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https://issues.apache.org/jira/browse/SPARK-23551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438208#comment-16438208
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Sergey Serebryakov commented on SPARK-23551:
--------------------------------------------
Thank you [~dongjoon]! This was also affecting our Spark job performance!
We're using \{{mapreduce.fileoutputcommitter.algorithm.version=2}} in our Spark
job config, as recommended e.g. here:
[http://spark.apache.org/docs/latest/cloud-integration.html]. We're using
user-provided Hadoop 2.9.0.
However, since this 2.6.5 JAR was in spark/jars, it was given priority in the
classpath over Hadoop-distributed 2.9.0 JAR. The 2.6.5 was silently ignoring
the \{{mapreduce.fileoutputcommitter.algorithm.version}} setting and used the
default, slow algorithm (I believe hadoop-mapreduce-client-core only had one,
slow, algorithm until 2.7.0).
I believe this affects everyone who uses any mapreduce settings with Spark
2.3.0. Great job!
> Exclude `hadoop-mapreduce-client-core` dependency from `orc-mapreduce`
> ----------------------------------------------------------------------
>
> Key: SPARK-23551
> URL: https://issues.apache.org/jira/browse/SPARK-23551
> Project: Spark
> Issue Type: Bug
> Components: Build
> Affects Versions: 2.3.0
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Priority: Minor
> Fix For: 2.3.1, 2.4.0
>
>
> This issue aims to prevent `orc-mapreduce` dependency from making IDEs and
> maven confused.
> *BEFORE*
> Please note that 2.6.4 at Spark Project SQL.
> {code}
> $ mvn dependency:tree -Phadoop-2.7
> -Dincludes=org.apache.hadoop:hadoop-mapreduce-client-core
> ...
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Building Spark Project Catalyst 2.4.0-SNAPSHOT
> [INFO]
> ------------------------------------------------------------------------
> [INFO]
> [INFO] --- maven-dependency-plugin:3.0.2:tree (default-cli) @
> spark-catalyst_2.11 ---
> [INFO] org.apache.spark:spark-catalyst_2.11:jar:2.4.0-SNAPSHOT
> [INFO] \- org.apache.spark:spark-core_2.11:jar:2.4.0-SNAPSHOT:compile
> [INFO] \- org.apache.hadoop:hadoop-client:jar:2.7.3:compile
> [INFO] \-
> org.apache.hadoop:hadoop-mapreduce-client-core:jar:2.7.3:compile
> [INFO]
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Building Spark Project SQL 2.4.0-SNAPSHOT
> [INFO]
> ------------------------------------------------------------------------
> [INFO]
> [INFO] --- maven-dependency-plugin:3.0.2:tree (default-cli) @ spark-sql_2.11
> ---
> [INFO] org.apache.spark:spark-sql_2.11:jar:2.4.0-SNAPSHOT
> [INFO] \- org.apache.orc:orc-mapreduce:jar:nohive:1.4.3:compile
> [INFO] \- org.apache.hadoop:hadoop-mapreduce-client-core:jar:2.6.4:compile
> {code}
> *AFTER*
> {code}
> $ mvn dependency:tree -Phadoop-2.7
> -Dincludes=org.apache.hadoop:hadoop-mapreduce-client-core
> ...
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Building Spark Project Catalyst 2.4.0-SNAPSHOT
> [INFO]
> ------------------------------------------------------------------------
> [INFO]
> [INFO] --- maven-dependency-plugin:3.0.2:tree (default-cli) @
> spark-catalyst_2.11 ---
> [INFO] org.apache.spark:spark-catalyst_2.11:jar:2.4.0-SNAPSHOT
> [INFO] \- org.apache.spark:spark-core_2.11:jar:2.4.0-SNAPSHOT:compile
> [INFO] \- org.apache.hadoop:hadoop-client:jar:2.7.3:compile
> [INFO] \-
> org.apache.hadoop:hadoop-mapreduce-client-core:jar:2.7.3:compile
> [INFO]
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Building Spark Project SQL 2.4.0-SNAPSHOT
> [INFO]
> ------------------------------------------------------------------------
> [INFO]
> [INFO] --- maven-dependency-plugin:3.0.2:tree (default-cli) @ spark-sql_2.11
> ---
> [INFO] org.apache.spark:spark-sql_2.11:jar:2.4.0-SNAPSHOT
> [INFO] \- org.apache.spark:spark-core_2.11:jar:2.4.0-SNAPSHOT:compile
> [INFO] \- org.apache.hadoop:hadoop-client:jar:2.7.3:compile
> [INFO] \-
> org.apache.hadoop:hadoop-mapreduce-client-core:jar:2.7.3:compile
> {code}
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