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In order to increase availability in a distributed system some or all of the data items are replicated and stored at separate sites. This is an issue of key concern especially since there is such a proliferation of wireless technologies and mobile users. However, the concurrent processing of transactions at separa
sites can g
enerate inconsistencies in the stored information. We have built a distributed service that
manages updates to widely deployed counter
like replicas. There are many heavy
systems targeting large information critical applications. Our sys
tem is intentionally, relatively light -
weight and useful for the somewhat reduced information critical applications. The service is built on our distributed concurrency control scheme which combines optimism and pessimism in the processing of
The service allows a transaction to be processed immediately (optimistically) at any
individual replica as long as the transaction satisfies a cost bound. All transactions are also proc
essed in a
concurrent pessimistic manner to ensure mutual consistency.