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WALSenderTimelineHistoryRead

Short Description

Waiting for a read from a timeline history file during walsender timeline command.

Additional Information

From the PostgreSQL documentation - Waiting for a read from a timeline history file during walsender timeline command.

The WalSender process is seen in systems where replication is enabled. The sender process takes the WAL transactions and send them so the replica where the WalReceiver process write the transactions to WAL segments.

Note that the WalSender process is started in response to a request from a replica, so there can be a number of WalSenders running depending on the number of replicas.

How to reduce this wait

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PostgreSQL docs - Wait Events of Type Activity

Percona Blog - Setting up Streaming Replication

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