InMobi/data-bus — comment on commit e304ca62f30e6413f32a09fea29c57821451d1a6
File: src/main/java/com/inmobi/databus/consume/DataConsumer.java line 47
By inders:

Since each thread tmpDir path is same for each run, a unsuccessful run can leave some data causing issues for next Run, hence cleanup is required.