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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13761) S3Guard: implement retries for DDB failures and throttling; translate exceptions
Date Wed, 14 Feb 2018 05:36:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16363517#comment-16363517

Aaron Fabbri commented on HADOOP-13761:

Some entertaining logs from the new scale test introduced here (batch size exceeds provisioned
throughput).  Multiple of seconds of backoff timer.. still never fails though.
DEBUG s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:completeAncestry(548)) - auto-create
ancestor path s3a://bucket-new/scaleTestBWEP0 for child path s3a://bucket-new/scaleTestBWEP0/lvl1/lvl2/lvl3/lvl4/lvl5/lvl6/lvl7/lvl8/lvl9/lvl10/lvl11/lvl12/lvl13/lvl14/lvl15/lvl16/lvl17/lvl18/lvl19/lvl20/lvl21/lvl22/lvl23/lvl2423

DEBUG s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:put(693)) - Saving batch of
25 items to table fabbri-dev3, region us-west-2

DEBUG s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:retryBackoff(660)) - Sleeping
250 msec before next retry

DEBUG s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:retryBackoff(660)) - Sleeping
586 msec before next retry

DEBUG s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:retryBackoff(660)) - Sleeping
747 msec before next retry

DEBUG s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:retryBackoff(660)) - Sleeping
2295 msec before next retry

DEBUG s3guard.DynamoDBMetadataStore (DynamoDBMetadataStore.java:put(681)) - Saving to table
table-dev3 in region us-west-2: PathMetadata{fileStatus=FileStatus{path=s3a{noformat}

> S3Guard: implement retries for DDB failures and throttling; translate exceptions
> --------------------------------------------------------------------------------
>                 Key: HADOOP-13761
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13761
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.0.0-beta1
>            Reporter: Aaron Fabbri
>            Assignee: Aaron Fabbri
>            Priority: Blocker
>         Attachments: HADOOP-13761.001.patch, HADOOP-13761.002.patch
> Following the S3AFileSystem integration patch in HADOOP-13651, we need to add retry logic.
> In HADOOP-13651, I added TODO comments in most of the places retry loops are needed,
> - open(path).  If MetadataStore reflects recent create/move of file path, but we fail
to read it from S3, retry.
> - delete(path).  If deleteObject() on S3 fails, but MetadataStore shows the file exists,
> - rename(src,dest).  If source path is not visible in S3 yet, retry.
> - listFiles(). Skip for now. Not currently implemented in S3Guard. I will create a separate
JIRA for this as it will likely require interface changes (i.e. prefix or subtree scan).
> We may miss some cases initially and we should do failure injection testing to make sure
we're covered.  Failure injection tests can be a separate JIRA to make this easier to review.
> We also need basic configuration parameters around retry policy.  There should be a way
to specify maximum retry duration, as some applications would prefer to receive an error eventually,
than waiting indefinitely.  We should also be keeping statistics when inconsistency is detected
and we enter a retry loop.

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