[ https://issues.apache.org/jira/browse/HBASE-18226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Duo Xu updated HBASE-18226: --------------------------- Attachment: HBASE-18226.006.patch > Disable reverse DNS lookup at HMaster and use default hostname provided by > RegionServer > --------------------------------------------------------------------------------------- > > Key: HBASE-18226 > URL: https://issues.apache.org/jira/browse/HBASE-18226 > Project: HBase > Issue Type: Bug > Reporter: Duo Xu > Assignee: Duo Xu > Attachments: HBASE-18226.001.patch, HBASE-18226.002.patch, > HBASE-18226.003.patch, HBASE-18226.004.patch, HBASE-18226.005.patch, > HBASE-18226.006.patch > > > Description updated: > In some unusual network environment, forward DNS lookup is supported while > reverse DNS lookup may not work properly. > This JIRA is to address that HMaster uses the hostname passed from RS instead > of doing reverse DNS lookup to tells RS which hostname to use during > reportForDuty() . This has already been implemented by HBASE-12954 by adding > "useThisHostnameInstead" field in RegionServerStatusProtos. > Currently "useThisHostnameInstead" is optional and RS by default only passes > port, server start code and server current time info to HMaster during RS > reportForDuty(). In order to use this field, users currently need to specify > "hbase.regionserver.hostname" on every regionserver node's hbase-site.xml. > This causes some trouble in > 1. some deployments managed by some management tools like Ambari, which > maintains the same copy of hbase-site.xml across all the nodes. > 2. HBASE-12954 is targeting multihomed hosts, which users want to manually > set the hostname value for each node. In the other cases (not multihomed), I > just want RS to use the hostname return by the node and set it in > useThisHostnameInstead and pass to HMaster during reportForDuty(). > I would like to introduce a setting that if the setting is set to true, > "useThisHostnameInstead" will be set to the hostname RS gets from the node. > Then HMaster will skip reverse DNS lookup because it sees > "useThisHostnameInstead" field is set in the request. > "hbase.regionserver.hostname.reported.to.master", is it a good name? > -------------------- > Regarding the hostname returned by the RS node, I read the source code again > (including hadoop-common dns.java). By default RS gets hostname by calling > InetAddress.getLocalHost().getCanonicalHostName(). If users specify > "hbase.regionserver.dns.interface" or "hbase.regionserver.dns.nameserver" or > some underlying system configuration changes (eg. modifying > /etc/nsswitch.conf), it may first read from DNS or other sources instead of > first checking /etc/hosts file. -- This message was sent by Atlassian JIRA (v6.4.14#64029)