Techniques are provided for managing caches in a system with multiple
caches that may contain different copies of the same data item.
Specifically, techniques are provided for coordinating the write-to-disk
operations performed on such data items to ensure that older versions of
the data item are not written over newer versions, and to reduce the
amount of processing required to recover after a failure. Various
approaches are provided in which a master is used to coordinate with the
multiple caches to cause a data item to be written to persistent storage.
Techniques are also provided for managing checkpoints associated with the
caches, where the checkpoints are used to determine the position at which
to begin processing recovery logs in the event of a failure.