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From ktur...@apache.org
Subject [1/2] git commit: ACCUMULO-1905 added documentation about hsync to tserver.mutation.queue.max
Date Tue, 03 Dec 2013 17:21:36 GMT
Updated Branches:
  refs/heads/1.6.0-SNAPSHOT b5227cf31 -> eab163dcf


ACCUMULO-1905 added documentation about hsync to tserver.mutation.queue.max


Project: http://git-wip-us.apache.org/repos/asf/accumulo/repo
Commit: http://git-wip-us.apache.org/repos/asf/accumulo/commit/39260cb9
Tree: http://git-wip-us.apache.org/repos/asf/accumulo/tree/39260cb9
Diff: http://git-wip-us.apache.org/repos/asf/accumulo/diff/39260cb9

Branch: refs/heads/1.6.0-SNAPSHOT
Commit: 39260cb90be7129d91c21a3f85f625f8578ae554
Parents: 747c7cd
Author: Keith Turner <kturner@apache.org>
Authored: Tue Dec 3 12:18:59 2013 -0500
Committer: Keith Turner <kturner@apache.org>
Committed: Tue Dec 3 12:18:59 2013 -0500

----------------------------------------------------------------------
 core/src/main/java/org/apache/accumulo/core/conf/Property.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/accumulo/blob/39260cb9/core/src/main/java/org/apache/accumulo/core/conf/Property.java
----------------------------------------------------------------------
diff --git a/core/src/main/java/org/apache/accumulo/core/conf/Property.java b/core/src/main/java/org/apache/accumulo/core/conf/Property.java
index f4c1778..424b737 100644
--- a/core/src/main/java/org/apache/accumulo/core/conf/Property.java
+++ b/core/src/main/java/org/apache/accumulo/core/conf/Property.java
@@ -122,7 +122,10 @@ public enum Property {
   TSERV_PORTSEARCH("tserver.port.search", "false", PropertyType.BOOLEAN, "if the ports above
are in use, search higher ports until one is available"),
   TSERV_CLIENTPORT("tserver.port.client", "9997", PropertyType.PORT, "The port used for handling
client connections on the tablet servers"),
   TSERV_MUTATION_QUEUE_MAX("tserver.mutation.queue.max", "256K", PropertyType.MEMORY,
-      "The amount of memory to use to store write-ahead-log mutations-per-session before
flushing them."),
+      "The amount of memory to use to store write-ahead-log mutations-per-session before
flushing them. Since the buffer is per write session, consider the"
+          + " max number of concurrent writer when configuring.  When using Hadoop 2, Accumulo
will call hsync() on the WAL .  For a small number of "
+          + "concurrent writers, increasing this buffer size decreases the frequncy of hsync
calls.  For a large number of concurrent writers a small buffers "
+          + "size is ok because of group commit."),
   TSERV_TABLET_SPLIT_FINDMIDPOINT_MAXOPEN("tserver.tablet.split.midpoint.files.max", "30",
PropertyType.COUNT,
       "To find a tablets split points, all index files are opened. This setting determines
how many index "
           + "files can be opened at once. When there are more index files than this setting
multiple passes "


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