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Synchronizer Troubleshooting

Sequencer subscriptions fail for newly onboarded sequencers

Newly onboarded Sequencers only serve events more recent than the “onboarding snapshot” taken during the onboarding. In addition, some events may belong to transactions initiated before a Sequencer was onboarded, but the Sequencer is not in a position to sign such events and replaces them with “tombstones”. If a participant (or mediator) connects to a newly onboarded Sequencer too soon and the subscription encounters a tombstone, the Sequencer subscription aborts with a FAILED_PRECONDITION error specifying InvalidCounter or SEQUENCER_TOMBSTONE_ENCOUNTERED. If this occurs, the participant or mediator should connect to another Sequencer with a longer history of sequenced events before switching to the newly onboarded Sequencer.