DAOS-18889 object: client retry conditional ops for DER_TX_RESTART case - b28#18273
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DAOS-18889 object: client retry conditional ops for DER_TX_RESTART case - b28#18273Nasf-Fan wants to merge 1 commit into
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…se - b28 On DTX non-leader, the order of two conditional modifications against the same object shard is uncontrolled. If the one with newer epoch is handled before the older one, then related ilog logic may regard them as potential conflict, then return -DER_TX_RESTART to the caller when handle the old one. Under such case, directly restart related DTX (on DTX leader) with newer epoch may still generate conflict, because hlc epsilon boundary covers relative large range of epoch. Then let's ask client to retry the operation with random delay that will much reduce the possibility of subsequent epoch conflict. Signed-off-by: Fan Yong <fan.yong@hpe.com>
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Ticket title is 'Random timeouts on IOR file creation causing slowdowns' |
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Test stage Functional Hardware Medium MD on SSD completed with status FAILURE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net//job/daos-stack/job/daos/view/change-requests/job/PR-18273/2/execution/node/1325/log |
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osa_online_drain failed for DAOS-18218, to be retested. |
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On DTX non-leader, the order of two conditional modifications against the same object shard is uncontrolled. If the one with newer epoch is handled before the older one, then related ilog logic may regard them as potential conflict, then return -DER_TX_RESTART to the caller when handle the old one. Under such case, directly restart related DTX (on DTX leader) with newer epoch may still generate conflict, because hlc epsilon boundary covers relative large range of epoch. Then let's ask client to retry the operation with random delay that will much reduce the possibility of subsequent epoch conflict.
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