Troubleshooting
Problem
This technote provides information about a defect in IBM Rational ClearCase which may result in the loss of data when using the UTF type managers.
Symptom
In ClearCase version 7.1 new UTF type managers were introduced:
utf8_file_delta
utf16le_file_delta
utf16be_file_delta
utf32le_file_delta
utf32be_file_delta
A serious defect was identified with these type managers which can result in the loss of data.
The symptom of the problem is that cleartext for a file version gets generated incorrectly. It will have the incorrect size; in many cases it will have size zero (an empty file).
The problem occurs when the file element is being developed on multiple branches. The worst-case scenario is that a merge to a new branch stemming from /main/0 will result in loss of data for all previously existing versions. An example of this would be a UCM interproject delivery to a project which previously did not see the file.
Note that IBM Rational ClearCase does not provide built-in element types which utilize these type managers.
This will only affect clients which have created a custom element types (eltype).
The defect affects the management of the source containers, not the diff/merge tools.
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Document Information
Modified date:
23 June 2018
UID
swg21415461