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Posted to mapreduce-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2015/06/30 07:33:05 UTC
[jira] [Commented] (MAPREDUCE-5549) distcp app should fail if m/r
job fails
[ https://issues.apache.org/jira/browse/MAPREDUCE-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14607531#comment-14607531 ]
Hadoop QA commented on MAPREDUCE-5549:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | patch | 0m 0s | The patch command could not apply the patch during dryrun. |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12653802/MAPREDUCE-5549-002.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / d3797f9 |
| Console output | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5862/console |
This message was automatically generated.
> distcp app should fail if m/r job fails
> ---------------------------------------
>
> Key: MAPREDUCE-5549
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5549
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distcp, mrv2
> Affects Versions: 3.0.0
> Reporter: David Rosenstrauch
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-5549-001.patch, MAPREDUCE-5549-002.patch
>
>
> I run distcpv2 in a scripted manner. The script checks if the distcp step fails and, if so, aborts the rest of the script. However, I ran into an issue today where the distcp job failed, but my calling script went on its merry way.
> Digging into the code a bit more (at https://svn.apache.org/repos/asf/hadoop/common/trunk/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCp.java), I think I see the issue: the distcp app is not returning an error exit code to the shell when the distcp job fails. This is a big problem, IMO, as it prevents distcp from being successfully used in a scripted environment. IMO, the code should change like so:
> Before:
> {code:title=org.apache.hadoop.tools.DistCp.java}
> //...
> public int run(String[] argv) {
> //...
> try {
> execute();
> } catch (InvalidInputException e) {
> LOG.error("Invalid input: ", e);
> return DistCpConstants.INVALID_ARGUMENT;
> } catch (DuplicateFileException e) {
> LOG.error("Duplicate files in input path: ", e);
> return DistCpConstants.DUPLICATE_INPUT;
> } catch (Exception e) {
> LOG.error("Exception encountered ", e);
> return DistCpConstants.UNKNOWN_ERROR;
> }
> return DistCpConstants.SUCCESS;
> }
> //...
> {code}
> After:
> {code:title=org.apache.hadoop.tools.DistCp.java}
> //...
> public int run(String[] argv) {
> //...
> Job job = null;
> try {
> job = execute();
> } catch (InvalidInputException e) {
> LOG.error("Invalid input: ", e);
> return DistCpConstants.INVALID_ARGUMENT;
> } catch (DuplicateFileException e) {
> LOG.error("Duplicate files in input path: ", e);
> return DistCpConstants.DUPLICATE_INPUT;
> } catch (Exception e) {
> LOG.error("Exception encountered ", e);
> return DistCpConstants.UNKNOWN_ERROR;
> }
> if (job.isSuccessful()) {
> return DistCpConstants.SUCCESS;
> }
> else {
> return DistCpConstants.UNKNOWN_ERROR;
> }
> }
> //...
> {code}
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