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https://issues.apache.org/jira/browse/HADOOP-12475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14958450#comment-14958450
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Hadoop QA commented on HADOOP-12475:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch | 19m 20s | Pre-patch trunk compilation is
healthy. |
| {color:green}+1{color} | @author | 0m 0s | The patch does not contain any
@author tags. |
| {color:red}-1{color} | tests included | 0m 0s | The patch doesn't appear
to include any new or modified tests. Please justify why no new tests are
needed for this patch. Also please list what manual steps were performed to
verify this patch. |
| {color:green}+1{color} | javac | 8m 33s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 11m 26s | There were no new javadoc
warning messages. |
| {color:red}-1{color} | release audit | 0m 21s | The applied patch generated
1 release audit warnings. |
| {color:green}+1{color} | checkstyle | 1m 10s | There were no new checkstyle
issues. |
| {color:green}+1{color} | whitespace | 0m 0s | The patch has no lines that
end in whitespace. |
| {color:green}+1{color} | install | 1m 42s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 38s | The patch built with
eclipse:eclipse. |
| {color:green}+1{color} | findbugs | 2m 1s | The patch does not introduce
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | common tests | 6m 52s | Tests passed in
hadoop-common. |
| | | 52m 8s | |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12766732/HADOOP-12475.03.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / c80b3a8 |
| Release Audit |
https://builds.apache.org/job/PreCommit-HADOOP-Build/7818/artifact/patchprocess/patchReleaseAuditProblems.txt
|
| hadoop-common test log |
https://builds.apache.org/job/PreCommit-HADOOP-Build/7818/artifact/patchprocess/testrun_hadoop-common.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HADOOP-Build/7818/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf902.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-HADOOP-Build/7818/console |
This message was automatically generated.
> Replace guava Cache with ConcurrentHashMap for caching Connection in ipc
> Client
> -------------------------------------------------------------------------------
>
> Key: HADOOP-12475
> URL: https://issues.apache.org/jira/browse/HADOOP-12475
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: conf, io, ipc
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HADOOP-12475.01.patch, HADOOP-12475.02.patch,
> HADOOP-12475.03.patch
>
>
> quote [~daryn] from HADOOP-11772:
> {quote}
> CacheBuilder is obscenely expensive for concurrent map, and it requires
> generating unnecessary garbage even just to look up a key. Replace it with
> ConcurrentHashMap.
> I identified this issue that impaired my own perf testing under load. The
> slowdown isn't just the sync. It's the expensive of Connection's ctor
> stalling other connections. The expensive of ConnectionId#equals causes
> delays. Synch'ing on connections causes unfair contention unlike a sync'ed
> method. Concurrency simply hides this.
> {quote}
> BTW, guava Cache is heavyweight. Per local test, ConcurrentHashMap has better
> overal performance.
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