Harsh J created HDFS-4508:
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Summary: Two minor improvements to the QJM Deployment docs
Key: HDFS-4508
URL: https://issues.apache.org/jira/browse/HDFS-4508
Project: Hadoop HDFS
Issue Type: Bug
Components: documentation
Affects Versions: 2.0.3-alpha
Reporter: Harsh J
Priority: Minor
Suggested by ML user Azurry, the docs at
http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/HDFSHighAvailabilityWithQJM.html#Deployment_details
can be improved for two specific lines:
{quote}
* If you have already formatted the NameNode, or are converting a
non-HA-enabled cluster to be HA-enabled, you should now copy over the contents
of your NameNode metadata directories to the other, unformatted NameNode by
running the command "hdfs namenode -bootstrapStandby" on the unformatted
NameNode. Running this command will also ensure that the JournalNodes (as
configured by dfs.namenode.shared.edits.dir) contain sufficient edits
transactions to be able to start both NameNodes.
* If you are converting a non-HA NameNode to be HA, you should run the command
"hdfs -initializeSharedEdits", which will initialize the JournalNodes with the
edits data from the local NameNode edits directories.
{quote}
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