[jira] [Created] (HADOOP-16343) Add option for a prefix to put in front of every s3guard table

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created HADOOP-16343:
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             Summary: Add option for a prefix to put in front of every s3guard table
                 Key: HADOOP-16343
                 URL: https://issues.apache.org/jira/browse/HADOOP-16343
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: 3.2.0
            Reporter: Steve Loughran


with DDB on demand, there's no cost in $ to having a table per bucket, and some security isolation benefits. But if you tell applications they can create DDB tables for every s3 bucket they encounter, their names may clash with other DDB tables, and it becomes hard to identify which tables in a region are s3. 

Proposed: add a fs.s3a.s3guard.table.prefix option which lets you define the prefix to put in front of any inferred table name, so providing the isolation

note, AWS [DDB naming rules|https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.NamingRulesDataTypes.html] put a limit of 255 chars; table prefix should short, e.g. "s3a."



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