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PrimaryTxObserver::prepare used to block pending responses from each backup. With
concurrent transactions this can deadlock the broker: once all worker threads
are blocked in prepare, responses from backups cannot be received.
This commit generalizes the async completion mechanism for messages to allow
async completion of arbitrary commands. It leaves the special-case code for
messages undisturbed but adds a second path (starting from
SessionState::handleCommand) for async completion of other commands.
In particular it implements tx.commit to allow async completion.
TxBuffer is now an AsyncCompletion and commitLocal() is split into
- startCommit() called by SemanticState::commit()
- endCommit() called when the commit command completes
TxAccept no longer holds pre-computed ranges, compute fresh each time.
- Avoid range iterators going out of date during a delayed commit.
git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1536754 13f79535-47bb-0310-9956-ffa450edef68
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Switched from shared_ptr to intrusive_ptr for TxBuffer and DtxBuffer.
git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1536752 13f79535-47bb-0310-9956-ffa450edef68
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git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1510596 13f79535-47bb-0310-9956-ffa450edef68
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git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1509861 13f79535-47bb-0310-9956-ffa450edef68
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On primary a PrimaryTxObserver observes a transaction's TxBuffer and generates
transaction events on a tx-replication-queue. On the backup a TxReplicator
receives the events and constructs a TxBuffer equivalent to the one in the
primary.
Unfinished:
- Primary does not wait for backups to prepare() before committing.
- All connected backups are assumed to be in the transaction, there are race
conditions around brokers joining/leavinv where this assumption is invalid.
- Need more tests.
git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1509423 13f79535-47bb-0310-9956-ffa450edef68
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Added TransactionObserver interface, called at each point in a transaction's
lifecycle. Currently only a single observer can be associated with a
transaction.
Added startTx, startDtx to BrokerObserver so plugins can observe transactions
starting and set a TransactionObserver.
git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1509421 13f79535-47bb-0310-9956-ffa450edef68
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