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https://issues.apache.org/jira/browse/HDFS-9311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977469#comment-14977469
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Hadoop QA commented on HDFS-9311:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch | 23m 4s | Pre-patch trunk has 1 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 6 new or modified test files. |
| {color:green}+1{color} | javac | 9m 19s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 13m 31s | There were no new javadoc
warning messages. |
| {color:green}+1{color} | release audit | 0m 29s | The applied patch does
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle | 2m 45s | There were no new checkstyle
issues. |
| {color:red}-1{color} | whitespace | 0m 7s | The patch has 2 line(s) that
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install | 2m 4s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 41s | The patch built with
eclipse:eclipse. |
| {color:green}+1{color} | findbugs | 5m 42s | The patch does not introduce
any new Findbugs (version 3.0.0) warnings. |
| {color:red}-1{color} | common tests | 8m 6s | Tests failed in
hadoop-common. |
| {color:red}-1{color} | hdfs tests | 56m 4s | Tests failed in hadoop-hdfs. |
| | | 121m 57s | |
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|| Reason || Tests ||
| Failed unit tests | hadoop.net.TestDNS |
| | hadoop.hdfs.server.namenode.ha.TestEditLogTailer |
| | hadoop.hdfs.server.namenode.ha.TestRequestHedgingProxyProvider |
| | hadoop.hdfs.util.TestByteArrayManager |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12769101/HDFS-9311.003.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 68ce93c |
| Pre-patch Findbugs warnings |
https://builds.apache.org/job/PreCommit-HDFS-Build/13231/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
|
| whitespace |
https://builds.apache.org/job/PreCommit-HDFS-Build/13231/artifact/patchprocess/whitespace.txt
|
| hadoop-common test log |
https://builds.apache.org/job/PreCommit-HDFS-Build/13231/artifact/patchprocess/testrun_hadoop-common.txt
|
| hadoop-hdfs test log |
https://builds.apache.org/job/PreCommit-HDFS-Build/13231/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HDFS-Build/13231/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf900.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/13231/console |
This message was automatically generated.
> Support optional offload of NameNode HA service health checks to a separate
> RPC server.
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-9311
> URL: https://issues.apache.org/jira/browse/HDFS-9311
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha, namenode
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Attachments: HDFS-9311.001.patch, HDFS-9311.002.patch,
> HDFS-9311.003.patch
>
>
> When a NameNode is overwhelmed with load, it can lead to resource exhaustion
> of the RPC handler pools (both client-facing and service-facing).
> Eventually, this blocks the health check RPC issued from ZKFC, which triggers
> a failover. Depending on fencing configuration, the former active NameNode
> may be killed. In an overloaded situation, the new active NameNode is likely
> to suffer the same fate, because client load patterns don't change after the
> failover. This can degenerate into flapping between the 2 NameNodes without
> real recovery. If a NameNode had been killed by fencing, then it would have
> to transition through safe mode, further delaying time to recovery.
> This issue proposes a separate, optional RPC server at the NameNode for
> isolating the HA health checks. These health checks are lightweight
> operations that do not suffer from contention issues on the namesystem lock
> or other shared resources. Isolating the RPC handlers is sufficient to avoid
> this situation.
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