[HBASE-6372] Add scanner batching to Export job

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.94.2, 0.95.2
• Fix Version/s: 0.95.0
• Component/s: mapreduce
• Hadoop Flags: Reviewed
• Release Note: Adds a command-line flag hbase.export.scanner.batch to the export tool.
• Assignee: Shane Huang
• Reporter: Lars George
• Created: 11/Jul/12 14:41
• Updated: 05/Aug/14 20:12
• Resolved: 25/Aug/12 04:53

Description

When a single row is too large for the RS heap then an OOME can take out the entire RS. Setting scanner batching in custom scans helps avoiding this scenario, but for the supplied Export job this is not set.

Similar to HBASE-3421 we can set the batching to a low number - or if needed make it a command line option.