Github user iven commented on the pull request:
https://github.com/apache/spark/pull/60#issuecomment-36484214
If checkpoint is enabled both in spark and Mesos slaves, the slaves will
write spark and executors information periodically to the disk. Yes, it's used
for Spark to survive slave restarts.
The reason why it's not enabled by default is, if checkpoint is enabled,
spark will only receive offers from checkpointing slaves.
See here for details:
http://mesos.apache.org/documentation/latest/slave-recovery/
Hadoop and Storm framework both get it disabled by default:
https://github.com/mesos/hadoop/blob/master/configuration.md
https://github.com/mesosphere/storm-mesos/blob/master/storm.yaml
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