Ex­tremeTrans­ac­tions 3.9.8

123322: Avoid log­ging over­head for (root) trans­ac­tions with only one par­tic­i­pant

Trans­ac­tions with only 1 par­tic­i­pant (or re­source) will re­sort to 1-phase com­mit and there is no way to re­cov­er their state. There­fore, log­ging adds use­less over­head and is now avoid­ed.

123291: Un­ex­pect­ed XAEx­cep­tion er­rorCode dur­ing 2PC com­mit: call re­cov­er() to find out if retry makes sense

We now try to avoid un­nec­es­sary and an­noy­ing Heuris­ticHazard out­comes and dito re­tries, by do­ing ex­tra checks in the XARe­source back­end when­ev­er pos­si­ble.

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