[jira] [Commented] (HDFS-12332) Logging improvement suggestion for SampleStat function MinMax.add
[
https://issues.apache.org/jira/browse/HDFS-12332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17802468#comment-17802468
]
Shilun Fan commented on HDFS-12332:
---
Bulk update: moved all 3.4.0 non-blocker issues, please move back if it is a
blocker. Retarget 3.5.0
> Logging improvement suggestion for SampleStat function MinMax.add
> -
>
> Key: HDFS-12332
> URL: https://issues.apache.org/jira/browse/HDFS-12332
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: metrics
>Affects Versions: 3.0.0-alpha4
>Reporter: Xu Zhao
>Priority: Minor
> Attachments: hdfs-12332.patch
>
>
> In order to debug performance anomlies, it is better to see when the max and
> min value get updated in metrics.
> For example, in our workload we would like to see the longest latency of a
> write block request on DataNode.
> The following metric updating code could possibly update the min/max value in
> SampleStat class:
> {code:java}
> datanode.getMetrics().addWriteBlockOp(elapsed());
> datanode.getMetrics().incrWritesFromClient(peer.isLocal(), size);
> {code}
> Here I am attaching an attempt to patch it.
> The patch just adds additional DEBUG level logging in the MinMax class and
> prints the new value when it gets updated.
> Please let me know what you think. For example, if this patch would introduce
> too much noises, what is the best way to trace the read/writeBlock that has
> the minimum/maximum latency?
> Any comments are appreciated!
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[jira] [Commented] (HDFS-12332) Logging improvement suggestion for SampleStat function MinMax.add
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https://issues.apache.org/jira/browse/HDFS-12332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17081542#comment-17081542
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Hadoop QA commented on HDFS-12332:
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[jira] [Commented] (HDFS-12332) Logging improvement suggestion for SampleStat function MinMax.add
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https://issues.apache.org/jira/browse/HDFS-12332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16697232#comment-16697232
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Hadoop QA commented on HDFS-12332:
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[jira] [Commented] (HDFS-12332) Logging improvement suggestion for SampleStat function MinMax.add
[
https://issues.apache.org/jira/browse/HDFS-12332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16407151#comment-16407151
]
genericqa commented on HDFS-12332:
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[jira] [Commented] (HDFS-12332) Logging improvement suggestion for SampleStat function MinMax.add
[
https://issues.apache.org/jira/browse/HDFS-12332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16135483#comment-16135483
]
Chen Liang commented on HDFS-12332:
---
Thanks [~xzhao9] for the improvement. One thought, "Updating max value as X"
might not be that useful because it does not say what this value is about. i.e.
a more informative output might be something like "Updating the max value of
metric X from Y to Z". Not sure whether this can be easily done though because
SampleStat seems to be a generic utility class and may not be able to know what
is the "metric X" part.
Also it's possible this can be quite noisy, in which we may want to add some
throttling checks. Lastly, seems to me that {{LOG.trace}} is probably more
suitable than {{LOG.debug}} here.
> Logging improvement suggestion for SampleStat function MinMax.add
> -
>
> Key: HDFS-12332
> URL: https://issues.apache.org/jira/browse/HDFS-12332
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: metrics
>Affects Versions: 3.0.0-alpha4
>Reporter: Xu Zhao
>Priority: Minor
> Attachments: hdfs-12332.patch
>
>
> In order to debug performance anomlies, it is better to see when the max and
> min value get updated in metrics.
> For example, in our workload we would like to see the longest latency of a
> write block request on DataNode.
> The following metric updating code could possibly update the min/max value in
> SampleStat class:
> {code:java}
> datanode.getMetrics().addWriteBlockOp(elapsed());
> datanode.getMetrics().incrWritesFromClient(peer.isLocal(), size);
> {code}
> Here I am attaching an attempt to patch it.
> The patch just adds additional DEBUG level logging in the MinMax class and
> prints the new value when it gets updated.
> Please let me know what you think. For example, if this patch would introduce
> too much noises, what is the best way to trace the read/writeBlock that has
> the minimum/maximum latency?
> Any comments are appreciated!
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[jira] [Commented] (HDFS-12332) Logging improvement suggestion for SampleStat function MinMax.add
[
https://issues.apache.org/jira/browse/HDFS-12332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16135408#comment-16135408
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Hadoop QA commented on HDFS-12332:
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| {color:red}-1{color} | {color:red} unit {color} | {color:red} 8m 16s{color}
| {color:red} hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
30s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 58m 15s{color} |
{color:black} {color} |
\\
\\
|| Reason || Tests ||
| Failed junit tests | hadoop.net.TestDNS |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:14b5c93 |
| JIRA Issue | HDFS-12332 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12882892/hdfs-12332.patch |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
unit findbugs checkstyle |
| uname | Linux 9d869a1894dd 3.13.0-119-generic #166-Ubuntu SMP Wed May 3
12:18:55 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh
|
| git revision | trunk / 267e19a |
| Default Java | 1.8.0_144 |
| findbugs | v3.1.0-RC1 |
| unit |
https://builds.apache.org/job/PreCommit-HDFS-Build/20783/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HDFS-Build/20783/testReport/ |
| modules | C: hadoop-common-project/hadoop-common U:
hadoop-common-project/hadoop-common |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/20783/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> Logging improvement suggestion for SampleStat function MinMax.add
> -
>
> Key: HDFS-12332
> URL: https://issues.apache.org/jira/browse/HDFS-12332
> Project:
