[jira] [Created] (HDFS-4305) Add a configurable limit on number of blocks per file, and min block size

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Todd Lipcon created HDFS-4305:
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             Summary: Add a configurable limit on number of blocks per file, and min block size
                 Key: HDFS-4305
                 URL: https://issues.apache.org/jira/browse/HDFS-4305
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.2-alpha, 1.0.4, 3.0.0
            Reporter: Todd Lipcon
            Priority: Minor


We recently had an issue where a user set the block size very very low and managed to create a single file with hundreds of thousands of blocks. This caused problems with the edit log since the OP_ADD op was so large (HDFS-4304). I imagine it could also cause efficiency issues in the NN. To prevent users from making such mistakes, we should:
- introduce a configurable minimum block size, below which requests are rejected
- introduce a configurable maximum number of blocks per file, above which requests to add another block are rejected (with a suitably high default as to not prevent legitimate large files)

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