[jira] [Created] (HBASE-21706) Inconsistency of fs.defaultFS between active and standby masters

["Lei Chen (JIRA)" <ji...@apache.org>]

Lei Chen created HBASE-21706:
--------------------------------

             Summary: Inconsistency of fs.defaultFS between active and standby masters
                 Key: HBASE-21706
                 URL: https://issues.apache.org/jira/browse/HBASE-21706
             Project: HBase
          Issue Type: Bug
          Components: conf, master
    Affects Versions: 1.1.2
            Reporter: Lei Chen


I'm using HDP-2.3.6.22-1 with HBase HA configured. I noticed that active and standby masters have different `fs.defaultFS` on their /conf pages.
Given `fs.defaultFS` is set to <scheme>:<authority> and `hbase.rootdir` is set to <scheme>:<authority>/<root-dir> in core-site.xml on all the hosts, it looks like standby masters has `fs.defaultFS` programatically set to the same value as `hbase.rootdir`. 

For example, on a 3 heads cluster DEV-CLUSTER, my active master has the following line on the /conf page
{code:java}
<property><name>fs.defaultFS</name><value>hdfs://DEV-CLUSTER</value><source>programatically</source></property>
{code}
but standby masters has 
{code:java}
<property><name>fs.defaultFS</name><value>hdfs://DEV-CLUSTER/hbase-root</value><source>programatically</source></property>{code}

Please correct me if this is not a bug but a feature, but I find this behavior surprising plus I cannot locate any related document.

From a quick looking at the code, the cause seems to be that standby masters got the property set in [HRegionServer.java|https://github.com/hortonworks/hbase-release/blob/HDP-2.6.3.22-tag/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java#L649-L652], and active master got it set in a different way in [MasterFileSystem.java|https://github.com/hortonworks/hbase-release/blob/HDP-2.6.3.22-tag/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java#L132-L137].



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