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HDFS-7397. Add more detail to the documentation for the conf key "dfs.client.read.shortcircuit.streams.cache.size" (Brahma Reddy Battula via Colin P. McCabe) 

(cherry picked from commit 3fe79e1db8)
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Colin Patrick Mccabe 2015-05-04 12:50:29 -07:00
parent 87c2d915f1
commit 8efcf5bdbd
2 changed files with 5 additions and 1 deletions
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4
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -173,6 +173,10 @@ Release 2.8.0 - UNRELEASED
HDFS-8249. Separate HdfsConstants into the client and the server side HDFS-8249. Separate HdfsConstants into the client and the server side
class. (wheat9) class. (wheat9)
HDFS-7397. Add more detail to the documentation for the conf key
"dfs.client.read.shortcircuit.streams.cache.size" (Brahma Reddy Battula via
Colin P. McCabe)
OPTIMIZATIONS OPTIMIZATIONS
HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

2
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -2054,7 +2054,7 @@
<value>256</value> <value>256</value>
<description> <description>
The DFSClient maintains a cache of recently opened file descriptors. The DFSClient maintains a cache of recently opened file descriptors.
This parameter controls the size of that cache. This parameter controls the maximum number of file descriptors in the cache.
Setting this higher will use more file descriptors, Setting this higher will use more file descriptors,
but potentially provide better performance on workloads but potentially provide better performance on workloads
involving lots of seeks. involving lots of seeks.