[jira] [Created] (HDFS-7634) Lazy persist (memory) file should not support truncate currently

[Yi Liu (JIRA)]

Yi Liu created HDFS-7634:
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             Summary: Lazy persist (memory) file should not support truncate 
currently
                 Key: HDFS-7634
                 URL: https://issues.apache.org/jira/browse/HDFS-7634
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Yi Liu
            Assignee: Yi Liu


Similar with {{append}}, lazy persist (memory) file should not support truncate 
currently. Quote the reason from HDFS-6581 design doc:
{quote}
Appends to files created with the LAZY_PERSISTflag will not be allowed in the 
initial implementation to avoid the complexity of keeping in­memory and on­disk 
replicas in sync on a given DataNode.
{quote}



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