[HDFS-8117] More accurate verification in SimulatedFSDataset: replace DEFAULT_DATABYTE with patterned data

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Target Version/s: 2.8.0
• Assignee: Zhe Zhang
• Reporter: Zhe Zhang
• Created: 09/Apr/15 21:17
• Updated: 30/Aug/16 01:36
• Resolved: 15/Apr/15 15:45

Description

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.