From d57dba99428cbe3f3dfcec834d79f709e7529ef9 Mon Sep 17 00:00:00 2001
From: Junping Du <junping_du@apache.org>
Date: Wed, 1 Nov 2017 14:48:16 -0700
Subject: [PATCH] YARN-7400. Incorrect log preview displayed in jobhistory
 server ui. Contributed by Xuan Gong.

---
 .../filecontroller/ifile/IndexedFileAggregatedLogsBlock.java  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/logaggregation/filecontroller/ifile/IndexedFileAggregatedLogsBlock.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/logaggregation/filecontroller/ifile/IndexedFileAggregatedLogsBlock.java
index 5439b534b05..db2915ab256 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/logaggregation/filecontroller/ifile/IndexedFileAggregatedLogsBlock.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/logaggregation/filecontroller/ifile/IndexedFileAggregatedLogsBlock.java
@@ -221,8 +221,8 @@ public class IndexedFileAggregatedLogsBlock extends LogAggregationHtmlBlock {
                       __(" for the full log.").__();
             }
             long totalSkipped = 0;
-            while (totalSkipped < start) {
-              long ret = in.skip(start - totalSkipped);
+            while (totalSkipped < startIndex) {
+              long ret = in.skip(startIndex - totalSkipped);
               if (ret == 0) {
                 //Read one byte
                 int nextByte = in.read();