Datanode drops OS cache behind reads even for short reads
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Key: HDFS-2751
URL: https://issues.apache.org/jira/browse/HDFS-2751
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
HDFS-2465 has some code which attempts to disable the "drop cache behind reads"
functionality when the reads are <256KB (eg HBase random access). But this
check was missing in the {{close()}} function, so it always drops cache behind
reads regardless of the size of the read. This hurts HBase random read
performance when this patch is enabled.
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