[HDFS-1456] Provide builder for constructing instances of MiniDFSCluster

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.22.0
• Component/s: test
• Hadoop Flags: Reviewed
• Assignee: Jakob Homan
• Reporter: Jakob Homan
• Created: 14/Oct/10 00:54
• Updated: 12/Dec/11 06:20
• Resolved: 18/Oct/10 21:09

Description

Time to fix a broken window. Of the 293 occurences of "new MiniDFSCluster("... most look something like:

cluster = new MiniDFSCluster(0, config, numDatanodes, true, false, true,  null, null, null, null);

The largest constructor takes 10 parameters, and even the overloaded constructors can be difficult to read as their mainaly nulls or booleans.

We should provide a Builder for constructing MiniDFSClusters to improve readability.