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, one of:
GET_PART— Get the part from another replica.
ATTACH_PART— Attach the part, possibly from our own replica (if found in the
detachedfolder). You may think of it as a
GET_PARTwith some optimizations as they're nearly identical.
MERGE_PARTS— Merge the parts.
DROP_RANGE— Delete the parts in the specified partition in the specified number range.
CLEAR_COLUMN— NOTE: Deprecated. Drop specific column from specified partition.
CLEAR_INDEX— NOTE: Deprecated. Drop specific index from specified partition.
REPLACE_RANGE— Drop a certain range of parts and replace them with new ones.
MUTATE_PART— Apply one or several mutations to the part.
ALTER_METADATA— Apply alter modification according to global /metadata and /columns paths.
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
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.
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' does not exist (version 184.108.40.206 (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
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