PeriodicFailed

Event Re-added v133 → v150, v151 → current #6

Emitted when a periodic task fails to reschedule because the agenda is full.

View events on chain
Useful for: developersanalytics

The Big Picture

Error condition - a recurring task cannot continue because the target block is too full.

Use Cases

  • Debug recurring task failures
  • Monitor agenda capacity issues

From Chain Metadata

The given task was unable to be renewed since the agenda is full at that block.

Triggers

Preconditions

  • Periodic task completed
  • Next occurrence block agenda at capacity

Effects

Postconditions

  • Periodic task series terminated

Side Effects

  • Future occurrences will not happen

Event Data

#NameTypeDescription
0
task
(u32, u32) Task address as (block_number, index) tuple
1
id
Option Optional 32-byte task name (None for anonymous tasks)

Code Examples

import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";

const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });

// Subscribe to PeriodicFailed events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("Scheduler") &&
      event.method === "PeriodicFailed"
    )
    .forEach(({ event }) => {
      console.log("PeriodicFailed:", event.data.toHuman());
    });
});

Version History

v133 block 1,404,224 2 args
v151 block 3,157,274 2 args Current

Runtime Info

Pallet Index
15
Event Index
6
First Version
v133
Current Version
v393
Back to Scheduler Events