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From "Akira AJISAKA (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8929) Add a metric to expose the timestamp of the last journal
Date Thu, 20 Aug 2015 08:31:47 GMT
Akira AJISAKA created HDFS-8929:
-----------------------------------

             Summary: Add a metric to expose the timestamp of the last journal
                 Key: HDFS-8929
                 URL: https://issues.apache.org/jira/browse/HDFS-8929
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: journal-node
            Reporter: Akira AJISAKA


If there are three JNs and only one JN is failing to journal, we can detect it by monitoring
the difference of the last written transaction id among JNs from NN WebUI or JN metrics. However,
it's difficult to define the threshold to alert because the increase rate of the number of
transaction depends on how busy the cluster is. Therefore I'd like to propose a metric to
expose the timestamp of the last journal. That way we can easily alert if a JN is failing
to journal for some fixed period.



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