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Tuesday, 20 November 2012
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Facebook Corona: A Different Approach to Job Scheduling and Resource Management

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Facebook engineering: Under the Hood: Scheduling MapReduce jobs more efficiently with Corona:

It was pretty clear that we would ultimately need a better scheduling framework that would improve this situation in the following ways:

  • Better scalability and cluster utilization
  • Lower latency for small jobs
  • Ability to upgrade without disruption
  • Scheduling based on actual task resource requirements rather than a count of map and reduce tasks

  1. Hadoop deployment at Facebook:

    • 100PB

    • 60000 Hive queries/day

    • used by > 1000 people

    Is Hive the preferred way Hadoop is used at Facebook?

  2. Facebook is running it’s own version of HDFS. Once you fork, integrating upstream changes becomes a nightmare.

  3. How to deploy and test new features at scale: rank types of users and roll out the new feature starting with the less critical scenarios. You must be able to correctly route traffic or users.
  4. At scale, cluster utilization is a critical metric. All the improvements in Corona are derived from this.
  5. Traditional analytic databases have advanced resource-based scheduling for a long time. Hadoop needs this.
  6. Open source at Facebook:
    1. create a tool that addresses an internal problem
    2. open source it throw it out in the wild (nb: is there any Facebook open source project they continued to maintain?)
    3. Option 1: continue to develop it internally. Option 2: drop it
    4. if by any chance the open source project survives and becomes a standalone project, catch up from time to time
    5. re-fork it
  7. why not YARN? The best answer I could find, is Joydeep Sen Sarma’s on Quora. Summarized:
    1. Corona uses a push-based, event-driven, callback oriented message flow
    2. Corona’s JobTracker can run in the same VM with the Job Client
    3. Corona integrated with the Hadoop trunk Fair-Scheduler which got rewritten at Facebook
    4. Corona’s resource manager uses optimistic locking
    5. Corona’s using Thrift, while others are looking at using Protobuf or Avro

Original title and link: Facebook Corona: A Different Approach to Job Scheduling and Resource Management (NoSQL database©myNoSQL)