Anthony Sciola created SPARK-18098:
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Summary: Broadcast creates 1 instance / core, not 1 instance /
executor
Key: SPARK-18098
URL: https://issues.apache.org/jira/browse/SPARK-18098
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 2.0.1
Reporter: Anthony Sciola
I've created my spark executors with $SPARK_HOME/sbin/start-slave.sh -c 7 -m 55g
When I run a job which broadcasts data, it appears each *thread* requests and
receives a copy of the broadcast object, not each *executor*. This means I need
7x as much memory for the broadcasted item because I have 7 cores.
The problem appears to be due to a lack of synchronization around requesting
broadcast items.
The only workaround I've come up with is writing the data out to HDFS,
broadcasting the paths, and doing a synchronized load from HDFS.
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