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From Michael McCandless <>
Subject Re: Here a merge thread, there a merge thread ...
Date Fri, 24 Feb 2012 15:59:05 GMT
This is from ConcurrentMergeScheduler (the default MergeScheduler).

But, are you sure the threads are sleeping, not exiting?  (They should
be exiting).

This merge scheduler starts a new thread when a merge is needed,
allows that thread to do another merge (if one is immediately
available), else the thread exits.

Mike McCandless

On Sun, Feb 19, 2012 at 9:05 PM, Benson Margulies <> wrote:
> A long-running program of mine (which Uwe's read a model of) slowly
> keeps adding merge threads. I count 22 at the moment. Each one shows
> up, runs for a bit, and then goes to sleep for, seemingly ever. I
> don't do anything explicit to control merging behavior.
> They name themselves "Lucene Merge Thread #xxx" where xxx is a
> non-contiguous but ever-growing number.
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