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https://issues.apache.org/jira/browse/FLINK-10963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701719#comment-16701719
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ASF GitHub Bot commented on FLINK-10963:
----------------------------------------
igalshilman commented on a change in pull request #7161:
[FLINK-10963][fs-connector, s3] Cleanup tmp S3 objects uploaded as backups of
in-progress files.
URL: https://github.com/apache/flink/pull/7161#discussion_r237019983
##########
File path:
flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/writer/S3RecoverableMultipartUploadFactory.java
##########
@@ -86,36 +84,20 @@ RecoverableMultiPartUpload
recoverRecoverableUpload(S3Recoverable recoverable) t
incompletePart);
}
- @VisibleForTesting
- Optional<File> downloadLastDataChunk(S3Recoverable recoverable) throws
IOException {
+ private Optional<File> recoverInProgressPart(S3Recoverable recoverable)
throws IOException {
- final String objectName = recoverable.incompleteObjectName();
- if (objectName == null) {
+ final String objectKey = recoverable.incompleteObjectName();
+ if (objectKey == null) {
return Optional.empty();
}
// download the file (simple way)
- final RefCountedFile fileAndStream =
tmpFileSupplier.apply(null);
- final File file = fileAndStream.getFile();
-
- long numBytes = 0L;
-
- try (
- final OffsetAwareOutputStream outStream =
fileAndStream.getStream();
- final org.apache.hadoop.fs.FSDataInputStream
inStream =
- fs.open(new
org.apache.hadoop.fs.Path('/' + objectName))
- ) {
- final byte[] buffer = new byte[32 * 1024];
-
- int numRead;
- while ((numRead = inStream.read(buffer)) > 0) {
- outStream.write(buffer, 0, numRead);
- numBytes += numRead;
- }
- }
+ final RefCountedFile refCountedFile =
tmpFileSupplier.apply(null);
+ final File file = refCountedFile.getFile();
+ final long numBytes = s3AccessHelper.getObject(objectKey, file);
// some sanity checks
- if (numBytes != file.length() || numBytes !=
fileAndStream.getStream().getLength()) {
+ if (numBytes != file.length()) {
Review comment:
I wonder if the check actually belongs here. IMO it should be probably done
at the s3AccessHelper.
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> Cleanup small objects uploaded to S3 as independent objects
> -----------------------------------------------------------
>
> Key: FLINK-10963
> URL: https://issues.apache.org/jira/browse/FLINK-10963
> Project: Flink
> Issue Type: Sub-task
> Components: filesystem-connector
> Affects Versions: 1.7.0
> Reporter: Kostas Kloudas
> Assignee: Kostas Kloudas
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.1
>
>
> The S3 {{RecoverableWriter}} uses the Multipart Upload (MPU) Feature of S3 in
> order to upload the different part files. This means that a large part is
> split in chunks of at least 5MB which are uploaded independently, whenever
> each one of them is ready.
> This 5MB minimum size requires special handling of parts that are less than
> 5MB when a checkpoint barrier arrives. These small files are uploaded as
> independent objects (not associated with an active MPU). This way, when Flink
> needs to restore, it simply downloads them and resumes writing to them.
> These small objects are currently not cleaned up, thus leading to wasted
> space on S3.
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