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https://issues.apache.org/jira/browse/HADOOP-13489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15419703#comment-15419703
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Ted Yu commented on HADOOP-13489:
---------------------------------
Discussed with Mingliang offline about the case I observed from hbase test.
The intricacy was that although the distcp job wasn't successful, the following
code wasn't executed - I don't see "Exception encountered " in the log:
{code}
} catch (Exception e) {
LOG.error("Exception encountered ", e);
return DistCpConstants.UNKNOWN_ERROR;
{code}
Will attach hbase test output and related class shortly.
> DistCp may incorrectly return success status when the underlying Job failed
> ---------------------------------------------------------------------------
>
> Key: HADOOP-13489
> URL: https://issues.apache.org/jira/browse/HADOOP-13489
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: HADOOP-13489.v1.patch, HADOOP-13489.v2.patch,
> HADOOP-13489.v3.patch, TestIncrementalBackup-output.txt
>
>
> I was troubleshooting HBASE-14450 where at the end of BackupdistCp#execute(),
> distcp job was marked unsuccessful (BackupdistCp is a wrapper of DistCp).
> Yet in IncrementalTableBackupProcedure#incrementalCopy(), the return value
> from copyService.copy() was 0.
> Here is related code from DistCp:
> {code}
> 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 (AclsNotSupportedException e) {
> LOG.error("ACLs not supported on at least one file system: ", e);
> return DistCpConstants.ACLS_NOT_SUPPORTED;
> } catch (XAttrsNotSupportedException e) {
> LOG.error("XAttrs not supported on at least one file system: ", e);
> return DistCpConstants.XATTRS_NOT_SUPPORTED;
> } catch (Exception e) {
> LOG.error("Exception encountered ", e);
> return DistCpConstants.UNKNOWN_ERROR;
> }
> return DistCpConstants.SUCCESS;
> {code}
> We don't check whether the Job returned by execute() was successful.
> Even if the Job fails, DistCpConstants.SUCCESS is returned.
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