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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8117) More accurate verification in SimulatedFSDataset: replace DEFAULT_DATABYTE with patterned data
Date Thu, 09 Apr 2015 21:18:12 GMT
Zhe Zhang created HDFS-8117:
-------------------------------

             Summary: More accurate verification in SimulatedFSDataset: replace DEFAULT_DATABYTE
with patterned data
                 Key: HDFS-8117
                 URL: https://issues.apache.org/jira/browse/HDFS-8117
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Zhe Zhang
            Assignee: Zhe Zhang


Currently {{SimulatedFSDataset}} uses a single {{DEFAULT_DATABYTE}} to simulate _all_ block
content. This is not accurate because the return of this byte just means the read request
has hit an arbitrary position in an arbitrary simulated block.

This JIRA aims to improve it with a more accurate verification. When position {{p}} of a simulated
block {{b}} is accessed, the returned byte is {{b}}'s block ID plus {{p}}, moduled by the
max value of a byte.



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