Ivan Andika created HDDS-10587:
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Summary: Reset the thread-local MessageDigest instance during
exception
Key: HDDS-10587
URL: https://issues.apache.org/jira/browse/HDDS-10587
Project: Apache Ozone
Issue Type: Improvement
Components: S3, s3gateway
Reporter: Ivan Andika
Assignee: Ivan Andika
Currently, the MessageDigest instance is a thread local variable (one per S3G
Jetty thread). MessageDigest requires the call to either MessageDigest#digest
or MessageDigest#reset to reset the digest.
In normal ObjectEndpoint#put flow, MessageDigest#digest is called after the
data has been written to the datanodes, before the key is committed. However,
if an IOException happens (e.g. EOFException due to client cancelling during
the write), the digest will not be reset and remains in the inconsistent state.
This will affect the subsequent request that uses the same thread and therefore
the ETag generated will be completely different from the md5 hash of the object.
The issue can be replicated using an S3G with a single thread and doing three
put-object operations for the same key and same payload.
1st put-object: cancel the operation before it put-object operation can finish
2nd put-object: let the put-object finish. The resulting ETag will not be the
same as the md5 sum.
3rd put-object: also let the put-object finish. Since the previous put-object
reset the digest, the resulting ETag will be correct.
This patch adds a call to MessageDigest#reset in ObjectEndpoint#put to reset
the digest in case of exception.
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