It saves you the hassle of closing your IndexWriter, opening an IndexReader, doing deletes, closing the IndexReader, then opening a new IndexWriter.
Also, it can be more efficient (depends on your application) since it may buffer the deletes for longer than you would if you used IndexReader. Mike Michael Zehrer <[EMAIL PROTECTED]> wrote: > Mike, > > what is the difference if I would use IndexWriter? > > Michael > > On Fri, Aug 8, 2008 at 12:27, Michael McCandless > <[EMAIL PROTECTED]> wrote: >> >> Also, can you do your deletes via IndexWriter (delete by Term) instead of >> opening IndexReader to do the deletes? >> >> Mike >> >> Ian Lea wrote: >> >>> Michael >>> >>> >>> Did you get anywhere with this? 3 secs for one delete is excessive. A >>> job of mine ran earlier today and did 2000+ deletes by term on unique >>> id in less than 9 seconds. The index is smaller, at around 5Gb, but I >>> don't believe that would explain the difference. All the deletes were >>> done in one batch using lucene 2.3.2. >>> >>> Is there a lot of other concurrent activity on the index? On the >>> server? Is it CPU or IO bound? >>> >>> >>> -- >>> Ian. >>> >>> >>> >>> On Thu, Aug 7, 2008 at 1:46 PM, Michael Zehrer <[EMAIL PROTECTED]> wrote: >>>> >>>> Dear List, >>>> >>>> I have a rather big index around 20gb. My documents have a unique id >>>> that I store in in an untokenized field. >>>> >>>> Using an IndexReader I delete documents by term using the id. The >>>> applications tries to batch as many delete operations as possible for >>>> this. >>>> >>>> The applications runs on a 8Core Machine with 1GB heapsize for the >>>> JVM. Each delete takes about 3sec to complete. I have a lot of Updates >>>> during a day so this takes a lot of time and in effect this is too >>>> slow. >>>> >>>> Is there anything I can do to speed things up a little? >>>> >>>> Best, >>>> >>>> Michael >>>> >>>> --------------------------------------------------------------------- >>>> To unsubscribe, e-mail: [EMAIL PROTECTED] >>>> For additional commands, e-mail: [EMAIL PROTECTED] >>>> >>>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: [EMAIL PROTECTED] >>> For additional commands, e-mail: [EMAIL PROTECTED] >>> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
