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Retry intermittent S3 download failures #594
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This builds on the recent work in botocore (boto/botocore#210) to address two things: * ensure than any .read() call used from the streaming response of `GetObject` will never hang. We do this by applying a timeout to the underlying socket. * Catch and retry IncompleteReadError. There may be times when we don't receive all of the contents from a `GetObject` request such that amount_read != content-length header. Botocore now checks this and raises an exception, which the CLI now catches and retries.
@@ -292,17 +298,30 @@ class DownloadPartTask(object): | |||
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# Amount to read from response body at a time. | |||
ITERATE_CHUNK_SIZE = 1024 * 1024 | |||
READ_TIMEOUT = 60 | |||
TOTAL_ATTEMPTS = 5 |
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Where does this come from? Given our typical number of retries is 6, I'm just curious.
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I believe botocore uses 5 by default (except for special cases like ddb).
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TIL: https://github.com/boto/botocore/blob/develop/botocore/data/aws/_retry.json#L46-L53 Good to know, thanks.
LGTM otherwise. |
LGTM |
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This builds on the recent work in botocore
(boto/botocore#210) to address two things:
GetObject
will never hang. We do this by applying a timeoutto the underlying socket.
don't receive all of the contents from a
GetObject
request suchthat amount_read != content-length header. Botocore now checks
this and raises an exception, which the CLI now catches and retries.