[HBASE-12263] RegionServer listens on localhost in distributed cluster when DNS is unavailable

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 0.99.2
• Hadoop Flags: Reviewed
• Assignee: Shaohui Liu
• Reporter: Shaohui Liu
• Created: 15/Oct/14 05:42
• Updated: 06/Apr/18 17:55
• Resolved: 17/Oct/14 20:53

Description

When DNS is unavailable, the new started regionservers will listen on localhost(127.0.0.1) in a distributed cluster, which results that the hmaster will fail to assign regions to those regionservers.

2014-10-15,04:26:42,273 WARN org.apache.hadoop.net.DNS: Unable to determine local hostname -falling back to "localhost"
java.net.UnknownHostException: xx-hadoop-srv-st01.bj: xx-hadoop-srv-st01.bj
at java.net.InetAddress.getLocalHost(InetAddress.java:1360)
at org.apache.hadoop.net.DNS.resolveLocalHostname(DNS.java:260)
at org.apache.hadoop.net.DNS.<clinit>(DNS.java:58)
at org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:472)

$ netstat -nap | grep 13748
tcp 0 0 127.0.0.1:12610 0.0.0.0:* LISTEN 13748/java
tcp 0 0 0.0.0.0:12611 0.0.0.0:* LISTEN 13748/java

In this situation, I think we shoud throw an exception and make the startup of regionservers failed.