com.digitalasset.canton.domain.sequencing.sequencer
SequencerWriter
Companion object SequencerWriter
class SequencerWriter extends NamedLogging with FlagCloseableAsync
The Writer component is in practice a little state machine that will run crash recovery on startup then create a running SequencerWriterSource. If this materialized Sequencer flow then crashes with an exception that can be recovered by running crash recovery it will then go through this process and attempt to restart the flow.
Callers must call start to start the writer and will likely have to wait for this completing before accepting calls for the sequencer to direct at send. Note that the crash recovery steps may take a long duration to run:
- we delete invalid events previously written by the sequencer and then attempt to insert a new online watermark, and these database queries may simply take a long time to run.
- the SequencerWriter will wait until our clock has reached the new online watermark timestamp before starting the writer to ensure that no events before this timestamp are written. If this online watermark is significantly ahead of the current clock value it will just wait until this is reached. In practice assuming all sequencers in the local topology are kept in sync through NTP or similar, this duration should be very small (<1s).
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Instance Constructors
- new SequencerWriter(writerStoreFactory: SequencerWriterStoreFactory, createWriterFlow: (SequencerWriterStore, TraceContext) => RunningSequencerWriterFlow, storage: Storage, generalStore: SequencerStore, clock: Clock, expectedCommitMode: Option[CommitMode], timeouts: ProcessingTimeout, loggerFactory: NamedLoggerFactory)(implicit executionContext: ExecutionContext)
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Blocks until all earlier tasks have completed and then prevents further tasks from being run.
Blocks until all earlier tasks have completed and then prevents further tasks from being run.
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closeAsync asynchronously releases resources held by a future
closeAsync asynchronously releases resources held by a future
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an ordered sequence of async and sync closeables with async closeables made up of future and timeout
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- def closingTimeout: FiniteDuration
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Check whether we're closing.
Check whether we're closing. Susceptible to race conditions; unless you're using using this as a flag to the retry lib or you really know what you're doing, prefer performUnlessClosing and friends.
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track running futures on shutdown
track running futures on shutdown
set to true to get detailed information about all futures that did not complete during shutdown. if set to false, we don't do anything.
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- def logger: TracedLogger
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- val loggerFactory: NamedLoggerFactory
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Performs the task given by
funless a shutdown has been initiated.Performs the task given by
funless a shutdown has been initiated. The shutdown will only begin afterfcompletes, but other tasks may execute concurrently withf, if started using this function, or one of the other variants (performUnlessClosingF and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.- f
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Performs the EitherT[Future] given by
etfunless a shutdown has been initiated, in which case the provided error is returned instead.Performs the EitherT[Future] given by
etfunless a shutdown has been initiated, in which case the provided error is returned instead. Bothetfand the error are lazy;etfis only evaluated if there is no shutdown, the error only if we're shutting down. The shutdown will only begin afteretfcompletes, but other tasks may execute concurrently withetf, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingF). The tasks are assumed to take less than closingTimeout to complete.- etf
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Performs the Future given by
funless a shutdown has been initiated.Performs the Future given by
funless a shutdown has been initiated. The future is lazy and not evaluated during shutdown. The shutdown will only begin afterfcompletes, but other tasks may execute concurrently withf, if started using this function, or one of the other variants (performUnlessClosing and performUnlessClosingEitherT). The tasks are assumed to take less than closingTimeout to complete.- f
The task to perform
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The future completes with com.digitalasset.canton.lifecycle.UnlessShutdown.AbortedDueToShutdown if a shutdown has been initiated. Otherwise the result of the task wrapped in com.digitalasset.canton.lifecycle.UnlessShutdown.Outcome.
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- def runOnShutdown[T](task: RunOnShutdown)(implicit traceContext: TraceContext): Unit
Register a task that will run onClose after all "performUnlessShutdown" tasks have finished
Register a task that will run onClose after all "performUnlessShutdown" tasks have finished
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- def start()(implicit traceContext: TraceContext): EitherT[Future, WriterStartupError, Unit]
- def startOrLogError()(implicit traceContext: TraceContext): Future[Unit]
The startup of a SequencerWriter can fail at runtime.
The startup of a SequencerWriter can fail at runtime. Currently if this occurs we will log a message at error level but as we have no ability to forcibly crash the node we will likely continue running in an unhealthy state. This will however be visible to anyone calling the status operation and could be used by a process monitor to externally restart the sequencer.
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- val timeouts: ProcessingTimeout
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