[HDFS-5461] fallback to non-ssr(local short circuit reads) while oom detected

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.2.0, 3.0.0-alpha1
• Labels: BB2015-05-TBR
• Assignee: Liang Xie
• Reporter: Liang Xie
• Created: 05/Nov/13 06:58
• Updated: 12/May/16 18:12

Description

Currently, the DirectBufferPool used by ssr feature seems doesn't have a upper-bound limit except DirectMemory VM option. So there's a risk to encounter direct memory oom. see HBASE-8143 for example.
IMHO, maybe we could improve it a bit:
1) detect OOM or reach a setting up-limit from caller, then fallback to non-ssr
2) add a new metric about current raw consumed direct memory size.