apache/superset · error · TemporaryCacheGetFailedError

An error occurred while accessing the value.

Error message

An error occurred while accessing the value.

What it means

TemporaryCacheGetFailedError is raised by the explore form_data get command when reading or refreshing the cached state raises SQLAlchemyError — the except wraps the cache get, check_access, and the optional re-set for timeout refresh, then logs 'Error running get command' and re-raises this wrapper.

Source

Thrown at superset/commands/explore/form_data/get.py:60

    def run(self) -> Optional[str]:
        try:
            key = self._cmd_params.key
            state: TemporaryExploreState = cache_manager.explore_form_data_cache.get(
                key
            )
            if state:
                check_access(
                    state["datasource_id"],
                    state["chart_id"],
                    DatasourceType(state["datasource_type"]),
                )
                if self._refresh_timeout:
                    cache_manager.explore_form_data_cache.set(key, state)
                return state["form_data"]
            return None
        except SQLAlchemyError as ex:
            logger.exception("Error running get command")
            raise TemporaryCacheGetFailedError() from ex

    def validate(self) -> None:
        pass

View on GitHub (pinned to f4587218dd)

Solutions

1. Inspect the server log for the 'Error running get command' traceback to get the underlying SQLAlchemyError.
2. Check metadata DB health and Superset's DB connection pool metrics; restart workers if connections are poisoned.
3. Retry the URL after recovery — the cache entry, if intact, will still be there until its timeout lapses.
4. Longer term: configure pool_recycle/pool_pre_ping and monitor DB connection counts.

try:
    GetTemporaryExploreStateCommand(...).run()
except TemporaryCacheGetFailedError:
    if metadata_db_healthy():
        reload_with_retry()
    else:
        show_maintenance_notice()

When it happens

Trigger: Opening an Explore URL with a cached form_data key (GET) while the metadata database errors — unreachable, mid-failover, or with an exhausted connection pool.

Common situations: Dashboard/Explore links failing during DB maintenance windows. Load spikes exhausting the pool so the session/cache-adjacent queries fail. Stale connections after a DB restart behind an unchanged pool config.

Related errors

• An error occurred while creating the value.
• An error occurred while deleting the value.
• You don't have permission to modify the value.
• Invalid connection string, a valid string usually follows: b
• Unsupported cache backend configuration

AI-assisted analysis of apache/superset@f4587218dd (2026-08-14). Data as JSON: /api/errors/bb232923fe15aadc. Report an issue: GitHub.