[08/12] storm git commit: updated README.md

[da...@apache.org]

updated README.md


Project: http://git-wip-us.apache.org/repos/asf/storm/repo
Commit: http://git-wip-us.apache.org/repos/asf/storm/commit/4d8c51b4
Tree: http://git-wip-us.apache.org/repos/asf/storm/tree/4d8c51b4
Diff: http://git-wip-us.apache.org/repos/asf/storm/diff/4d8c51b4

Branch: refs/heads/master
Commit: 4d8c51b4503110f03a27b401f096ff2477bbb7cf
Parents: cdabbb3
Author: Arun Mahadevan <ai...@hortonworks.com>
Authored: Mon Aug 10 14:01:24 2015 +0530
Committer: Arun Mahadevan <ai...@hortonworks.com>
Committed: Mon Aug 10 14:01:24 2015 +0530

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 external/storm-hdfs/README.md | 3 +++
 1 file changed, 3 insertions(+)
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http://git-wip-us.apache.org/repos/asf/storm/blob/4d8c51b4/external/storm-hdfs/README.md
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diff --git a/external/storm-hdfs/README.md b/external/storm-hdfs/README.md
index 98fcc55..e1f2b28 100644
--- a/external/storm-hdfs/README.md
+++ b/external/storm-hdfs/README.md
@@ -323,6 +323,9 @@ duplicates from the current data file by copying the data up to the last transac
 operation involves a lot of data copy, ensure that the data files are rotated at reasonable sizes with `FileSizeRotationPolicy` 
 and at reasonable intervals with `TimedRotationPolicy` so that the recovery can complete within topology.message.timeout.secs.
 
+Also note with `TimedRotationPolicy` the files are never rotated in the middle of a batch even if the timer ticks, 
+but only when a batch completes so that complete batches can be efficiently recovered in case of failures.
+
 ##Working with Secure HDFS
 If your topology is going to interact with secure HDFS, your bolts/states needs to be authenticated by NameNode. We 
 currently have 2 options to support this: