Supratim Deka created HDDS-2682:
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Summary: OM File create request does not check for existing
directory with the same name
Key: HDDS-2682
URL: https://issues.apache.org/jira/browse/HDDS-2682
Project: Hadoop Distributed Data Store
Issue Type: Bug
Components: Ozone Manager
Reporter: Supratim Deka
Assignee: Supratim Deka
Assume the following sequence of operations/requests:
Req 1. create file -> /d1/d2/d3/d4/k1 (d3 implicitly is a sub-directory inside
/d1/d2)
Req 2. create file -> /d1/d2/d3 (d3 as a file inside /d1/d2)
When processing request 2, OMFileCreateRequest needs to check if 'd1/d2/d3' is
the name of an existing file or an existing directory. In which case the
request has to fail.
Currently for request 2, OM will check explicitly if there is a key '/d1/d2/d3'
in the key table.
Also for non-recursive create requests, OM will check if parent directory
/d1/d2 already exists. For this, the OM iterates the key table to check if
'd1/d2' occurs as a prefix of any key in the key table - checkKeysUnderPath()
What is missing in current behaviour?
For OM File create, the table iterator must also determine if '/d1/d2/d3'
exists as a prefix for any key in the key table - not just '/d1/d2'.
This fix is required for the correctness of OzoneFS namespace. There is a
potential performance impact - which is outside the scope of this jira and will
be addressed separately.
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