Hostname returned via reverse dns lookup contains trailing period if configured
interface is not "default"
----------------------------------------------------------------------------------------------------------
Key: HBASE-4109
URL: https://issues.apache.org/jira/browse/HBASE-4109
Project: HBase
Issue Type: Bug
Components: master, regionserver
Affects Versions: 0.90.3
Reporter: Shrijeet Paliwal
Fix For: 0.90.4
If you are using an interface anything other than 'default' (literally that
keyword) DNS.java 's getDefaultHost will return a string which will
have a trailing period at the end. It seems javadoc of reverseDns in DNS.java
(see below) is conflicting with what that function is actually doing.
It is returning a PTR record while claims it returns a hostname. The PTR record
always has period at the end , RFC: http://irbs.net/bog-4.9.5/bog47.html
We make call to DNS.getDefaultHost at more than one places and treat that as
actual hostname.
Quoting HRegionServer for example
{code}
String machineName = DNS.getDefaultHost(conf.get(
"hbase.regionserver.dns.interface", "default"), conf.get(
"hbase.regionserver.dns.nameserver", "default"));
{code}
This causes inconsistencies. An example of such inconsistency was observed
while debugging the issue "Regions not getting reassigned if RS is brought
down". More here
http://search-hadoop.com/m/CANUA1qRCkQ1
We may want to sanitize the string returned from DNS class. Or better we can
take a path of overhauling the way we do DNS name matching all over.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
