Vrushali C created YARN-3650:

             Summary: Consider concurrency situations for TimelineWriter
                 Key: YARN-3650
                 URL: https://issues.apache.org/jira/browse/YARN-3650
             Project: Hadoop YARN
          Issue Type: Sub-task
            Reporter: Vrushali C

[~jrottinghuis] brought up an interesting point in YARN-3411. Filing jira to 
track to discuss and handle the following: 

For TimelineWriter and its implementations, is there an expectation set around
concurrency? Is any synchronization expected / needed to ensure visibility when 
calls happen from different threads?
How about entities, are they expected to be immutable once passed to the write 
Similarly for the constructor, we're assuming that the configuration object 
will not be modified while we're constructing a TimelineWriter?

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