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From Donld Hill <dh...@eweb-service.com>
Subject Re: lucene locking
Date Thu, 16 Dec 2010 14:36:03 GMT
  So will updating to a newer version of Lucene help with the 
performance when loading DOCS. I will also do some research to see what 
is being loaded as this is a 3rd party that's using Lucene.

Can I safely upgrade to a newer version, do I need to perform any 
updates on the actual indices?
On 12/16/10 4:05 AM, Doron Cohen wrote:
>>>    I have a app that seems to be locking on some search calls. I am
>> including
>>> the stacktrace for the blocked and blocker thread.
> Is it daedlock for sure?
> No search deadlock fixes were done since 2.1.0, so perhaps it is something
> else...
>
>> "TP-Processor177" daemon prio=10 tid=0x0000002c8a96c800 nid=0x769d
>>> waiting for monitor entry [0x000000004e60a000..0x000000004e60dcb0]
>>>      java.lang.Thread.State: BLOCKED (on object monitor)
>>>           at
>> org.apache.lucene.index.SegmentReader.norms(SegmentReader.java:450)
>>>           - locked<0x0000002aa0a4f5a8>  (a
>> org.apache.lucene.index.SegmentReader)
>>
> Indeed this guy is blocked.
>
>> Here is the executing thread that is doing the blocking
> But this guy seems to be running...?
>
>> "TP-Processor97" daemon prio=10 tid=0x0000002c8fe35400 nid=0x75ce
>> runnable [0x00000000497bc000..0x00000000497bfdb0]
>>      java.lang.Thread.State: RUNNABLE
>>           at
> org.apache.lucene.index.SegmentReader.isDeleted(SegmentReader.java:346)
>>           at
> org.apache.lucene.index.IndexReader.document(IndexReader.java:368)
>>           at
> org.apache.lucene.search.IndexSearcher.doc(IndexSearcher.java:84)
>>           at org.apache.lucene.search.Hits.doc(Hits.java:104)
> Also, not sure for how many docs your app is loading like this (calling
> Hits.docs()), but documents loading is costly... is there a chance that many
> docs are being loaded and things just take long, not a deadlock?
>
> Doron
>


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