concurrentmergescheduller

[Radim Kolar]

i suspect that this code is broken. Lines 331 - 343 in 
org.apache.lucene.index.ConcurrentMergeScheduler.merge(IndexWriter)

mergeThreadCount() are currently active merges, they can be at most 
maxThreadCount, maxMergeCount is number of queued merges defaulted with 
maxThreadCount+2 and it can never be lower then maxThreadCount, which 
means that condition in while can never become true.

      synchronized(this) {
        long startStallTime = 0;
        while (mergeThreadCount() >= 1+maxMergeCount) {
          startStallTime = System.currentTimeMillis();
          if (verbose()) {
            message("    too many merges; stalling...");
          }
          try {
            wait();
          } catch (InterruptedException ie) {
            throw new ThreadInterruptedException(ie);
          }
        }



maxThreadCount+2;

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