[HBASE-12897] Minimum memstore size is a percentage

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.98.10, 1.1.0, 2.0.0
• Fix Version/s: 1.0.0, 1.1.0, 0.98.11
• Hadoop Flags: Reviewed
• Release Note: This change lowers the minimum acceptable configured memstore heap percentage from 5% (0.05f) (10% (0.1f) in 0.98) to 0% (0.0f), and in branch 0.98 lowers the maximum acceptable percentage from 90% (0.9f) to 80% (0.8f).
• Assignee: churro morales
• Reporter: churro morales
• Created: 21/Jan/15 21:08
• Updated: 06/Apr/18 17:54
• Resolved: 07/Feb/15 00:20

Description

We have a cluster which is optimized for random reads. Thus we have a large block cache and a small memstore. Currently our heap is 20GB and we wanted to configure the memstore to take 4% or 800MB. Right now the minimum memstore size is 5%. What do you guys think about reducing the minimum size to 1%? Suppose we log a warning if the memstore is below 5% but allow it?

What do you folks think?

Issue Links

• is duplicated by: HBASE-9472 If the memstore size is under .1 or greater than .9 the memstore size defaults to the default memstore size