From 8bd2b4d7bddea70f89efc02b248806898887e91f Mon Sep 17 00:00:00 2001
From: Jim Kellerman <jimk@apache.org>
Date: Wed, 21 Jan 2009 18:18:02 +0000
Subject: [PATCH] HBASE-1138 Set default HLog block size.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@736359 13f79535-47bb-0310-9956-ffa450edef68
---
 conf/hbase-default.xml                                  | 8 ++++++++
 src/java/org/apache/hadoop/hbase/regionserver/HLog.java | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/conf/hbase-default.xml b/conf/hbase-default.xml
index 9a458dcf18e..d392a912123 100644
--- a/conf/hbase-default.xml
+++ b/conf/hbase-default.xml
@@ -180,6 +180,14 @@
     milliseconds.
     </description>
   </property>
+  <property>
+    <name>hbase.regionserver.hlog.blocksize</name>
+    <value>67108864</value>
+    <description>Block size for HLog files. To minimize potential data loss,
+    the size should be (avg key length) * (avg value length) * flushlogentries.
+    Default 64MB.
+    </description>
+  </property>
   <property>
     <name>hbase.regionserver.thread.splitcompactcheckfrequency</name>
     <value>20000</value>
diff --git a/src/java/org/apache/hadoop/hbase/regionserver/HLog.java b/src/java/org/apache/hadoop/hbase/regionserver/HLog.java
index 545434bcbf6..2636380101b 100644
--- a/src/java/org/apache/hadoop/hbase/regionserver/HLog.java
+++ b/src/java/org/apache/hadoop/hbase/regionserver/HLog.java
@@ -174,7 +174,7 @@ public class HLog implements HConstants, Syncable {
     this.flushlogentries =
       conf.getInt("hbase.regionserver.flushlogentries", 100);
     this.blocksize =
-      conf.getLong("hbase.regionserver.hlog.blocksize", 1024L * 1024L);
+      conf.getLong("hbase.regionserver.hlog.blocksize", 1024L * 1024L * 64L);
     this.optionalFlushInterval =
       conf.getLong("hbase.regionserver.optionallogflushinterval", 10 * 1000);
     this.threadWakeFrequency = conf.getLong(THREAD_WAKE_FREQUENCY, 10 * 1000);