Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/672#discussion_r90268383
--- Diff: exec/java-exec/src/main/resources/drill-module.conf ---
@@ -45,7 +45,7 @@ drill.client: {
supports-complex-types: true
}
-// Directory is used as base for temporary storage of Dynamic UDF jars.
+// Directory is used as root for temporary storage of Dynamic UDF jars.
--- End diff --
Where does the user configure the suffix added to this directory to get the
temp dir for a given cluster? For example, should we have something like:
drill.cluster-temp-dir: "${drill.tmp-dir}/${drill.exec.zk.root}"
Note that tmp itself is a shared resource. If it is in /tmp, then multiple
clusters will use it. If it is in $DRILL_HOME/tmp, then still multiple clusters
will use it. Only if it is configured as $DRILL_SITE/tmp can we be guaranteed
only one cluster will use the directory (because only one cluster can use each
$DRILL_SITE dir -- that's how $DRILL_SITE is defined.)
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