Amit Anand created HDFS-10665:
---------------------------------
Summary: Provide a way to add a new Journalnode to an existing
quorum
Key: HDFS-10665
URL: https://issues.apache.org/jira/browse/HDFS-10665
Project: Hadoop HDFS
Issue Type: New Feature
Components: ha, hdfs, journal-node
Reporter: Amit Anand
In current implementation of {{HDFS}} {{HA}} using {{QJOURNAL}} there is no way
to add a new {{Journalnode(JN)}} to an existing {{JN}} quorum or reinstall a
failed {{JN}} machine.
The current process to populate {{JN}} directories is:
* Start {{JN}} daemons on multiple machines (usually an odd number 3 or 5)
* Shutdown {{Namenode}}
* Issue {{hdfs namenode -initializeSharedEdits}} - This will populate {{JN}}
After {{JN}} are populated; if a machine, after hardware failure, is
reinstalled or a new set of machines are added to expand the {{JN}} quorum the
new {{JN}} machines will not be populated by {{NameNode}} without following the
current process that is described above.
The current process causes downtime on a 24x7 operation cluster if {{JN}} needs
any maintenance.
Although, one can follow steps given below to work around the issue described
above:
1. Install a new {{JN}} or reinstall an existing {{JN}} machine.
2. Created the required {{JN}} directory structure
3. Copy {{VERSION}} file from an existing {{JN}} to {{JN's}} {{current}}
directory
4. Manually create {{paxos}} directory under {{JN's}} {{current}} directory
5. Start the {{JN}} daemon.
6. Add new set of {{JNs}} to {{hdfs-site.xml}} and restart {{NN}}
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