Todd Lipcon created HDFS-4618:
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             Summary: default for checkpoint txn interval is too low
                 Key: HDFS-4618
                 URL: https://issues.apache.org/jira/browse/HDFS-4618
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.4-alpha
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


The default checkpoint interval is currently set to 40k transactions. That's 
way too low (I don't know what idiot set it to that.. oh wait, it was me...)

The old default in 1.0 is 64MB. Assuming an average of 100 bytes per txn, we 
should have the txn-count based interval default to at least 640,000. I'd like 
to change to 1M as a nice round number.

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