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92 lines
4.6 KiB
Markdown
92 lines
4.6 KiB
Markdown
# system.replication_queue {#system_tables-replication_queue}
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包含用于 `ReplicatedMergeTree` 系列表的复制队列中存储在ZooKeeper中的任务的信息.
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列信息:
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- `database` ([String](../../sql-reference/data-types/string.md)) — 数据库名称.
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- `table` ([String](../../sql-reference/data-types/string.md)) — 表名称.
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- `replica_name` ([String](../../sql-reference/data-types/string.md)) — ZooKeeper中的副本名称. 同一张表的不同副本具有不同的名称.
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- `position` ([UInt32](../../sql-reference/data-types/int-uint.md)) — 任务在队列中的位置.
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- `node_name` ([String](../../sql-reference/data-types/string.md)) — ZooKeeper中的节点名称.
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- `type` ([String](../../sql-reference/data-types/string.md)) — 队列中任务的类型, 其中之一:
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- `GET_PART` — 从另一个副本获取分片.
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- `ATTACH_PART` — 附加的部分, 可能来自我们自己的副本(如果在 `detached` 文件夹中找到). 您可以将其视为具有一些优化的 `GET_PART` , 因为它们几乎相同.
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- `MERGE_PARTS` — 合并分片.
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- `DROP_RANGE` — 删除指定分区内指定编号范围内的分片.
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- `CLEAR_COLUMN` — 注意：已弃用. 从指定分区删除特定列.
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- `CLEAR_INDEX` — 注意：已弃用. 从指定分区删除特定索引.
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- `REPLACE_RANGE` — 丢弃一定范围的零件并用新零件替换它们.
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- `MUTATE_PART` — 对分片应用一个或多个突变.
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- `ALTER_METADATA` — 根据全局 /metadata 和 /columns 路径应用alter修改.
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- `create_time` ([Datetime](../../sql-reference/data-types/datetime.md)) — 提交任务执行的日期和时间.
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- `required_quorum` ([UInt32](../../sql-reference/data-types/int-uint.md)) — 等待任务完成并确认完成的副本数. 此列仅与 `GET_PARTS` 任务相关.
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- `source_replica` ([String](../../sql-reference/data-types/string.md)) — 源副本的名称.
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- `new_part_name` ([String](../../sql-reference/data-types/string.md)) — 新分片的名称.
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- `parts_to_merge` ([Array](../../sql-reference/data-types/array.md) ([String](../../sql-reference/data-types/string.md))) — 要合并或更新的分片名称.
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- `is_detach` ([UInt8](../../sql-reference/data-types/int-uint.md)) — 该标志指示 `DETACH_PARTS` 任务是否在队列中.
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- `is_currently_executing` ([UInt8](../../sql-reference/data-types/int-uint.md)) — 该标志指示当前是否正在执行特定任务.
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- `num_tries` ([UInt32](../../sql-reference/data-types/int-uint.md)) — 尝试完成任务失败的次数.
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- `last_exception` ([String](../../sql-reference/data-types/string.md)) — 发生的最后一个错误的短信（如果有）.
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- `last_attempt_time` ([Datetime](../../sql-reference/data-types/datetime.md)) — 上次尝试任务的日期和时间.
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- `num_postponed` ([UInt32](../../sql-reference/data-types/int-uint.md)) — 延期任务数.
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- `postpone_reason` ([String](../../sql-reference/data-types/string.md)) — 任务延期的原因.
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- `last_postpone_time` ([Datetime](../../sql-reference/data-types/datetime.md)) — 上次推迟任务的日期和时间.
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- `merge_type` ([String](../../sql-reference/data-types/string.md)) — 当前合并的类型. 如果是突变则为空.
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**示例**
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``` sql
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SELECT * FROM system.replication_queue LIMIT 1 FORMAT Vertical;
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```
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``` text
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Row 1:
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──────
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database: merge
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table: visits_v2
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replica_name: mtgiga001-1t.metrika.yandex.net
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position: 15
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node_name: queue-0009325559
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type: MERGE_PARTS
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create_time: 2020-12-07 14:04:21
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required_quorum: 0
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source_replica: mtgiga001-1t.metrika.yandex.net
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new_part_name: 20201130_121373_121384_2
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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']
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is_detach: 0
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is_currently_executing: 0
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num_tries: 36
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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 20.8.7.15 (official build))
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last_attempt_time: 2020-12-08 17:35:54
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num_postponed: 0
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postpone_reason:
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last_postpone_time: 1970-01-01 03:00:00
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```
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**另请参阅**
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- [管理 ReplicatedMergeTree 表](../../sql-reference/statements/system.md#query-language-system-replicated)
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[原始文章](https://clickhouse.com/docs/en/operations/system_tables/replication_queue) <!--hide-->
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