[GitHub] ngjaying commented on issue #3208: Is state shared by function instances?

[GitBox <gi...@apache.org>]

ngjaying commented on issue #3208: Is state shared by function instances?
URL: https://github.com/apache/pulsar/issues/3208#issuecomment-448833291
 
 
   OK. I am concerned about the Read-Modify-Write scenario. For below scenario, given the initial value for state.key = "value". If the function has the below logic:
   `
   String currentValue = context.getState("key"); 
   context.putState("key", currentValue + context.getInstanceId);
   `
   If this function is run with --parallelism 2. Is this read-modify-write run like a database transaction? If not, is there a best practice for such scenario.
   

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