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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10417) Improve error message from checkBlockLocalPathAccess
Date Thu, 19 May 2016 18:56:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15291933#comment-15291933
] 

Hadoop QA commented on HDFS-10417:
----------------------------------

| (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 13s {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:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 0s {color}
| {color:green} The patch appears to include 1 new or modified test files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m 38s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 55s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 33s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 4s {color} | {color:green}
trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 13s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 6s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 19s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 6s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 53s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 53s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 27s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m 5s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 11s {color}
| {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s {color} | {color:red}
The patch has 2 line(s) that end in whitespace. Use git apply --whitespace=fix. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 2s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m 10s {color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 62m 19s {color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 19s {color}
| {color:green} Patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 85m 52s {color} | {color:black}
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.datanode.TestFsDatasetCache |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:2c91fd8 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12804983/HDFS-10417.002.patch
|
| JIRA Issue | HDFS-10417 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux 2768d1cfd6d0 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 |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 141873c |
| Default Java | 1.8.0_91 |
| findbugs | v3.0.0 |
| whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/15496/artifact/patchprocess/whitespace-eol.txt
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/15496/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
| unit test logs |  https://builds.apache.org/job/PreCommit-HDFS-Build/15496/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/15496/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/15496/console |
| Powered by | Apache Yetus 0.2.0   http://yetus.apache.org |


This message was automatically generated.



> Improve error message from checkBlockLocalPathAccess
> ----------------------------------------------------
>
>                 Key: HDFS-10417
>                 URL: https://issues.apache.org/jira/browse/HDFS-10417
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.2
>            Reporter: Tianyin Xu
>            Assignee: Tianyin Xu
>            Priority: Minor
>             Fix For: 2.8.0
>
>         Attachments: HDFS-10417.000.patch, HDFS-10417.001.patch, HDFS-10417.002.patch
>
>
> The exception msg thrown by {{checkBlockLocalPathAccess}} is very specific to the implementation
detail. It's really hard for users to understand it unless she reads and understands the code.

> The code is shown as follows:
> {code:title=org.apache.hadoop.hdfs.server.datanode.DataNode|borderStyle=solid}
>   private void checkBlockLocalPathAccess() throws IOException {
>     checkKerberosAuthMethod("getBlockLocalPathInfo()");
>     String currentUser = UserGroupInformation.getCurrentUser().getShortUserName();
>     if (!usersWithLocalPathAccess.contains(currentUser)) {
>       throw new AccessControlException(
>           "Can't continue with getBlockLocalPathInfo() "
>               + "authorization. The user " + currentUser
>               + " is not allowed to call getBlockLocalPathInfo");
>     }    
>   }
> {code}
> (basically she needs to understand the code logic of getBlockLocalPathInfo)
> \\
> Note that {{usersWithLocalPathAccess}} is a *private final* purely coming from the configuration
settings of {{dfs.block.local-path-access.user}},
> {code:title=org.apache.hadoop.hdfs.server.datanode.DataNode|borderStyle=solid}
> private final List<String> usersWithLocalPathAccess;
> ....
> this.usersWithLocalPathAccess = Arrays.asList(
>     conf.getTrimmedStrings(DFSConfigKeys.DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY));
> {code}
> In other word, the checking fails simply because the current user is not specified in
the configuration setting of {{dfs.block.local-path-access.user}}. The log message should
be much more clearer to make it easy for users to take actions, as demonstrated in the attached
patch. 
> Thanks!



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