use-broadcast | React hook to sync state | Frontend Utils library
kandi X-RAY | use-broadcast Summary
kandi X-RAY | use-broadcast Summary
React hook to sync state between browser tabs of the same origin
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QUESTION
:)
I'd like to say that I'm new in Spark, as many of these posts start..but the truth is I'm not that new. Still, I'm facing this issue with broadcast variables.
When a variable is broadcast, each executor receives a copy of it. Later on, when this variable is referenced in the part of the code that is executed in the executors (let's say map or foreach), if the variable reference that was set in the driver is not passed to it, the executor does not know what are we talking about. Which I think is perfectly explain here
My problem is I am getting a nullPointerException even tough I passed the broadcast reference to the executors.
...ANSWER
Answered 2020-May-05 at 17:00RDD and DataFrames are already distributed structures, no need to broadcast them as local variable .(org.apache.spark.sql.functions.broadcast()
function (which is used while doing joins) is not local variable broadcast )
Even if you try the code syntax wise it wont show any compilation error, rather it will throw RuntimeException
like NullPointerException
which is 100% valid.
Example to Explain the behavior :
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