Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/3380#issuecomment-65090864
Actually, I realized it might simplify this patch a lot if instead of
extending BlockManager, we extend SortShuffleManager which returns a
ShuffleBlockManager that injects a wait into getBlockData.
This way you could just do
```scala
val myConf = conf.duplicate
.set("spark.shuffle.manager", clasOf[SlowShuffleBlockManager].getName)
sc = new SparkContext(myConf)
```
rather than doing all this work creating SparkEnvs and such, which will be
annoying any time we add a new parameter to BlockManager or SparkEnv.
Note that I would also refactor this whole suite to construct a single conf
once:
`val conf = new
SparkConf().setMaster("local").setAppName("SparkListenerSuite")`
and in each test to just use
`sc = new SparkContext(conf)`
(rather than in `before`)
This would allow constructing special SparkContexts without having to have
2 simultaneously like you do with sc2.
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