java - How to understand event timeline in spark? -


im trying investigate performance problem in our spark application. each of executors configured have 5 cores. here saw in stage details on event timeline:

enter image description here

the question 1 one of green rectangles lower/higher one? mean?

judging event timeline... in spite of each executors have 5 cores, of time 1 task ran in parallel. spark properties:

spark.driver.memory 4g spark.executor.instances 48 spark.executor.cores 5


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