Github user paul-rogers commented on a diff in the pull request: https://github.com/apache/drill/pull/938#discussion_r139877079 --- Diff: common/src/main/java/org/apache/drill/common/exceptions/UserException.java --- @@ -536,6 +542,33 @@ public Builder pushContext(final String name, final double value) { * @return user exception */ public UserException build(final Logger logger) { + + // To allow for debugging: + // A spinner code to make the execution stop here while the file '/tmp/drillspin' exists + // Can be used to attach a debugger, use jstack, etc + // The processID of the spinning thread should be in a file like /tmp/spin4148663301172491613.tmp --- End diff -- Would also recommend `/tmp/drill/spin...`.
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