Mathieu DESPRIEE created SPARK-23220:
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Summary: broadcast hint not applied in a streaming left anti join
Key: SPARK-23220
URL: https://issues.apache.org/jira/browse/SPARK-23220
Project: Spark
Issue Type: Bug
Components: Structured Streaming
Affects Versions: 2.2.1
Reporter: Mathieu DESPRIEE
Attachments: Screenshot from 2018-01-25 17-32-45.png
We have a structured streaming app doing a left anti-join between a stream, and
a static dataframe. This one is quite small (a few 100s of rows), but he query
plan by default is a sort merge join.
It happens sometimes we need to re-process some historical data, so we feed the
same app with a FileSource pointing to our S3 storage with all archives. In
that situation, the first mini-batch is quite heavy (several 100'000s of input
files), and the time spent in sort-merge join is non-acceptable.
I tried to switch to a broadcast join, but Spark still apply a sort-merge.
{noformat}
ds.join(broadcast(hostnames), Seq("hostname"), "leftanti")
{noformat}
Looks like a bug. Is there another way to force the broadcast ?
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