[
https://issues.apache.org/jira/browse/SQOOP-3378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16649977#comment-16649977
]
Szabolcs Vasas commented on SQOOP-3378:
---------------------------------------
Hi [~dvoros],
It seems TestNetezzaExternalTableExportMapper is still failing on the Apache
Jenkins server and I have also managed to reproduce the issue locally by
running the unit tests in 1 JVM.
Do you have any idea what can cause this hanging issue?
I have seen "Need to open FIFO for reading, otherwise writing would hang"
comment in the patch so I thought you might have encountered similar thing
during the development.
The branch I used to reproduce the issue is this:
[https://github.com/szvasas/sqoop/commits/SQOOP-3104]
If you execute ./gradlew unitTest then it would hang when executing
TestNetezzaExternalTableExportMapper.
> Error during direct Netezza import/export can interrupt process in
> uncontrolled ways
> ------------------------------------------------------------------------------------
>
> Key: SQOOP-3378
> URL: https://issues.apache.org/jira/browse/SQOOP-3378
> Project: Sqoop
> Issue Type: Bug
> Affects Versions: 1.4.7
> Reporter: Daniel Voros
> Assignee: Daniel Voros
> Priority: Major
> Fix For: 1.5.0, 3.0.0
>
> Attachments: SQOOP-3378.2.patch
>
>
> SQLException during JDBC operation in direct Netezza import/export signals
> parent thread to fail fast by interrupting it (see
> [here|https://github.com/apache/sqoop/blob/c814e58348308b05b215db427412cd6c0b21333e/src/java/org/apache/sqoop/mapreduce/db/netezza/NetezzaJDBCStatementRunner.java#L92]).
> We're [trying to process the interrupt in the
> parent|https://github.com/apache/sqoop/blob/c814e58348308b05b215db427412cd6c0b21333e/src/java/org/apache/sqoop/mapreduce/db/netezza/NetezzaExternalTableExportMapper.java#L232]
> (main) thread, but there's no guarantee that we're not in some blocking
> internal call that will process the interrupted flag and reset it before
> we're able to check.
> It is also possible that the parent thread has passed the "checking part"
> when it gets interrupted. In case of {{NetezzaExternalTableExportMapper}}
> this can interrupt the upload of log files.
> I'd recommend using some other means of communication between the threads
> than interrupts.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
