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https://issues.apache.org/jira/browse/SPARK-22519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16251925#comment-16251925
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Devaraj K commented on SPARK-22519:
-----------------------------------
It is not an usual case, I have seen this NPE while working SPARK-22404 when
the SPARK_YARN_STAGING_DIR env doesn't exist. If you don't think to have a null
check for env, atleast the *if (stagingDirPath == null) {* is never used.
> ApplicationMaster.cleanupStagingDir() throws NPE when SPARK_YARN_STAGING_DIR
> env var is not available
> -----------------------------------------------------------------------------------------------------
>
> Key: SPARK-22519
> URL: https://issues.apache.org/jira/browse/SPARK-22519
> Project: Spark
> Issue Type: Improvement
> Components: YARN
> Affects Versions: 2.2.0
> Reporter: Devaraj K
> Priority: Minor
>
> In the below, the condition checks whether the stagingDirPath is null but
> stagingDirPath never becomes null. If SPARK_YARN_STAGING_DIR env var is null
> then it throws NPE while creating the Path.
> {code:title=ApplicationMaster.scala|borderStyle=solid}
> stagingDirPath = new Path(System.getenv("SPARK_YARN_STAGING_DIR"))
> if (stagingDirPath == null) {
> logError("Staging directory is null")
> return
> }
> {code}
> Here we need to check whether the System.getenv("SPARK_YARN_STAGING_DIR") is
> null or not, not the stagingDirPath.
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