[jira] [Created] (HIVE-15068) Run ClearDanglingScratchDir periodically inside HS2

["Daniel Dai (JIRA)" <ji...@apache.org>]

Daniel Dai created HIVE-15068:
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             Summary: Run ClearDanglingScratchDir periodically inside HS2
                 Key: HIVE-15068
                 URL: https://issues.apache.org/jira/browse/HIVE-15068
             Project: Hive
          Issue Type: Improvement
          Components: HiveServer2
            Reporter: Daniel Dai
            Assignee: Daniel Dai


In HIVE-13429, we introduce a tool which clear dangling scratch directory. In this ticket, we want to invoke the tool automatically on a Hive cluster. Options are:
1. cron job, which would involve manual cron job setup
2. As a metastore thread. However, it is possible we run metastore without hdfs in the future (eg, managing s3 files). ClearDanglingScratchDir needs support which only exists in hdfs, it won't work if the above scenario happens
3. As a HS2 thread. The downside is if no HS2 is running, the tool will not run automatically. But we expect HS2 will be a required component down the road

Here I choose approach 3 in the implementation.



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