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由 Gang Xiong 提交于
1. move TMGXACT to PGPROC. 2. create distributed snapshot and create checkpoint will traverse procArray and acquire ProcArrayLock. shmControlLock is only used for serialize recoverTM(). 3. get rid of shmGxactArray and maintain an array of TMGXACT_LOG for recovery. Author: Gang Xiong <gxiong@pivotal.io> Author: Asim R P <apraveen@pivotal.io> Author: Ashwin Agrawal <aagrawal@pivotal.io>
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