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https://issues.apache.org/jira/browse/YARN-9525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16858565#comment-16858565
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Steve Loughran commented on YARN-9525:
--------------------------------------
thomas, HADOOP-13327 tries to nail down hflush/hsync; just pushed a rebase of
it up for people to play with. As with all the other FS contract stuff, it's
invariably spare time, but I'd love to see it in. That adds the output tests
into the existing create contract test, so anyone who implements that suite
gets the new tests automatically
getPos does seem a better strategy here. Adam: what do you think?
FWIW, I think I'd better add getPos() probes to the sync/flush tests. I suspect
we're not updating it reliably enough
> IFile format is not working against s3a remote folder
> -----------------------------------------------------
>
> Key: YARN-9525
> URL: https://issues.apache.org/jira/browse/YARN-9525
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: log-aggregation
> Affects Versions: 3.1.2
> Reporter: Adam Antal
> Assignee: Peter Bacsko
> Priority: Major
> Attachments: IFile-S3A-POC01.patch, YARN-9525-001.patch,
> YARN-9525.002.patch, YARN-9525.003.patch
>
>
> Using the IndexedFileFormat {{yarn.nodemanager.remote-app-log-dir}}
> configured to an s3a URI throws the following exception during log
> aggregation:
> {noformat}
> Cannot create writer for app application_1556199768861_0001. Skip log upload
> this time.
> java.io.IOException: java.io.FileNotFoundException: No such file or
> directory:
> s3a://adamantal-log-test/logs/systest/ifile/application_1556199768861_0001/adamantal-3.gce.cloudera.com_8041
> at
> org.apache.hadoop.yarn.logaggregation.filecontroller.ifile.LogAggregationIndexedFileController.initializeWriter(LogAggregationIndexedFileController.java:247)
> at
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.AppLogAggregatorImpl.uploadLogsForContainers(AppLogAggregatorImpl.java:306)
> at
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.AppLogAggregatorImpl.doAppLogAggregation(AppLogAggregatorImpl.java:464)
> at
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.AppLogAggregatorImpl.run(AppLogAggregatorImpl.java:420)
> at
> org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService$1.run(LogAggregationService.java:276)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.io.FileNotFoundException: No such file or directory:
> s3a://adamantal-log-test/logs/systest/ifile/application_1556199768861_0001/adamantal-3.gce.cloudera.com_8041
> at
> org.apache.hadoop.fs.s3a.S3AFileSystem.s3GetFileStatus(S3AFileSystem.java:2488)
> at
> org.apache.hadoop.fs.s3a.S3AFileSystem.innerGetFileStatus(S3AFileSystem.java:2382)
> at
> org.apache.hadoop.fs.s3a.S3AFileSystem.getFileStatus(S3AFileSystem.java:2321)
> at
> org.apache.hadoop.fs.DelegateToFileSystem.getFileStatus(DelegateToFileSystem.java:128)
> at org.apache.hadoop.fs.FileContext$15.next(FileContext.java:1244)
> at org.apache.hadoop.fs.FileContext$15.next(FileContext.java:1240)
> at org.apache.hadoop.fs.FSLinkResolver.resolve(FSLinkResolver.java:90)
> at org.apache.hadoop.fs.FileContext.getFileStatus(FileContext.java:1246)
> at
> org.apache.hadoop.yarn.logaggregation.filecontroller.ifile.LogAggregationIndexedFileController$1.run(LogAggregationIndexedFileController.java:228)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
> at
> org.apache.hadoop.yarn.logaggregation.filecontroller.ifile.LogAggregationIndexedFileController.initializeWriter(LogAggregationIndexedFileController.java:195)
> ... 7 more
> {noformat}
> This stack trace point to
> {{LogAggregationIndexedFileController$initializeWriter}} where we do the
> following steps (in a non-rolling log aggregation setup):
> - create FSDataOutputStream
> - writing out a UUID
> - flushing
> - immediately after that we call a GetFileStatus to get the length of the log
> file (the bytes we just wrote out), and that's where the failures happens:
> the file is not there yet due to eventual consistency.
> Maybe we can get rid of that, so we can use IFile format against a s3a target.
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