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https://issues.apache.org/jira/browse/HDFS-8929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14736312#comment-14736312
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Hudson commented on HDFS-8929:
------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk #2286 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/2286/])
HDFS-8929. Add a metric to expose the timestamp of the last journal
(Contributed by surendra singh lilhore) (vinayakumarb: rev
94cf7ab9d28a885181afeb2c181dfe857d158254)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/Journal.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/server/TestJournalNode.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/JournalMetrics.java
* hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md
> 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: Improvement
> Components: journal-node
> Reporter: Akira AJISAKA
> Assignee: Surendra Singh Lilhore
> Fix For: 2.8.0
>
> Attachments: HDFS-8929-001.patch, HDFS-8929-002.patch,
> HDFS-8929-003.patch, HDFS-8929-004.patch, HDFS-8929-005.patch
>
>
> 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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