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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14028) S3A block output streams don't clear temporary files
Date Wed, 01 Feb 2017 13:34:54 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15848373#comment-15848373

Steve Loughran commented on HADOOP-14028:

Although we have that cleanup patch, I'm still worried about streams not being closed when
sent up with the xfer manager. I think we should be explicitly closing them ourselves just
to make sure.

I've tweaked the code so that the disk output stream logs a full stack trace at debug in close(),
which makes it easier to spot in the logs, and shows where closure kicks in

single blob PUT
2017-02-01 13:28:51,451 [s3a-transfer-shared-pool1-t2] DEBUG s3a.S3ADataBlocks (S3ADataBlocks.java:close(884))
- Block[1] closing stream of buffer file target/build/test/s3a/s3ablock-0001-8454965610295305282.tmp
2017-02-01 13:28:51,452 [s3a-transfer-shared-pool1-t2] DEBUG s3a.S3ADataBlocks (S3ADataBlocks.java:close(889))
- stack: 
java.io.IOException: Output stream closed
	at org.apache.hadoop.fs.s3a.S3ADataBlocks$DiskBlock$DiskBlockInputStream.close(S3ADataBlocks.java:888)
	at com.amazonaws.internal.ReleasableInputStream.doRelease(ReleasableInputStream.java:84)
	at com.amazonaws.internal.ReleasableInputStream.close(ReleasableInputStream.java:68)
	at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:89)
	at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:89)
	at java.io.BufferedInputStream.close(BufferedInputStream.java:483)
	at com.amazonaws.internal.SdkBufferedInputStream.close(SdkBufferedInputStream.java:93)
	at com.amazonaws.internal.SdkFilterInputStream.close(SdkFilterInputStream.java:89)
	at com.amazonaws.event.ProgressInputStream.close(ProgressInputStream.java:182)
	at com.amazonaws.util.IOUtils.closeQuietly(IOUtils.java:71)
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:322)
	at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3785)
	at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1472)
	at org.apache.hadoop.fs.s3a.S3AFileSystem.putObjectDirect(S3AFileSystem.java:1090)
	at org.apache.hadoop.fs.s3a.S3ABlockOutputStream$1.call(S3ABlockOutputStream.java:397)
	at org.apache.hadoop.fs.s3a.S3ABlockOutputStream$1.call(S3ABlockOutputStream.java:392)
	at org.apache.hadoop.fs.s3a.SemaphoredDelegatingExecutor$CallableWithPermitRelease.call(SemaphoredDelegatingExecutor.java:222)
	at org.apache.hadoop.fs.s3a.SemaphoredDelegatingExecutor$CallableWithPermitRelease.call(SemaphoredDelegatingExecutor.java:222)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
2017-02-01 13:28:51,455 [s3a-transfer-shared-pool1-t2] DEBUG s3a.S3ABlockOutputStream (S3ABlockOutputStream.java:call(399))
- Closing block {} after put operation
2017-02-01 13:28:51,455 [s3a-transfer-shared-pool1-t2] DEBUG s3a.S3ADataBlocks (S3ADataBlocks.java:enterState(167))
- FileBlock{index=1, destFile=target/build/test/s3a/s3ablock-0001-8454965610295305282.tmp,
state=Upload, dataSize=16, limit=5242880}: entering state Closed

There is no stack trace in the multipart upload via the transfer manager, anywhere in the
test run. It's streams are not being closed.

> S3A block output streams don't clear temporary files
> ----------------------------------------------------
>                 Key: HADOOP-14028
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14028
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/s3
>    Affects Versions: 3.0.0-alpha2
>         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
> 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
> 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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