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https://issues.apache.org/jira/browse/FLINK-20267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17237163#comment-17237163
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Dian Fu commented on FLINK-20267:
---------------------------------
[~karmagyz] Could you help to take a look at this issue?
> JaasModule prevents Flink from starting if working directory is a symbolic
> link
> -------------------------------------------------------------------------------
>
> Key: FLINK-20267
> URL: https://issues.apache.org/jira/browse/FLINK-20267
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.12.0
> Reporter: Till Rohrmann
> Priority: Blocker
> Fix For: 1.12.0
>
>
> [~AHeise] reported that starting Flink on EMR fails with
> {code}
> java.lang.RuntimeException: unable to generate a JAAS configuration file
> at
> org.apache.flink.runtime.security.modules.JaasModule.generateDefaultConfigFile(JaasModule.java:170)
> at
> org.apache.flink.runtime.security.modules.JaasModule.install(JaasModule.java:94)
> at
> org.apache.flink.runtime.security.SecurityUtils.installModules(SecurityUtils.java:78)
> at
> org.apache.flink.runtime.security.SecurityUtils.install(SecurityUtils.java:59)
> at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1045)
> Caused by: java.nio.file.FileAlreadyExistsException: /tmp
> at
> sun.nio.fs.UnixException.translateToIOException(UnixException.java:88)
> at
> sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
> at
> sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
> at
> sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:384)
> at java.nio.file.Files.createDirectory(Files.java:674)
> at java.nio.file.Files.createAndCheckIsDirectory(Files.java:781)
> at java.nio.file.Files.createDirectories(Files.java:727)
> at
> org.apache.flink.runtime.security.modules.JaasModule.generateDefaultConfigFile(JaasModule.java:162)
> ... 4 more
> {code}
> The problem is that on EMR {{/tmp}} is a symbolic link. Due to FLINK-19252
> where we introduced the [creation of the working
> directory|https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/security/modules/JaasModule.java#L162]
> in order to create the default Jaas config file, the start up process fails
> if the path for the working directory is not a directory (apparently
> {{Files.createDirectories}} cannot deal with symbolic links).
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