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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11758) libhdfs++: Catch exceptions thrown by runtime hooks
Date Thu, 04 May 2017 21:54:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15997498#comment-15997498
] 

Hadoop QA commented on HDFS-11758:
----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 17m 32s{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} 10m 50s{color}
| {color:green} HDFS-8707 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 26s{color} |
{color:green} HDFS-8707 passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 22s{color} |
{color:green} HDFS-8707 passed with JDK v1.7.0_121 {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 17s{color} |
{color:green} HDFS-8707 passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 14s{color}
| {color:green} HDFS-8707 passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m  9s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 19s{color} |
{color:green} the patch passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  6m 19s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  6m 19s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  6m 28s{color} |
{color:green} the patch passed with JDK v1.7.0_121 {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green}  6m 28s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  6m 28s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 13s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m  9s{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} unit {color} | {color:green}  9m  3s{color} | {color:green}
hadoop-hdfs-native-client in the patch passed with JDK v1.7.0_121. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 18s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 75m 18s{color} | {color:black}
{color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:78fc6b6 |
| JIRA Issue | HDFS-11758 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12866488/HDFS-11758.HDFS-8707.000.patch
|
| Optional Tests |  asflicense  compile  cc  mvnsite  javac  unit  |
| uname | Linux b6b08b60fe14 3.13.0-108-generic #155-Ubuntu SMP Wed Jan 11 16:58:52 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | HDFS-8707 / e73bd53 |
| Default Java | 1.7.0_121 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_131 /usr/lib/jvm/java-7-openjdk-amd64:1.7.0_121
|
| JDK v1.7.0_121  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/19317/testReport/
|
| modules | C: hadoop-hdfs-project/hadoop-hdfs-native-client U: hadoop-hdfs-project/hadoop-hdfs-native-client
|
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/19317/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> libhdfs++: Catch exceptions thrown by runtime hooks
> ---------------------------------------------------
>
>                 Key: HDFS-11758
>                 URL: https://issues.apache.org/jira/browse/HDFS-11758
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-11758.HDFS-8707.000.patch
>
>
> Right now there's nothing to stop a user supplied event callback from throwing and unwinding
the stack on the asio worker thread.  This can lead to async filesystem operations that never
complete because the stack was unwound before setting up the next async io call.
> Best practice is to be really careful about what is done inside event hooks and callbacks:
don't throw, sleep, or anything else that might block.  I've seen a few issues pop up because
a hook was made for monitoring purposes and later on stuff that was able to throw was added
without realizing where the exception may end up.



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