apache/spark — pull request #1700 by mengxr (2014-07-31 20:16:59+00:00)
Title: [SPARK-2777][MLLIB] change ALS factors storage level to MEMORY_AND_DISK

Now the factors are persisted in memory only. If they get kicked off by later jobs, we might have to start the computation from very beginning. A better solution is changing the storage level to `MEMORY_AND_DISK`.

@srowen