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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14028) S3A block output streams don't delete temporary files in multipart uploads
Date Thu, 02 Feb 2017 22:20:51 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-14028:
------------------------------------
    Attachment: HADOOP-14028-branch-2.8-003.patch

HADOOP-14028 Patch 003
pulls in some of the changes coming in to HADOOP-13786 just to move the put/multipart put
operations into the right place, and to do more diagnostics on block operations, plus the
various checkstyle complaints.

Based on some feedback from the SDK team, we must explicitly close the blocks on multipart,
releasing the files. We do not need to do this for the putObject call. The disk block is now
modified to delete the file in its close() as well as the stream: whichever closes first wins.

> S3A block output streams don't delete temporary files in multipart uploads
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-14028
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14028
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/s3
>    Affects Versions: 2.8.0
>         Environment: JDK 8 + ORC 1.3.0 + hadoop-aws 3.0.0-alpha2
>            Reporter: Seth Fitzsimmons
>            Assignee: Steve Loughran
>         Attachments: HADOOP-14028-branch-2-001.patch, HADOOP-14028-branch-2.8-002.patch,
HADOOP-14028-branch-2.8-003.patch
>
>
> I have `fs.s3a.fast.upload` enabled with 3.0.0-alpha2 (it's exactly what I was looking
for after running into the same OOM problems) and don't see it cleaning up the disk-cached
blocks.
> I'm generating a ~50GB file on an instance with ~6GB free when the process starts. My
expectation is that local copies of the blocks would be deleted after those parts finish uploading,
but I'm seeing more than 15 blocks in /tmp (and none of them have been deleted thus far).
> I see that DiskBlock deletes temporary files when closed, but is it closed after individual
blocks have finished uploading or when the entire file has been fully written to the FS (full
upload completed, including all parts)?
> As a temporary workaround to avoid running out of space, I'm listing files, sorting by
atime, and deleting anything older than the first 20: `ls -ut | tail -n +21 | xargs rm`
> Steve Loughran says:
> > They should be deleted as soon as the upload completes; the close() call that the
AWS httpclient makes on the input stream triggers the deletion. Though there aren't tests
for it, as I recall.



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