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)
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/3fe79e1d Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/3fe79e1d Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/3fe79e1d Branch: refs/heads/HDFS-7240 Commit: 3fe79e1db84391cb17dbed6b579fe9c803b3d1c2 Parents: 7dc3c120 Author: Colin Patrick Mccabe <cmcc...@cloudera.com> Authored: Mon May 4 12:50:29 2015 -0700 Committer: Colin Patrick Mccabe <cmcc...@cloudera.com> Committed: Mon May 4 12:50:29 2015 -0700 ---------------------------------------------------------------------- hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt | 4 ++++ .../hadoop-hdfs/src/main/resources/hdfs-default.xml | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/hadoop/blob/3fe79e1d/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt ---------------------------------------------------------------------- diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt index a365b86..21d73ba 100644 --- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt +++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt @@ -500,6 +500,10 @@ Release 2.8.0 - UNRELEASED HDFS-8249. Separate HdfsConstants into the client and the server side 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 HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than http://git-wip-us.apache.org/repos/asf/hadoop/blob/3fe79e1d/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml ---------------------------------------------------------------------- diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml index f03c0fb..e3e4323 100644 --- a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml +++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml @@ -2063,7 +2063,7 @@ <value>256</value> <description> 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, but potentially provide better performance on workloads involving lots of seeks.