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HDFS-2751. Datanode may incorrectly drop OS cache behind reads even for short reads. Contributed by Todd Lipcon.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1233796 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2012-01-20 07:32:06 +00:00
parent 520a39ac2d
commit f7d20b2198
2 changed files with 4 additions and 1 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -340,6 +340,9 @@ Release 0.23.1 - UNRELEASED
HDFS-2810. Leases not getting renewed properly by clients (todd) HDFS-2810. Leases not getting renewed properly by clients (todd)
HDFS-2751. Datanode may incorrectly drop OS cache behind reads
even for short reads. (todd)
Release 0.23.0 - 2011-11-01 Release 0.23.0 - 2011-11-01
INCOMPATIBLE CHANGES INCOMPATIBLE CHANGES

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockSender.java
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@ -315,7 +315,7 @@ class BlockSender implements java.io.Closeable {
* close opened files. * close opened files.
*/ */
public void close() throws IOException { public void close() throws IOException {
if (blockInFd != null && shouldDropCacheBehindRead) { if (blockInFd != null && shouldDropCacheBehindRead && isLongRead()) {
// drop the last few MB of the file from cache // drop the last few MB of the file from cache
try { try {
NativeIO.posixFadviseIfPossible( NativeIO.posixFadviseIfPossible(