[jira] [Created] (HUDI-528) Incremental Pull fails when latest commit is empty

["Javier Vega (Jira)" <ji...@apache.org>]

Javier Vega created HUDI-528:
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             Summary: Incremental Pull fails when latest commit is empty
                 Key: HUDI-528
                 URL: https://issues.apache.org/jira/browse/HUDI-528
             Project: Apache Hudi (incubating)
          Issue Type: Bug
          Components: Incremental Pull
            Reporter: Javier Vega


When trying to create an incremental view of a dataset, an exception is thrown when the latest commit in the time range is empty. In order to determine the schema of the dataset, Hudi will grab the [latest commit file, parse it, and grab the first metadata file path|[https://github.com/apache/incubator-hudi/blob/480fc7869d4d69e1219bf278fd9a37f27ac260f6/hudi-spark/src/main/scala/org/apache/hudi/IncrementalRelation.scala#L78-L80]]. If the latest commit was empty though, the field which is used to determine file paths (partitionToWriteStats) will be empty causing the following exception:

 

 
{code:java}
java.util.NoSuchElementException
  at java.util.HashMap$HashIterator.nextNode(HashMap.java:1447)
  at java.util.HashMap$ValueIterator.next(HashMap.java:1474)
  at org.apache.hudi.IncrementalRelation.<init>(IncrementalRelation.scala:80)
  at org.apache.hudi.DefaultSource.createRelation(DefaultSource.scala:65)
  at org.apache.hudi.DefaultSource.createRelation(DefaultSource.scala:46)
  at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:318)
  at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:223)
  at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:211)
  at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:178)

{code}



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