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From Jacek Laskowski <ja...@japila.pl>
Subject [SS] Console sink not supporting recovering from checkpoint location? Why?
Date Mon, 07 Aug 2017 09:58:37 GMT
Hi,

While exploring checkpointing with kafka source and console sink I've
got the exception:

// today's build from the master
scala> spark.version
res8: String = 2.3.0-SNAPSHOT

scala> val q = records.
     |   writeStream.
     |   format("console").
     |   option("truncate", false).
     |   option("checkpointLocation", "/tmp/checkpoint"). // <--
checkpoint directory
     |   trigger(Trigger.ProcessingTime(10.seconds)).
     |   outputMode(OutputMode.Update).
     |   start
org.apache.spark.sql.AnalysisException: This query does not support
recovering from checkpoint location. Delete /tmp/checkpoint/offsets to
start over.;
  at org.apache.spark.sql.streaming.StreamingQueryManager.createQuery(StreamingQueryManager.scala:222)
  at org.apache.spark.sql.streaming.StreamingQueryManager.startQuery(StreamingQueryManager.scala:278)
  at org.apache.spark.sql.streaming.DataStreamWriter.start(DataStreamWriter.scala:284)
  ... 61 elided

The "trigger" is the change
https://issues.apache.org/jira/browse/SPARK-16116 and this line in
particular https://github.com/apache/spark/pull/13817/files#diff-d35e8fce09686073f81de598ed657de7R277.

Why is this needed? I can't think of a use case where console sink
could not recover from checkpoint location (since all the information
is available). I'm lost on it and would appreciate some help (to
recover :))

Pozdrawiam,
Jacek Laskowski
----
https://medium.com/@jaceklaskowski/
Mastering Apache Spark 2 https://bit.ly/mastering-apache-spark
Follow me at https://twitter.com/jaceklaskowski

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