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From els...@apache.org
Subject [2/2] git commit: Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT
Date Tue, 03 Dec 2013 16:47:30 GMT
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT


Project: http://git-wip-us.apache.org/repos/asf/accumulo/repo
Commit: http://git-wip-us.apache.org/repos/asf/accumulo/commit/747c7cdb
Tree: http://git-wip-us.apache.org/repos/asf/accumulo/tree/747c7cdb
Diff: http://git-wip-us.apache.org/repos/asf/accumulo/diff/747c7cdb

Branch: refs/heads/1.5.1-SNAPSHOT
Commit: 747c7cdbd38f33d5c611dded1d04b3adbe848cd8
Parents: cd96f85 47403ba
Author: Josh Elser <elserj@apache.org>
Authored: Tue Dec 3 11:46:31 2013 -0500
Committer: Josh Elser <elserj@apache.org>
Committed: Tue Dec 3 11:46:31 2013 -0500

----------------------------------------------------------------------
 README | 5 +++++
 1 file changed, 5 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/accumulo/blob/747c7cdb/README
----------------------------------------------------------------------
diff --cc README
index ab6f3fc,bc469fc..a100077
--- a/README
+++ b/README
@@@ -76,28 -69,15 +76,33 @@@ the machines in the cluster and that ha
  found in the same location on every machine in the cluster.  You will need to
  have password-less ssh set up as described in the hadoop documentation. 
  
 -You will need to have hadoop installed and configured on your system.
 -Accumulo 1.4.5-SNAPSHOT has been tested with hadoop version 0.20.2 and
 -0.20.203.0.
 +You will need to have hadoop installed and configured on your system.  Accumulo
 +1.5.0 has been tested with hadoop version 1.0.4.  To avoid data loss,
 +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
 +
 +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.
  
+ Additionally, it is strongly recommended that you enable 'dfs.datanode.synconclose'
+ (only available in Apache Hadoop >=1.1.1 or >=0.23) 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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