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https://issues.apache.org/jira/browse/HADOOP-13786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15844052#comment-15844052
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Steve Loughran commented on HADOOP-13786:
-----------------------------------------
MR test failure assumed spurious:
{code}
java.util.ServiceConfigurationError:
org.apache.hadoop.security.token.TokenIdentifier: Provider
org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier not found
at java.util.ServiceLoader.fail(ServiceLoader.java:239)
at java.util.ServiceLoader.access$300(ServiceLoader.java:185)
at
java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:372)
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
at
org.apache.hadoop.security.token.Token.getClassForIdentifier(Token.java:149)
at
org.apache.hadoop.security.token.Token.decodeIdentifier(Token.java:170)
at
org.apache.hadoop.security.token.Token.identifierToString(Token.java:425)
at org.apache.hadoop.security.token.Token.toString(Token.java:445)
at java.lang.String.valueOf(String.java:2994)
at java.lang.StringBuilder.append(StringBuilder.java:131)
at
org.apache.hadoop.mapreduce.security.TokenCache.obtainTokensForNamenodesInternal(TokenCache.java:143)
at
org.apache.hadoop.mapreduce.security.TestTokenCache.testBinaryCredentials(TestTokenCache.java:116)
at
org.apache.hadoop.mapreduce.security.TestTokenCache.testBinaryCredentialsWithoutScheme(TestTokenCache.java:67)
{code}
otherwise, there isn't enough test coverage, or even the MR integration, for
this to be ready to think about committing. I've stuck it up to give people
progress.
Key point: we can use delayed MPU completion for 0-rename writes, caching the
information needed for the operation in S3 itself. We are yet to show that this
works for MR code
> Add S3Guard committer for zero-rename commits to consistent S3 endpoints
> ------------------------------------------------------------------------
>
> Key: HADOOP-13786
> URL: https://issues.apache.org/jira/browse/HADOOP-13786
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs/s3
> Affects Versions: HADOOP-13345
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: HADOOP-13786-HADOOP-13345-001.patch,
> HADOOP-13786-HADOOP-13345-002.patch
>
>
> A goal of this code is "support O(1) commits to S3 repositories in the
> presence of failures". Implement it, including whatever is needed to
> demonstrate the correctness of the algorithm. (that is, assuming that s3guard
> provides a consistent view of the presence/absence of blobs, show that we can
> commit directly).
> I consider ourselves free to expose the blobstore-ness of the s3 output
> streams (ie. not visible until the close()), if we need to use that to allow
> us to abort commit operations.
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