THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Furthermore, the state containing the persisted data of an input/output should also contain a small header. The header consists of a version number identifying the used checkpoint format. For the first version (described above), the number is ‘1’ and gives us the option for backward compatible changes. See Figure 4 for an overview over all involved headers. Note that the current buffer format including record header remains untouched and is just shown for completeness.
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Figure 2: The format of the state-based storage. The state header contains the version number and is written once per logical input / output.
Each buffer is prefixed with the channel id for restoring the original assignment to channels.
Enhancing the checkpoints of operators
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