From e8f44a29ddf940a3bd254b10336c8e2c1f318fc7 Mon Sep 17 00:00:00 2001
From: Timothy Bish <tabish121@gmail.com>
Date: Wed, 2 Mar 2016 17:18:30 -0500
Subject: [PATCH] https://issues.apache.org/jira/browse/AMQ-5578

Revert to previous behavior of explicit init.
---
 .../apache/activemq/store/kahadb/disk/journal/Journal.java | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/disk/journal/Journal.java b/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/disk/journal/Journal.java
index ba0b9f5124..2604e39096 100644
--- a/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/disk/journal/Journal.java
+++ b/activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/disk/journal/Journal.java
@@ -275,7 +275,12 @@ public class Journal {
 
     private void doPreallocationZeros(RecoverableRandomAccessFile file) {
         ByteBuffer buffer = ByteBuffer.allocate(maxFileLength);
-        buffer.limit(maxFileLength);
+        // intentional double initialization due to interaction with the OS level
+        // file allocation mechanics.
+        for (int i = 0; i < maxFileLength; i++) {
+            buffer.put((byte) 0x00);
+        }
+        buffer.flip();
 
         try {
             FileChannel channel = file.getChannel();