hpcc-systems/HPCC-Platform — pull request #5147 by richardkchapman (2013-11-18 15:02:13+00:00)
Title: HPCC-9253 Significant semaphore overhead in the unordered concat

Fix regressions from previous commit, related to ingorrect output grouping,
and potential lockups.

Signed-off-by: Richard Chapman