David Ribeiro Alves has uploaded a new patch set (#2). Change subject: WIP: Make sure replica transactions start/abort on the consensus thread ......................................................................
WIP: Make sure replica transactions start/abort on the consensus thread In order for a replica to safely move "safe" time, it needs to know that all transactions that come before it have at least started. One way to do this is to call transaction_->Start() on transaction_driver_->Init() which we know is called by the consensus thread. This should be ok as the leader has already correctly serialized the transactions. However, if transactions are now started on Init() then, in the case they abort (i.e. when transaction_driver_->ReplicationFinished() is called with a non-ok status, again done on the consensus thread) we now must make sure that the transaction is actually removed from mvcc in-line. Otherwise the consensus thread might call Start() on another transaction with the same timestamp before the failed transaction is removed from mvcc. To do this, this patch add a latch to make sure that, if replication failed, the prepare phase has completed. Change-Id: Ie360e597eea86551c453717d7a1a000848027f4c --- M src/kudu/tablet/transactions/transaction_driver.cc M src/kudu/tablet/transactions/transaction_driver.h 2 files changed, 37 insertions(+), 6 deletions(-) git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/94/5294/2 -- To view, visit http://gerrit.cloudera.org:8080/5294 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newpatchset Gerrit-Change-Id: Ie360e597eea86551c453717d7a1a000848027f4c Gerrit-PatchSet: 2 Gerrit-Project: kudu Gerrit-Branch: master Gerrit-Owner: David Ribeiro Alves <dral...@apache.org> Gerrit-Reviewer: Kudu Jenkins
