Just noticed something else suspicious.
>> FieldSortedHitQueue has a field called Comparators and it seems like 
>> things are never removed from it....
> 
> 
> Replying to my own post....this could be the problem.
> If I put in a print statement here in FieldSortedHitQueue, recompile, 
> and run w/ the new jar then I see Comparators.size() go up after every 
> iteration thru ReopenTest's loop and the size() never goes down...
> 
>  static Object store (IndexReader reader, String field, int type, Object 
> factory, Object value) {
>     FieldCacheImpl.Entry entry = (factory != null)
>       ? new FieldCacheImpl.Entry (field, factory)
>       : new FieldCacheImpl.Entry (field, type);
>     synchronized (Comparators) {
>       HashMap readerCache = (HashMap)Comparators.get(reader);
>       if (readerCache == null) {
>         readerCache = new HashMap();
>         Comparators.put(reader,readerCache);
>         System.out.println( "*\t* NOW: "+ Comparators.size());
>       }
>       return readerCache.put (entry, value);
>     }
>   }
> 
>>
>>
>> Jiří Kuhn wrote:
>>
>>> This doesn't work either!
>>>
>>> Lets concentrate on the first version of my code. I believe that the 
>>> code should run endlesly (I have said it before: in version 1.4 final 
>>> it does).
>>>
>>> Jiri.
>>>
>>> -----Original Message-----
>>> From: David Spencer [mailto:dave-lucene-user@tropo.com]
>>> Sent: Monday, September 13, 2004 5:34 PM
>>> To: Lucene Users List
>>> Subject: force gc idiom - Re: OutOfMemory example
>>>
>>>
>>> Jiří Kuhn wrote:
>>>
>>>
>>>> Thanks for the bug's id, it seems like my problem and I have a 
>>>> stand-alone code with main().
>>>>
>>>> What about slow garbage collector? This looks for me as wrong 
>>>> suggestion.
>>>
>>>
>>>
>>>
>>>
>>> I've seen this written up before (javaworld?) as a way to probably 
>>> "force" GC instead of just a System.gc() call. I think the 2nd gc() 
>>> call is supposed to clean up junk from the runFinalization() call...
>>>
>>> System.gc();
>>> Thread.sleep( 100);
>>> System.runFinalization();
>>> Thread.sleep( 100);
>>> System.gc();
>>>
>>>
>>>> Let change the code once again:
>>>>
>>>> ...
>>>>    public static void main(String[] args) throws IOException, 
>>>> InterruptedException
>>>>    {
>>>>        Directory directory = create_index();
>>>>
>>>>        for (int i = 1; i < 100; i++) {
>>>>            System.err.println("loop " + i + ", index version: " + 
>>>> IndexReader.getCurrentVersion(directory));
>>>>            search_index(directory);
>>>>            add_to_index(directory, i);
>>>>            System.gc();
>>>>            Thread.sleep(1000);// whatever value you want
>>>>        }
>>>>    }
>>>> ...
>>>>
>>>> and in the 4th iteration java.lang.OutOfMemoryError appears again.
>>>>
>>>> Jiri.
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: John Moylan [mailto:johnm@rte.ie]
>>>> Sent: Monday, September 13, 2004 4:53 PM
>>>> To: Lucene Users List
>>>> Subject: Re: OutOfMemory example
>>>>
>>>>
>>>> http://issues.apache.org/bugzilla/show_bug.cgi?id=30628
>>>>
>>>> you can close the index, but the Garbage Collector still needs to 
>>>> reclaim the memory and it may be taking longer than your loop to do so.
>>>>
>>>> John
>>>>
>>>
>>>
>>>
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>>>
>>
>>
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>>
> 
> 
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> 


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