Author: umamahesh
Date: Mon Mar 19 19:54:13 2012
New Revision: 1302624
URL: http://svn.apache.org/viewvc?rev=1302624&view=rev
Log:
HDFS-3091. Update the usage limitations of ReplaceDatanodeOnFailure policy in
the config description for the smaller clusters. Contributed by Nicholas.
Modified:
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
Modified: hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
URL:
http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt?rev=1302624&r1=1302623&r2=1302624&view=diff
==============================================================================
--- hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt (original)
+++ hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt Mon Mar 19
19:54:13 2012
@@ -52,6 +52,9 @@ Trunk (unreleased changes)
HDFS-3111. Missing license headers in trunk. (umamahesh)
+ HDFS-3091. Update the usage limitations of ReplaceDatanodeOnFailure policy
in
+ the config description for the smaller clusters. (szetszwo via umamahesh)
+
OPTIMIZATIONS
BUG FIXES
Modified:
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
URL:
http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml?rev=1302624&r1=1302623&r2=1302624&view=diff
==============================================================================
---
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
(original)
+++
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
Mon Mar 19 19:54:13 2012
@@ -371,6 +371,12 @@
This is a site-wide property to enable/disable the feature.
+ When the cluster size is extremely small, e.g. 3 nodes or less, cluster
+ administrators may want to set the policy to NEVER in the default
+ configuration file or disable this feature. Otherwise, users may
+ experience an unusually high rate of pipeline failures since it is
+ impossible to find new datanodes for replacement.
+
See also dfs.client.block.write.replace-datanode-on-failure.policy
</description>
</property>
