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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14069) Better debuggability for datanode decommissioning
Date Tue, 13 Nov 2018 00:09:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16684527#comment-16684527
] 

Hadoop QA commented on HDFS-14069:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 20s{color} | {color:blue}
Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m 11s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 58s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 59s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m  5s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green} 13m 58s{color}
| {color:green} branch has no errors when building and testing our client artifacts. {color}
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| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m  2s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 49s{color} |
{color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red}  0m 34s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  0m 41s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  0m 41s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  0m 56s{color}
| {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch generated 8 new + 649 unchanged
- 0 fixed = 657 total (was 649) {color} |
| {color:red}-1{color} | {color:red} mvnsite {color} | {color:red}  0m 36s{color} | {color:red}
hadoop-hdfs in the patch failed. {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:red}-1{color} | {color:red} shadedclient {color} | {color:red}  3m 39s{color} | {color:red}
patch has errors when building and testing our client artifacts. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  0m 26s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 45s{color} |
{color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  0m 36s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 22s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 48m 26s{color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:8f97d6f |
| JIRA Issue | HDFS-14069 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12947912/HDFS-14069.000.patch
|
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit
 shadedclient  findbugs  checkstyle  xml  |
| uname | Linux ab208045e22f 3.13.0-143-generic #192-Ubuntu SMP Tue Feb 27 10:45:36 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / e269c3f |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC1 |
| mvninstall | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/artifact/out/patch-mvninstall-hadoop-hdfs-project_hadoop-hdfs.txt
|
| compile | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/artifact/out/patch-compile-hadoop-hdfs-project_hadoop-hdfs.txt
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| javac | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/artifact/out/patch-compile-hadoop-hdfs-project_hadoop-hdfs.txt
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| checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/artifact/out/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
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| mvnsite | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/artifact/out/patch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt
|
| findbugs | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/artifact/out/patch-findbugs-hadoop-hdfs-project_hadoop-hdfs.txt
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/testReport/ |
| Max. process+thread count | 306 (vs. ulimit of 10000) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/25495/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Better debuggability for datanode decommissioning
> -------------------------------------------------
>
>                 Key: HDFS-14069
>                 URL: https://issues.apache.org/jira/browse/HDFS-14069
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, hdfs, namenode
>            Reporter: Danny Becker
>            Assignee: Danny Becker
>            Priority: Major
>         Attachments: HDFS-14069.000.patch
>
>
> Currently, we don't provide any debugging info for decommissioning DN, it is difficult
to determine which blocks are on their last replica. We have two design options:
>  # Add block info for blocks with low replication (configurable)
>  ** Advantages:
>  *** Initial debugging information would be more thorough
>  *** Easier initial implementation
>  ** Disadvantages:
>  *** Add load to normal NN operation by checking every time a DN is decommissioned
>  *** More difficult to add debugging information later on
>  # Create a new api for querying more detailed info about one DN
>  ** Advantages:
>  *** We wouldnt be adding more load to the NN in normal operation
>  *** Much easier to extend in the future with more info
>  ** Disadvantages:
>  *** Getting the info on demand for this case will be much more expensive actually, cause
we will have to find all the blocks on that DN, and then go through all the blocks again and
count how many replicas we have etc.



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