HBASE-17502 Document hadoop pre-2.6.1 and Java 1.8 Kerberos problem in our hadoop support matrix

Author: jerryjch

src/main/asciidoc/_chapters/configuration.adoc

@@ -243,6 +243,15 @@ Use the following legend to interpret this table:
 |Hadoop-2.7.1+ | NT | NT | NT | NT | S | S | S
 |===
 
+.Hadoop Pre-2.6.1 and JDK 1.8 Kerberos
+[TIP]
+====
+When using pre-2.6.1 Hadoop versions and JDK 1.8 in a Kerberos environment, HBase server can fail
+and abort due to Kerberos keytab relogin error. Late version of JDK 1.7 (1.7.0_80) has the problem too.
+Refer to link:https://issues.apache.org/jira/browse/HADOOP-10786[HADOOP-10786] for additional details.
+Consider upgrading to Hadoop 2.6.1+ in this case.
+====
+
 .Hadoop 2.6.x
 [TIP]
 ====