[HBASE-19432] Roll the specified writer in HFileOutputFormat2

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1, 2.0.0-beta-1
• Fix Version/s: 2.0.0-beta-1, 2.0.0
• Hadoop Flags: Reviewed
• Assignee: Guangxu Cheng
• Reporter: Guangxu Cheng
• Created: 05/Dec/17 12:50
• Updated: 21/Mar/18 22:20
• Resolved: 06/Dec/17 06:30

Description

	// If any of the HFiles for the column families has reached
	// maxsize, we need to roll all the writers
	if (wl != null && wl.written + length >= maxsize) {
	  this.rollRequested = true;
	}

If we always roll all the writers, a large number of small files will be generated in the multi family or multi table scene.
So we should only roll the specified writer which HFile has reached maxsize.