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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-23434) Spark should not warn `metadata directory` for a HDFS file path
Date Fri, 02 Mar 2018 04:42:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16383157#comment-16383157
] 

Apache Spark commented on SPARK-23434:
--------------------------------------

User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/20715

> Spark should not warn `metadata directory` for a HDFS file path
> ---------------------------------------------------------------
>
>                 Key: SPARK-23434
>                 URL: https://issues.apache.org/jira/browse/SPARK-23434
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.2, 2.1.2, 2.2.1, 2.3.0
>            Reporter: Dongjoon Hyun
>            Assignee: Dongjoon Hyun
>            Priority: Major
>             Fix For: 2.4.0
>
>
> In a kerberized cluster, when Spark reads a file path (e.g. `people.json`), it warns
with a wrong error message during looking up `people.json/_spark_metadata`. The root cause
of this istuation is the difference between `LocalFileSystem` and `DistributedFileSystem`.
`LocalFileSystem.exists()` returns `false`, but `DistributedFileSystem.exists` raises Exception.
> {code}
> scala> spark.version
> res0: String = 2.4.0-SNAPSHOT
> scala> spark.read.json("file:///usr/hdp/current/spark-client/examples/src/main/resources/people.json").show
> +----+-------+
> | age|   name|
> +----+-------+
> |null|Michael|
> |  30|   Andy|
> |  19| Justin|
> +----+-------+
> scala> spark.read.json("hdfs:///tmp/people.json")
> 18/02/15 05:00:48 WARN streaming.FileStreamSink: Error while looking for metadata directory.
> 18/02/15 05:00:48 WARN streaming.FileStreamSink: Error while looking for metadata directory.
> res6: org.apache.spark.sql.DataFrame = [age: bigint, name: string]
> {code}
> {code}
> scala> spark.version
> res0: String = 2.2.1
> scala> spark.read.json("hdfs:///tmp/people.json").show
> 18/02/15 05:28:02 WARN FileStreamSink: Error while looking for metadata directory.
> 18/02/15 05:28:02 WARN FileStreamSink: Error while looking for metadata directory.
> {code}
> {code}
> scala> spark.version
> res0: String = 2.1.2
> scala> spark.read.json("hdfs:///tmp/people.json").show
> 18/02/15 05:29:53 WARN DataSource: Error while looking for metadata directory.
> +----+-------+
> | age|   name|
> +----+-------+
> |null|Michael|
> |  30|   Andy|
> |  19| Justin|
> +----+-------+
> {code}
> {code}
> scala> spark.version
> res0: String = 2.0.2
> scala> spark.read.json("hdfs:///tmp/people.json").show
> 18/02/15 05:25:24 WARN DataSource: Error while looking for metadata directory.
> {code}



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