[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16450873#comment-16450873
]
Hudson commented on HDFS-12028:
---
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #14057 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/14057/])
HDFS-12028. Ozone: CLI: remove noisy slf4j binding output from hdfs oz (wwei:
rev 102dd20b73ef0c9bb502cced12c2e011ae28e3e0)
* (edit) hadoop-hdfs-project/hadoop-hdfs/pom.xml
HDFS-12028. Reapply: Ozone: CLI: remove noisy slf4j binding output from
(aengineer: rev bd23dbfbf740de68b1f7c912f5ec3bf5f6d19a9a)
* (edit) hadoop-hdfs-project/hadoop-hdfs/pom.xml
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
>Priority: Major
> Fix For: HDFS-7240
>
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123561#comment-16123561
]
Anu Engineer commented on HDFS-12028:
-
Thanks to [~elek] I have reapplied the patch and Marton has tested it.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Fix For: HDFS-7240
>
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123540#comment-16123540
]
Anu Engineer commented on HDFS-12028:
-
[~elek] Just told me that I have accidentally broken this patch in ozone tree
while committing HDFS-12115, He will fix it. Sorry for the noise in tests till
it is fixed.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Fix For: HDFS-7240
>
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064251#comment-16064251
]
Weiwei Yang commented on HDFS-12028:
Just committed to the feature branch, thanks for [~vagarychen] to get this
fixed, thanks for [~xyao] and [~anu]'s comments and reviews.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064246#comment-16064246
]
Anu Engineer commented on HDFS-12028:
-
+1 [~vagarychen] Thanks for taking care of this. I independently tested this
now in a cluster and I can confirm it works well. Thank you for taking care of
this. [~cheersyang] Thanks for the review and the commit.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064245#comment-16064245
]
Weiwei Yang commented on HDFS-12028:
Hi [~vagarychen]
You are right. I just did a clean and rebuilt, now the warnings are gone, you
patch works. Thank you. I am going to commit this patch soon. Thank you for
fixing this, it looks really better now :).
Thank you.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063457#comment-16063457
]
Chen Liang commented on HDFS-12028:
---
Thanks [~xyao] for the comments. [~cheersyang] it seems to have resolved in my
environment, could you share a little bit more about how you got this? (e.g.
how and which commands you ran etc). Also, you may need to mvn clean and build
the whole thing again to make the patch take effect.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061787#comment-16061787
]
Xiaoyu Yao commented on HDFS-12028:
---
Read through the discussion on stackoverflow, I think [~vagarychen]'s patch
takes the second approach. The other choice is to ask the jscsi library to add
logback slf4j binding as a runtime dependency.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061774#comment-16061774
]
Weiwei Yang commented on HDFS-12028:
Hi [~vagarychen]
I tried your patch but I still see binding warnings, can you double check if
this patch could resolve the issue?
{code}
SLF4J: Found binding in
[jar:file:/home/wwei/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
{code}
Thank you.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061772#comment-16061772
]
Hadoop QA commented on HDFS-12028:
--
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
20s{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:red}-1{color} | {color:red} test4tests {color} | {color:red} 0m
0s{color} | {color:red} 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} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 15m
10s{color} | {color:green} HDFS-7240 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
54s{color} | {color:green} HDFS-7240 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
3s{color} | {color:green} HDFS-7240 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
53s{color} | {color:green} HDFS-7240 passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
3s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green} 0m
1s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
54s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}116m 55s{color}
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
23s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}140m 53s{color} |
{color:black} {color} |
\\
\\
|| Reason || Tests ||
| Failed junit tests | hadoop.cblock.TestCBlockReadWrite |
| | hadoop.ozone.scm.node.TestNodeManager |
| | hadoop.ozone.container.ozoneimpl.TestOzoneContainerRatis |
| | hadoop.hdfs.server.namenode.ha.TestFailureToReadEdits |
| | hadoop.ozone.container.ozoneimpl.TestRatisManager |
| | hadoop.hdfs.TestDFSStripedOutputStreamWithFailure160 |
| Timed out junit tests | org.apache.hadoop.cblock.TestLocalBlockCache |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:14b5c93 |
| JIRA Issue | HDFS-12028 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12874337/HDFS-12028-HDFS-7240.001.patch
|
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
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| uname | Linux 53aee214831c 3.13.0-116-generic #163-Ubuntu SMP Fri Mar 31
14:13:22 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
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| git revision | HDFS-7240 / 29c942b |
| Default Java | 1.8.0_131 |
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> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>Assignee: Chen Liang
> Attachments: HDFS-12028-HDFS-7240.001.patch
>
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j b
[jira] [Commented] (HDFS-12028) Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
[
https://issues.apache.org/jira/browse/HDFS-12028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16061597#comment-16061597
]
Chen Liang commented on HDFS-12028:
---
Thanks [~xyao] for filing this! I did some initial investigation by looking
into output of "mvn dependency:tree". I think this is caused by jscsi adding
this {{logback-classic-1.0.10.jar}} to its dependency. To resolve this I think
we need to add {{...}} to certain pom files, I haven't
looked into which and where exactly to add though.
> Ozone: CLI: remove noisy slf4j binding output from hdfs oz command.
> ---
>
> Key: HDFS-12028
> URL: https://issues.apache.org/jira/browse/HDFS-12028
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
>Affects Versions: HDFS-7240
>Reporter: Xiaoyu Yao
>
> Currently when you run CLI "hdfs oz ...", there always a noisy slf4j biding
> issue log output. This ticket is opened to removed it.
> {code}
> xyao$ hdfs oz
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/xyao/deploy/ozone/hadoop-3.0.0-alpha4-SNAPSHOT/share/hadoop/hdfs/lib/logback-classic-1.0.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> {code}
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