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From els...@apache.org
Subject [2/3] git commit: Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
Date Mon, 02 Dec 2013 17:47:49 GMT
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT


Project: http://git-wip-us.apache.org/repos/asf/accumulo/repo
Commit: http://git-wip-us.apache.org/repos/asf/accumulo/commit/29223f79
Tree: http://git-wip-us.apache.org/repos/asf/accumulo/tree/29223f79
Diff: http://git-wip-us.apache.org/repos/asf/accumulo/diff/29223f79

Branch: refs/heads/master
Commit: 29223f796dbac1d74818bd71db81906e8040c077
Parents: 9b6b9cf 0fd190b
Author: Josh Elser <elserj@apache.org>
Authored: Mon Dec 2 12:45:48 2013 -0500
Committer: Josh Elser <elserj@apache.org>
Committed: Mon Dec 2 12:45:48 2013 -0500

----------------------------------------------------------------------
 README | 4 ++++
 1 file changed, 4 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/accumulo/blob/29223f79/README
----------------------------------------------------------------------
diff --cc README
index b18ab6c,ab6f3fc..70bc18e
--- a/README
+++ b/README
@@@ -129,16 -81,23 +129,20 @@@ You will need to have hadoop installed 
  you must enable HDFS durable sync.  How you enable this depends on your version
  of Hadoop. Please consult the table below for information regarding your version.
  If you need to set the coniguration, please be sure to restart HDFS. See 
 -ACCUMULO-623 for more information.
 -
 -HADOOP RELEASE          VERSION           SYNC NAME             DEFAULT
 -Apache Hadoop           0.20.205          dfs.support.append    false
 -Apache Hadoop            0.23.x           dfs.support.append    true
 -Apache Hadoop             1.0.x           dfs.support.append    false
 -Apache Hadoop             1.1.x           dfs.durable.sync      true
 -Apache Hadoop          2.0.0-2.0.4        dfs.support.append    true
 -Cloudera CDH             3u0-3u3             ????               true
 -Cloudera CDH               3u4            dfs.support.append    true
 -Hortonworks HDP           `1.0            dfs.support.append    false
 -Hortonworks HDP           `1.1            dfs.support.append    false
 +ACCUMULO-623 and ACCUMULO-1637 for more information.
 +
 +The following releases of Apache Hadoop require special configuration to ensure 
 +that data is not inadvertently lost; however, in all releases of Apache Hadoop, 
 +`dfs.durable.sync` and `dfs.support.append` should *not* be configured as `false`.
 +
 +VERSION        NAME=VALUE
 +0.20.205.0  -  dfs.support.append=true
 +1.0.x       -  dfs.support.append=true
  
+ Additionally, it is strongly recommended that you enable 'dfs.datanode.synconclose'
+ in your hdfs-site.xml configuration file to ensure that, in the face of unexpected 
+ power loss to a datanode, files are wholly synced to disk.
+ 
  The example accumulo configuration files are placed in directories based on the 
  memory footprint for the accumulo processes.  If you are using native libraries
  for you tablet server in-memory map, then you can use the files in "native-standalone".


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