Liang Xie created HDFS-5461:
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Summary: fallback to non-ssr(local short circuit reads) while oom
detected
Key: HDFS-5461
URL: https://issues.apache.org/jira/browse/HDFS-5461
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 2.2.0, 3.0.0
Reporter: Liang Xie
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.
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