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https://issues.apache.org/jira/browse/HADOOP-13345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16014702#comment-16014702
]
Steve Loughran commented on HADOOP-13345:
-----------------------------------------
Think I may have hit my first inconsistency BTW, in a localdb s3guard test.
open() worked, but the first attempt to read the file triggered the FNFE.
As discussed on HADOOP-14303; we should consider what our retry policy is. Here
I think 404 -> fail fast.
+ S3aInputStream retries on some non-recoverable events, as it does one extra
attempt on any exception. This can lead to 404s triggering a retry rather than
fail fast.
{code}
testSequentialRead(org.apache.hadoop.fs.contract.s3a.ITestS3AContractOpen)
Time elapsed: 1.221 sec <<< ERROR!
java.io.FileNotFoundException: Reopen at position 0 on
s3a://hwdev-steve-ireland-new/fork-0007/test/testsequentialread.txt:
com.amazonaws.services.s3.model.AmazonS3Exception: The specified key does not
exist. (Service: Amazon S3; Status Code: 404; Error Code: NoSuchKey; Request
ID: 8D81F218D02DE21E), S3 Extended Request ID:
aXUWP6yYGSsP9ofVawyIteGZWBmkNTFjmRCvwAR1KyJmtR0A6H6UOggE4OlYB2ZOJ99F3MV74fU=
at
org.apache.hadoop.fs.s3a.S3AUtils.translateException(S3AUtils.java:166)
at
org.apache.hadoop.fs.s3a.S3AInputStream.reopen(S3AInputStream.java:165)
at
org.apache.hadoop.fs.s3a.S3AInputStream.onReadFailure(S3AInputStream.java:348)
at org.apache.hadoop.fs.s3a.S3AInputStream.read(S3AInputStream.java:321)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at
org.apache.hadoop.fs.contract.AbstractContractOpenTest.testSequentialRead(AbstractContractOpenTest.java:156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
at
org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
Caused by: com.amazonaws.services.s3.model.AmazonS3Exception: The specified key
does not exist. (Service: Amazon S3; Status Code: 404; Error Code: NoSuchKey;
Request ID: 8D81F218D02DE21E)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1586)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1254)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1035)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:747)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:721)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:704)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:672)
at
com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:654)
at
com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:518)
at
com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:4185)
at
com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:4132)
at
com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:1373)
at
org.apache.hadoop.fs.s3a.S3AInputStream.reopen(S3AInputStream.java:158)
at
org.apache.hadoop.fs.s3a.S3AInputStream.onReadFailure(S3AInputStream.java:348)
at org.apache.hadoop.fs.s3a.S3AInputStream.read(S3AInputStream.java:321)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at
org.apache.hadoop.fs.contract.AbstractContractOpenTest.testSequentialRead(AbstractContractOpenTest.java:156)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
at
org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
{code}
> S3Guard: Improved Consistency for S3A
> -------------------------------------
>
> Key: HADOOP-13345
> URL: https://issues.apache.org/jira/browse/HADOOP-13345
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs/s3
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Attachments: HADOOP-13345.prototype1.patch, s3c.001.patch,
> S3C-ConsistentListingonS3-Design.pdf, S3GuardImprovedConsistencyforS3A.pdf,
> S3GuardImprovedConsistencyforS3AV2.pdf
>
>
> This issue proposes S3Guard, a new feature of S3A, to provide an option for a
> stronger consistency model than what is currently offered. The solution
> coordinates with a strongly consistent external store to resolve
> inconsistencies caused by the S3 eventual consistency model.
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