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https://issues.apache.org/jira/browse/STORM-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196044#comment-14196044
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ASF GitHub Bot commented on STORM-442:
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Github user itaifrenkel commented on the pull request:
https://github.com/apache/storm/pull/305#issuecomment-61631559
@clockfly - Please clarify. When you say "the parent process fails" do you
mean that the worker process is no longer running? If this is the case that
process cannot call cleanup() since it is not running. We are using os specific
hooks in the child process to receive signal when parent process dies. Another
cross platform alternative is using file lock checks. Either way, are you sure
this is related to this pull request ?
> multilang ShellBolt/ShellSpout die() can be hang when Exception happened
> ------------------------------------------------------------------------
>
> Key: STORM-442
> URL: https://issues.apache.org/jira/browse/STORM-442
> Project: Apache Storm
> Issue Type: Bug
> Affects Versions: 0.9.3
> Reporter: DashengJu
>
> In ShellBolt, the _readerThread read command from python/shell process, and
> handle like this:
> try {
> ShellMsg shellMsg = _process.readShellMsg();
> ...
> } catch (InterruptedException e) {
> } catch (Throwable t) {
> die(t);
> }
> And in the die function, getProcessTerminationInfoString will read
> getErrorsString() from processErrorStream.
> private void die(Throwable exception) {
>
> String processInfo = _process.getProcessInfoString() +
> _process.getProcessTerminationInfoString();
>
> _exception = new RuntimeException(processInfo, exception);
>
> }
> so when ShellBolt got exception(for example, readShellMsg() throw NPE ) ,
> but it is not an error from sub process, then
> getProcessTerminationInfoString will be hang because processErrorStream have
> no data to read.
> On the other hand, as [~xiaokang] says ShellBolt should fail fast on
> exception ( https://github.com/apache/incubator-storm/pull/46 ) , I think it
> is not a good idea to read error info from stream.
> Because [~xiaokang] 's PR is based old version, so I will move his code to
> this PR, and modify some other place in ShellSpout.
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