Struct mz_storage::storage_state::SinkHandle

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pub struct SinkHandle { /* private fields */ }
Expand description

This maintains an additional read hold on the source data for a sink, alongside the controller’s hold and the handle used to read the shard internally. This is useful because environmentd’s hold might expire, and the handle we use to read advances ahead of what we’ve successfully committed. In theory this could be stored alongside the other sink data, but this isn’t intended to be a long term solution; either this should become a “critical” handle or environmentd will learn to hold its handles across restarts and this won’t be needed.

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impl SinkHandle

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pub fn new( sink_id: GlobalId, from_metadata: &CollectionMetadata, shard_id: ShardId, initial_since: Antichain<Timestamp>, persist_clients: Arc<PersistClientCache> ) -> SinkHandle

A new handle.

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pub fn downgrade_since(&self, to: Antichain<Timestamp>)

Request a downgrade of the since. This should be called regularly; the internal task will debounce.

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