Difference between a phase and checkpoint as far as i know it something related with how temporary files containing the data landed to disk is handled. that is phases are used to break up a graph so that it does not use up all the memory , it reduce the no of component running in parallel hence improves the performances (used for performance fine tuning, by managing the resource in perfect manner)
Check points are used for the purpose of recovery.
Total Answers and Comments: 3
Last Update: November 16, 2008 Asked by: sixto.dsilva
Phase is a stage in a graph that runs before staratup of next stage. Check point is intermediate stoping point of the graph to save guard against failure. We can arrange phase without check points. We dont assign checkpoint without phases.
The major difference between these to is that phasing deletes the intermediate files made at the end of each phase, as soon as it enters the next phase. On the other hand, what checkpointing does is...it stores these intermediate files till the end of the graph. Thus we can easily use the intermediate file to restart the process from where it failed. But this cannot be done in case of phasing.
