Jacob Tolar created TEZ-4084:
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Summary: Tez local mode fails when distributed cache creates link
with parent
Key: TEZ-4084
URL: https://issues.apache.org/jira/browse/TEZ-4084
Project: Apache Tez
Issue Type: Improvement
Reporter: Jacob Tolar
If you configure distributed cache with 'target#parent/link' in Tez Local Mode,
the file cannot be created and the job fails:
{code:java}
java.lang.IllegalArgumentException: Invalid prefix or suffix
at java.nio.file.TempFileHelper.generatePath(TempFileHelper.java:63)
at java.nio.file.TempFileHelper.create(TempFileHelper.java:127)
at
java.nio.file.TempFileHelper.createTempDirectory(TempFileHelper.java:173)
at java.nio.file.Files.createTempDirectory(Files.java:950)
at
org.apache.tez.dag.app.launcher.TezLocalCacheManager.localize(TezLocalCacheManager.java:103)
{code}
I propose:
# Ensure the prefix is always valid (e.g. no path separators in it) when
creating the temporary copy of the file in TezLocalCacheManager
# Update tez local mode to behave the same way as mapreduce local mode in this
scenario. Mapreduce local mode also doesn't support these types of links (links
with a parent directory specified), but if it encounters them it is a soft
failure (WARN log message) not a job failure.
It is somewhat trickier to correctly support cache files linked with a
nonexistent parent; if that feature is required it can be done as a separate
JIRA.
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