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https://issues.apache.org/jira/browse/HDFS-5076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-5076:
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Attachment: HDFS-5076.005.patch
After some offline discussion with Suresh, we think a MXBean method
getJournalStatus(String jid) may not be a good idea: a bad jid will also cause
the creation a corresponding Journal object in JN, and this may allow malicious
users to attack JN.
Because Journal objects are created lazily, it is possible that a journal has
been formatted but is not included in the journalsById list because of JN's
restarting. In the current patch we just simply assume that if a directory has
been created in the journal dir, the corresponding journal should have been
formatted. We can also call analyzeStorage method to make sure if necessary.
> Add MXBean methods to query NN's transaction information and JournalNode's
> journal status
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-5076
> URL: https://issues.apache.org/jira/browse/HDFS-5076
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 3.0.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Priority: Minor
> Attachments: HDFS-5076.001.patch, HDFS-5076.002.patch,
> HDFS-5076.003.patch, HDFS-5076.004.patch, HDFS-5076.005.patch
>
>
> Currently NameNode already provides RPC calls to get its last applied
> transaction ID and most recent checkpoint's transaction ID. It can be helpful
> to provide support to enable querying these information through JMX, so that
> administrators and applications like Ambari can easily decide if a forced
> checkpoint by calling saveNamespace is necessary. Similarly we can add MxBean
> interface for JournalNodes to query the status of journals (e.g., whether
> journals are formatted or not).
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