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https://issues.apache.org/jira/browse/HDFS-8929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14714478#comment-14714478
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Hadoop QA commented on HDFS-8929:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  21m 53s | Pre-patch trunk has 4 extant 
Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 1 new or modified test files. |
| {color:green}+1{color} | javac |   7m 52s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m  4s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | site |   3m  1s | Site still builds. |
| {color:green}+1{color} | checkstyle |   2m 36s | There were no new checkstyle 
issues. |
| {color:red}-1{color} | whitespace |   0m  0s | The patch has 1  line(s) that 
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 24s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   4m 29s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | common tests |  22m 59s | Tests passed in 
hadoop-common. |
| {color:red}-1{color} | hdfs tests |   0m 25s | Tests failed in hadoop-hdfs. |
| | |  75m 40s | |
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|| Reason || Tests ||
| Failed build | hadoop-hdfs |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12752499/HDFS-8929-002.patch |
| Optional Tests | site javadoc javac unit findbugs checkstyle |
| git revision | trunk / a4d9acc |
| Pre-patch Findbugs warnings | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12138/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12138/artifact/patchprocess/whitespace.txt
 |
| hadoop-common test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12138/artifact/patchprocess/testrun_hadoop-common.txt
 |
| hadoop-hdfs test log | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12138/artifact/patchprocess/testrun_hadoop-hdfs.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12138/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf906.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/12138/console |


This message was automatically generated.

> 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
>            Assignee: Surendra Singh Lilhore
>         Attachments: HDFS-8929-001.patch, HDFS-8929-002.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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