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https://issues.apache.org/jira/browse/NUTCH-2518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16417870#comment-16417870
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ASF GitHub Bot commented on NUTCH-2518:
---------------------------------------
Omkar20895 commented on a change in pull request #307: NUTCH-2518 Cleaning up
the file system after a job failure.
URL: https://github.com/apache/nutch/pull/307#discussion_r177841518
##########
File path: src/java/org/apache/nutch/crawl/CrawlDb.java
##########
@@ -129,17 +129,23 @@ public void update(Path crawlDb, Path[] segments,
boolean normalize,
LOG.info("CrawlDb update: Merging segment data into db.");
}
+ FileSystem fs = crawlDb.getFileSystem(getConf());
+ Path outPath = FileOutputFormat.getOutputPath(job);
try {
- int complete = job.waitForCompletion(true)?0:1;
+ boolean success = job.waitForCompletion(true);
+ if (!success) {
+ String message = "Crawl job did not succeed, job status:"
+ + job.getStatus().getState() + ", reason: "
+ + job.getStatus().getFailureInfo();
+ LOG.error(message);
+ cleanupAfterFailure(outPath, lock, fs);
+ throw new RuntimeException(message);
+ }
} catch (IOException | InterruptedException | ClassNotFoundException e) {
- FileSystem fs = crawlDb.getFileSystem(getConf());
- LockUtil.removeLockFile(fs, lock);
- Path outPath = FileOutputFormat.getOutputPath(job);
- if (fs.exists(outPath))
- fs.delete(outPath, true);
+ LOG.error("Crawl job failed ", e);
Review comment:
Why not shift the sub routine cleanup to the class
nutch/src/java/org/apache/nutch/util/NutchJob.java? This is a nutch job utils
file, I think this would be more appropriate. I have cross checked that cleanup
sub routine would be useful outside crawldb like in hostdb, indexer etc.
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> Must check return value of job.waitForCompletion()
> --------------------------------------------------
>
> Key: NUTCH-2518
> URL: https://issues.apache.org/jira/browse/NUTCH-2518
> Project: Nutch
> Issue Type: Bug
> Components: crawldb, fetcher, generator, hostdb, linkdb
> Affects Versions: 1.15
> Reporter: Sebastian Nagel
> Assignee: Kenneth McFarland
> Priority: Blocker
> Fix For: 1.15
>
>
> The return value of job.waitForCompletion() of the new MapReduce API
> (NUTCH-2375) must always be checked. If it's not true, the job has been
> failed or killed. Accordingly, the program
> - should not proceed with further jobs/steps
> - must clean-up temporary data, unlock CrawlDB, etc.
> - exit with non-zero exit value, so that scripts running the crawl workflow
> can handle the failure
> Cf. NUTCH-2076, NUTCH-2442, [NUTCH-2375 PR
> #221|https://github.com/apache/nutch/pull/221#issuecomment-332941883].
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