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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-13793) s3guard: add inconsistency injection, integration tests
Date Fri, 18 Nov 2016 00:28:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron Fabbri updated HADOOP-13793:
----------------------------------
    Attachment: HADOOP-13793-HADOOP-13345.001.patch

Attaching v1 patch.

This adds a new integration test, {{ITestS3GuardListConsistency}} which sets up the failure
(inconsistency) injection and enables the in-memory MetadataStore, then asserts that listStatus()
is consistent even though visibility of one of the paths it creates has been delayed.

To accomplish the inconsistency injection, I

- Promoted DefaultS3ClientFactory to a top-level class (it was an internal class in S3ClientFactory
interface)
- Pulled out the one-line call to construct a AmazonS3Client into an overridable function.
- Create new class InconsistentS3ClientFactory which just subclases DefaultS3ClientFactory
and creates InconsistentS3Client instead of AmazonS3Client.
- Created new class InconsistentS3Client which wraps AmazonS3Client, and delays listObjects()
visibility of any keys which match a given substring by 500 msec after they are created.

I confirmed that, in ITestS3GuardListConsistency, if you comment out this line, the test will
fail:

{code}
+    conf.setClass(S3Guard.S3_METADATA_STORE_IMPL, LocalMetadataStore.class,
+        MetadataStore.class);
{code}



> s3guard: add inconsistency injection, integration tests
> -------------------------------------------------------
>
>                 Key: HADOOP-13793
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13793
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Aaron Fabbri
>            Assignee: Aaron Fabbri
>         Attachments: HADOOP-13793-HADOOP-13345.001.patch
>
>
> Many of us share concerns that testing the consistency features of S3Guard will be difficult
if we depend on the rare and unpredictable occurrence of actual inconsistency in S3 to exercise
those code paths.
> I think we should have a mechanism for injecting failure to force exercising of the consistency
codepaths in S3Guard.
> Requirements:
> - Integration tests that cause S3A to see the types of inconsistency we address with
S3Guard.
> - These are deterministic integration tests.
> Unit tests are possible as well, if we were to stub out the S3Client.  That may be less
bang for the buck, though.



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