dnishimura opened a new pull request #1125: SAMZA-2286: Integrate 
MetadataStore#putAll for improved startup time.
URL: https://github.com/apache/samza/pull/1125
 
 
   This PR integrates `MetadataStore#putAll` with `TaskAssignmentManager`, 
`TaskPartitionAssignmentManager`, `ChangelogStreamManager` and 
`ZkJobCoordinator` when writing assignments to the coordinator stream. For a 
Kafka-based coordinator stream, the `putAll` method allows multiple messages to 
be produced before calling flush. We have observed in preliminary benchmark 
tests that this provides an order of magnitude improvement when calling 
`putAll` vs. `put` for each entry. The impact is faster startup times.
   
   @shanthoosh - please take a look since you have the most context.

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