Siyao Meng created HDDS-7871:
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Summary: Improve key prefix verification in createFakeDirIfShould
Key: HDDS-7871
URL: https://issues.apache.org/jira/browse/HDDS-7871
Project: Apache Ozone
Issue Type: Bug
Reporter: Siyao Meng
h2. Background
{{KeyManagerImpl#createFakeDirIfShould}} is intended to return a "fake"
OmKeyInfo entry for a directory to the client in the case of OBS or LEGACY
bucket. It is called from {{getOzoneFileStatus}} from
{{KeyManagerImpl#getFileStatus}}. This was added in HDDS-7253.
h2. Discovery
However, due to RockDB [prefix seek using a bloom
filter|https://github.com/facebook/rocksdb/wiki/Prefix-Seek], leading to
{{keyValue}} [returning
non-null|https://github.com/apache/ozone/blob/106b193c2ae9e111ba273b1f9dcb1c1a6e9057cb/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java#L1184-L1188]
even if such volume+bucket+key prefix doesn't exist at all at times, it
appears that the current prefix check logic in {{createFakeDirIfShould}} is not
sufficient in verification.
This is discovered by [~hemantk] while debugging HDDS-7861, a snapshot test,
while the issue itself does not appear to be related to snapshot code additions.
h2. Potential Solution
Check volume and bucket names as well inside {{if (keyValue != null)}}
cc [~hemantk]
cc [~XiChen]] [~ckj] [~duongnguyen] that authored/reviewed patch HDDS-7253
cc [~erose] the OBS/FSO bucket expert
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