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Posted to commits@accumulo.apache.org by kt...@apache.org on 2013/12/03 18:21:22 UTC
git commit: ACCUMULO-1905 added documentation about hsync to
tserver.mutation.queue.max
Updated Branches:
refs/heads/1.5.1-SNAPSHOT 747c7cdbd -> 39260cb90
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/1.5.1-SNAPSHOT
Commit: 39260cb90be7129d91c21a3f85f625f8578ae554
Parents: 747c7cd
Author: Keith Turner <kt...@apache.org>
Authored: Tue Dec 3 12:18:59 2013 -0500
Committer: Keith Turner <kt...@apache.org>
Committed: Tue Dec 3 12:18:59 2013 -0500
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core/src/main/java/org/apache/accumulo/core/conf/Property.java | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/accumulo/blob/39260cb9/core/src/main/java/org/apache/accumulo/core/conf/Property.java
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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 "