[
https://issues.apache.org/jira/browse/SPARK-6016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Cheng Lian resolved SPARK-6016.
-------------------------------
Resolution: Fixed
Fix Version/s: 1.3.0
Issue resolved by pull request 4775
[https://github.com/apache/spark/pull/4775]
> Cannot read the parquet table after overwriting the existing table when
> spark.sql.parquet.cacheMetadata=true
> ------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-6016
> URL: https://issues.apache.org/jira/browse/SPARK-6016
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
> Priority: Blocker
> Fix For: 1.3.0
>
>
> saveAsTable is fine and seems we have successfully deleted the old data and
> written the new data. However, when reading the newly created table, an error
> will be thrown.
> {code}
> Error in SQL statement: java.lang.RuntimeException:
> java.lang.RuntimeException: could not merge metadata: key
> org.apache.spark.sql.parquet.row.metadata has conflicting values:
> at
> parquet.hadoop.api.InitContext.getMergedKeyValueMetaData(InitContext.java:67)
> at parquet.hadoop.api.ReadSupport.init(ReadSupport.java:84)
> at
> org.apache.spark.sql.parquet.FilteringParquetRowInputFormat.getSplits(ParquetTableOperations.scala:469)
> at
> parquet.hadoop.ParquetInputFormat.getSplits(ParquetInputFormat.java:245)
> at
> org.apache.spark.sql.parquet.ParquetRelation2$$anon$1.getPartitions(newParquet.scala:461)
> ...
> {code}
> If I set spark.sql.parquet.cacheMetadata to false, it's fine to query the
> data.
> Note: the newly created table needs to have more than one file to trigger the
> bug (if there is only a single file, we will not need to merge metadata).
> To reproduce it, try...
> {code}
> import org.apache.spark.sql.SaveMode
> import sqlContext._
> sql("drop table if exists test")
> val df1 = sqlContext.jsonRDD(sc.parallelize((1 to 10).map(i =>
> s"""{"a":$i}"""), 2)) // we will save to 2 parquet files.
> df1.saveAsTable("test", "parquet", SaveMode.Overwrite)
> sql("select * from test").collect.foreach(println) // Warm the
> FilteringParquetRowInputFormat.footerCache
> val df2 = sqlContext.jsonRDD(sc.parallelize((1 to 10).map(i =>
> s"""{"b":$i}"""), 4)) // we will save to 4 parquet files.
> df2.saveAsTable("test", "parquet", SaveMode.Overwrite)
> sql("select * from test").collect.foreach(println)
> {code}
> For this example, we have two outdated footers for df1 in footerCache and
> since we have four parquet files for the new test table, we picked up 2 new
> footers for df2. Then, we hit the bug.
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