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https://issues.apache.org/jira/browse/HIVE-9181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14256076#comment-14256076
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Brock Noland commented on HIVE-9181:
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You beat me to it :)
> Fix SkewJoinOptimizer related Java 8 ordering differences
> ---------------------------------------------------------
>
> Key: HIVE-9181
> URL: https://issues.apache.org/jira/browse/HIVE-9181
> Project: Hive
> Issue Type: Sub-task
> Components: Tests
> Reporter: Mohit Sabharwal
> Assignee: Mohit Sabharwal
> Attachments: HIVE-9181.1.patch, HIVE-9181.patch, HIVE-9181.patch
>
>
> (1) {{SkewJoinOptimizer}} adds items to {{ParseContext.topOps}} is different
> order in Java 8 vs Java 7. This leads to differences in EXPLAIN output
> related to {{MapWork}}.
> (2) Dbproperties order for a "desc database" query is non-deterministic at
> the HiveMetastore end between Java 8 and Java 7 (because Thrift maps are
> un-ordered).
> {code}
> create database test_db with dbproperties ('key1' = 'value1', 'key2' =
> 'value2');
> desc database extended test_db;
> {code}
> At client side, we serialize the dbproperties map returned from HMS as string
> and write it to a temp file. The {{FetchTask}} then reads the temp file and
> returns the string back to the user. In test environment, for consistent
> ordering, we should sort the map before it is serialized to the temp file.
>
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