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Consistent and Efficient Recovery for Causal Message Logging
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Consistent and Efficient Recovery for Causal Message Logging
JinHo Ahn5 , Sung-Gi Min5 and ChongSun Hwang5 
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Dept. of CS & Eng., Korea University, 5-1 Anam-dong, Sungbuk-gu, Seoul, 136-701, Republic of Korea |
Abstract
To reduce the number of stable storage accesses and impose no restriction on the execution of live processes during recovery,
Elnozahy proposed a recovery algorithm based on causal message logging. However, the algorithm with independent checkpointing
may force the system to be in an inconsistent state when processes fail concurrently. In this paper, we identify these inconsistent
cases and then present a recovery algorithm to perform consistent recovery by allowing the recovery leader to collect recovery
information from the other recovering processes as well as all live ones. Our recovery algorithm requires no additional message
compared with Elnozahy’s algorithm.
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