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https://issues.apache.org/jira/browse/DRILL-4249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15112959#comment-15112959
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Jacques Nadeau commented on DRILL-4249:
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In any case of hangs, you should capture jstack as well as jmap dump. That way
we can figure out what state the node or nodes are in.
> DROP TABLE HANGS indefinitely
> -----------------------------
>
> Key: DRILL-4249
> URL: https://issues.apache.org/jira/browse/DRILL-4249
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Flow
> Affects Versions: 1.4.0
> Environment: 4 node cluster on CentOS
> Reporter: Khurram Faraaz
>
> DROP TABLE hangs. Table was created using CTAS and the input to CTAS was a
> directory that had 2000 JSON files.
> There is no Exception or error message on sqlline prompt nor in drillbit.log
> Drill 1.4.0, git commitID: 32b85160
> hadoop fs -ls /tmp shows that the directory exists (at the time when DROP
> TABLE was hung)
> drwxr-xr-x - mapr mapr 10550677 2016-01-05 12:14 /tmp/tblMD332_wp
> {noformat}
> Snippet from drillbit.log, there's no further information after the below
> text in drillbit.log
> 2016-01-06 10:03:09,817 [297319a1-fb9d-8247-7d12-c8d551d56d2d:foreman] INFO
> o.a.drill.exec.work.foreman.Foreman - Query text for query id
> 297319a1-fb9d-8247-7d12-c8d551d56d2d: drop table tblMD332_wp
> 2016-01-06 10:03:11,516 [297319a1-fb9d-8247-7d12-c8d551d56d2d:foreman] INFO
> o.a.d.exec.store.dfs.FileSelection - FileSelection.create() took 6 ms
> 2016-01-06 10:03:11,517 [297319a1-fb9d-8247-7d12-c8d551d56d2d:foreman] INFO
> o.a.d.exec.store.dfs.FileSelection - FileSelection.getStatuses() took 0 ms,
> numFiles: 1
> {noformat}
> {noformat}
> Note that DROP TABLE commands hangs indefinitely.
> [root@centos-01 bin]# ./sqlline -u "jdbc:drill:schema=dfs.tmp -n mapr -p mapr"
> apache drill 1.4.0
> "got drill?"
> 0: jdbc:drill:schema=dfs.tmp> drop table tblMD332_wp;
> {noformat}
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