[HBASE-17058] Lower epsilon used for jitter verification from HBASE-15324

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0, 1.4.0, 1.1.7, 1.2.4, 2.0.0
• Fix Version/s: 1.3.0, 1.2.5, 1.1.8, 2.0.0
• Component/s: Compaction
• Assignee: Esteban Gutierrez
• Reporter: Esteban Gutierrez
• Created: 10/Nov/16 02:45
• Updated: 09/Nov/17 02:45
• Resolved: 17/Nov/16 20:33

Description

The current epsilon used is 1E-6 and its too big it might overflow the desiredMaxFileSize. A trivial fix is to lower the epsilon to 2^-52 or even 2^-53. An option to consider too is just to shift the jitter to always decrement hbase.hregion.max.filesize (MAX_FILESIZE) instead of increase the size of the region and having to deal with the round off.

Issue Links

• relates to: HBASE-15324 Jitter may cause desiredMaxFileSize overflow in ConstantSizeRegionSplitPolicy and trigger unexpected split