The write.lock has always been to prevent multiple instances of
IndexWriter (or, IndexReader doing deletes) from operating on the
same index at a time.
Many threads sharing a single instance of these classes has always
been fine.
Mike
ajay_garg wrote:
@Mike.
Thanks for the reply. But I had thought that write.lock is there to
prevent
multiple additions/updates/deleteDocuments.
Has there been a change recently in this regard ?
Thanks
Ajay Garg
Michael McCandless-2 wrote:
That's right.
Each thread can enter IndexWriter.add/update/deleteDocument(s) in
parallel. There are some parts inside IndexWriter that are
synchronized but they are kept to a minimum to keep good thread
concurrency. As you add threads it's best to increase the RAM buffer
at the same time to get better performance.
Mike
ajay_garg wrote:
@Yonik
So you mean to say, that if two threads have the same instance of an
IndexWriter passed to both of them, and both these threads run on
two
different CPUs, then they can write to the index at the same time ?
Yonik Seeley wrote:
On Jan 30, 2008 10:59 PM, ajay_garg
<[EMAIL PROTECTED]> wrote:
Thanks Mike for your directions.
Yes, I am in fact using a single computer for my application, and
your
saying that in this case, multiple threads with a single
IndexWriter wll
give a better performance. Hmmm. I just wonder that since each
IndexWriter
has a single write.lock, this means that sitting on the CPU, we
observe
that
at a particular instant, only a single thread is using the CPU,
The write.lock is to protect against other IndexWriter instances,
*not* against other threads.
Using multiple threads on a single IndexWriter should utilize
multiple
CPUs.
-Yonik
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