String) — Name of the database.
table
(String) — Name of the table.
replica_name
(String) — Replica name in ZooKeeper. Different replicas of the same table have different names.
position
(UInt32) — Position of the task in the queue.
node_name
(String) — Node name in ZooKeeper.
type
(String) — Type of the task in the queue: GET_PARTS
, MERGE_PARTS
, DETACH_PARTS
, DROP_PARTS
, or MUTATE_PARTS
.
create_time
(Datetime) — Date and time when the task was submitted for execution.
required_quorum
(UInt32) — The number of replicas waiting for the task to complete with confirmation of completion. This column is only relevant for the GET_PARTS
task.
source_replica
(String) — Name of the source replica.
new_part_name
(String) — Name of the new part.
parts_to_merge
(Array (String)) — Names of parts to merge or update.
is_detach
(UInt8) — The flag indicates whether the DETACH_PARTS
task is in the queue.
is_currently_executing
(UInt8) — The flag indicates whether a specific task is being performed right now.
num_tries
(UInt32) — The number of failed attempts to complete the task.
last_exception
(String) — Text message about the last error that occurred (if any).
last_attempt_time
(Datetime) — Date and time when the task was last attempted.
num_postponed
(UInt32) — The number of postponed tasks.
postpone_reason
(String) — The reason why the task was postponed.
last_postpone_time
(Datetime) — Date and time when the task was last postponed.
merge_type
(String) — Type of the current merge. Empty if it's a mutation.
Example
SELECT * FROM system.replication_queue LIMIT 1 FORMAT Vertical;
Row 1:
──────
database: merge
table: visits_v2
replica_name: mtgiga001-1t.metrika.yandex.net
position: 15
node_name: queue-0009325559
type: MERGE_PARTS
create_time: 2020-12-07 14:04:21
required_quorum: 0
source_replica: mtgiga001-1t.metrika.yandex.net
new_part_name: 20201130_121373_121384_2
parts_to_merge: ['20201130_121373_121378_1','20201130_121379_121379_0','20201130_121380_121380_0','20201130_121381_121381_0','20201130_121382_121382_0','20201130_121383_121383_0','20201130_121384_121384_0']
is_detach: 0
is_currently_executing: 0
num_tries: 36
last_exception: Code: 226, e.displayText() = DB::Exception: Marks file '/opt/clickhouse/data/merge/visits_v2/tmp_fetch_20201130_121373_121384_2/CounterID.mrk' doesn't exist (version 20.8.7.15 (official build))
last_attempt_time: 2020-12-08 17:35:54
num_postponed: 0
postpone_reason:
last_postpone_time: 1970-01-01 03:00:00
See Also
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