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https://issues.apache.org/jira/browse/HBASE-9003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13714092#comment-13714092
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Nick Dimiduk commented on HBASE-9003:
-------------------------------------
I'm not aware of any other projects making use of it. The feature has only been
available since 0.94.6 and it's a relatively esoteric feature of job
submission. Maybe send a note to the user list asking if anyone depends on it?
If we're removing support, better sooner than later.
On the other hand, Hadoop not cleaning up after itself is a Hadoop bug, not
HBase. HBase isn't the only project interested in seeing JarFinder promoted to
a public API.
> TableMapReduceUtil should not rely on org.apache.hadoop.util.JarFinder#getJar
> -----------------------------------------------------------------------------
>
> Key: HBASE-9003
> URL: https://issues.apache.org/jira/browse/HBASE-9003
> Project: HBase
> Issue Type: Bug
> Components: mapreduce
> Affects Versions: 0.92.2, 0.95.1, 0.94.9
> Reporter: Esteban Gutierrez
>
> This is the problem: {{TableMapReduceUtil#addDependencyJars}} relies on
> {{org.apache.hadoop.util.JarFinder}} if available to call {{getJar()}}.
> However {{getJar()}} uses File.createTempFile() to create a temporary file
> under {{hadoop.tmp.dir}}{{/target/test-dir}}. Due HADOOP-9737 the created jar
> and its content is not purged after the JVM is destroyed. Since most
> configurations point {{hadoop.tmp.dir}} under {{/tmp}} the generated jar
> files get purged by {{tmpwatch}} or a similar tool, but boxes that have
> {{hadoop.tmp.dir}} pointing to a different location not monitored by
> {{tmpwatch}} will pile up a collection of jars causing all kind of issues.
> Since {{JarFinder#getJar}} is not a public API from Hadoop (see [~tucu00]
> comment on HADOOP-9737) we shouldn't use that as part of
> {{TableMapReduceUtil}} in order to avoid this kind of issues.
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