Endless loop when opcount is less than threadcount

[melhindi]

Hi,
I came this by accident (forgot to change threadcount):
When opcount is set to 1 and threadcount to e.g. 2, it causes the first thread to stop after 1 operation, but the second thread runs endlessly.
This is due to the threadopcount calculation in the following lines:

YCSB/core/src/main/java/com/yahoo/ycsb/Client.java

Lines 432 to 437 in 2f03a2f

	int threadopcount = opcount / threadcount;
	// ensure correct number of operations, in case opcount is not a multiple of threadcount
	if (threadid < opcount % threadcount) {
	++threadopcount;
	}

When threadopcount is 0 the loop in ClientThread will run endlessly

YCSB/core/src/main/java/com/yahoo/ycsb/ClientThread.java

Line 116 in 2f03a2f

while (((opcount == 0) || (opsdone < opcount)) && !workload.isStopRequested()) {

I am not sure what the intended behaviour is, but I would suggest to either throw an exception (when opcount < threadcount) or alter the calculation to pass e.g. a negative opcount to those ClientThreads that will not need to issue operations.

[busbey]

Good find! Would you mind putting together a PR?

[busbey]

this was fixed in #1323