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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8117) More accurate verification in SimulatedFSDataset: replace DEFAULT_DATABYTE with patterned data
Date Mon, 13 Apr 2015 19:59:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492976#comment-14492976
] 

Zhe Zhang commented on HDFS-8117:
---------------------------------

Thanks for the reviews Andrew, Colin, and Kai!

> 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
>         Attachments: HDFS-8117.000.patch, HDFS-8117.001.patch, HDFS-8117.002.patch, HDFS-8117.003.patch
>
>
> 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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