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Merge pull request #28998 from otrazhenia/evgsudarikova-DOCSUP-13565-REPLICAS
DOCSUP-13565: Add new column last_queue_update_exception to system.replicas table
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tavplubix
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fc9a7593aa
@ -8,43 +8,48 @@ Example:
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``` sql
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SELECT *
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FROM system.replicas
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WHERE table = 'visits'
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WHERE table = 'test_table'
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FORMAT Vertical
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```
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``` text
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Query id: dc6dcbcb-dc28-4df9-ae27-4354f5b3b13e
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Row 1:
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──────
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database: merge
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table: visits
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engine: ReplicatedCollapsingMergeTree
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is_leader: 1
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can_become_leader: 1
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is_readonly: 0
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is_session_expired: 0
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future_parts: 1
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parts_to_check: 0
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zookeeper_path: /clickhouse/tables/01-06/visits
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replica_name: example01-06-1.yandex.ru
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replica_path: /clickhouse/tables/01-06/visits/replicas/example01-06-1.yandex.ru
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columns_version: 9
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queue_size: 1
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inserts_in_queue: 0
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merges_in_queue: 1
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part_mutations_in_queue: 0
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queue_oldest_time: 2020-02-20 08:34:30
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inserts_oldest_time: 1970-01-01 00:00:00
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merges_oldest_time: 2020-02-20 08:34:30
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part_mutations_oldest_time: 1970-01-01 00:00:00
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oldest_part_to_get:
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oldest_part_to_merge_to: 20200220_20284_20840_7
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oldest_part_to_mutate_to:
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log_max_index: 596273
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log_pointer: 596274
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last_queue_update: 2020-02-20 08:34:32
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absolute_delay: 0
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total_replicas: 2
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active_replicas: 2
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───────
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database: db
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table: test_table
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engine: ReplicatedMergeTree
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is_leader: 1
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can_become_leader: 1
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is_readonly: 0
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is_session_expired: 0
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future_parts: 0
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parts_to_check: 0
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zookeeper_path: /test/test_table
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replica_name: r1
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replica_path: /test/test_table/replicas/r1
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columns_version: -1
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queue_size: 27
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inserts_in_queue: 27
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merges_in_queue: 0
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part_mutations_in_queue: 0
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queue_oldest_time: 2021-10-12 14:48:48
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inserts_oldest_time: 2021-10-12 14:48:48
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merges_oldest_time: 1970-01-01 03:00:00
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part_mutations_oldest_time: 1970-01-01 03:00:00
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oldest_part_to_get: 1_17_17_0
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oldest_part_to_merge_to:
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oldest_part_to_mutate_to:
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log_max_index: 206
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log_pointer: 207
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last_queue_update: 2021-10-12 14:50:08
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absolute_delay: 99
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total_replicas: 5
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active_replicas: 5
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last_queue_update_exception:
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zookeeper_exception:
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replica_is_active: {'r1':1,'r2':1}
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```
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Columns:
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@ -82,6 +87,8 @@ The next 4 columns have a non-zero value only where there is an active session w
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- `absolute_delay` (`UInt64`) - How big lag in seconds the current replica has.
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- `total_replicas` (`UInt8`) - The total number of known replicas of this table.
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- `active_replicas` (`UInt8`) - The number of replicas of this table that have a session in ZooKeeper (i.e., the number of functioning replicas).
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- `last_queue_update_exception` (`String`) - When the queue contains broken entries. Especially important when ClickHouse breaks backward compatibility between versions and log entries written by newer versions aren't parseable by old versions.
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- `zookeeper_exception` (`String`) - The last exception message, got if the error happened when fetching the info from ZooKeeper.
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- `replica_is_active` ([Map(String, UInt8)](../../sql-reference/data-types/map.md)) — Map between replica name and is replica active.
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If you request all the columns, the table may work a bit slowly, since several reads from ZooKeeper are made for each row.
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@ -8,43 +8,48 @@
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``` sql
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SELECT *
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FROM system.replicas
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WHERE table = 'visits'
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WHERE table = 'test_table'
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FORMAT Vertical
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```
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``` text
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Query id: dc6dcbcb-dc28-4df9-ae27-4354f5b3b13e
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Row 1:
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──────
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database: merge
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table: visits
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engine: ReplicatedCollapsingMergeTree
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is_leader: 1
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can_become_leader: 1
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is_readonly: 0
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is_session_expired: 0
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future_parts: 1
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parts_to_check: 0
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zookeeper_path: /clickhouse/tables/01-06/visits
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replica_name: example01-06-1.yandex.ru
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replica_path: /clickhouse/tables/01-06/visits/replicas/example01-06-1.yandex.ru
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columns_version: 9
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queue_size: 1
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inserts_in_queue: 0
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merges_in_queue: 1
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part_mutations_in_queue: 0
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queue_oldest_time: 2020-02-20 08:34:30
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inserts_oldest_time: 0000-00-00 00:00:00
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merges_oldest_time: 2020-02-20 08:34:30
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part_mutations_oldest_time: 0000-00-00 00:00:00
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oldest_part_to_get:
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oldest_part_to_merge_to: 20200220_20284_20840_7
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oldest_part_to_mutate_to:
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log_max_index: 596273
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log_pointer: 596274
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last_queue_update: 2020-02-20 08:34:32
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absolute_delay: 0
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total_replicas: 2
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active_replicas: 2
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───────
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database: db
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table: test_table
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engine: ReplicatedMergeTree
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is_leader: 1
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can_become_leader: 1
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is_readonly: 0
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is_session_expired: 0
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future_parts: 0
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parts_to_check: 0
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zookeeper_path: /test/test_table
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replica_name: r1
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replica_path: /test/test_table/replicas/r1
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columns_version: -1
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queue_size: 27
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inserts_in_queue: 27
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merges_in_queue: 0
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part_mutations_in_queue: 0
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queue_oldest_time: 2021-10-12 14:48:48
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inserts_oldest_time: 2021-10-12 14:48:48
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merges_oldest_time: 1970-01-01 03:00:00
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part_mutations_oldest_time: 1970-01-01 03:00:00
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oldest_part_to_get: 1_17_17_0
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oldest_part_to_merge_to:
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oldest_part_to_mutate_to:
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log_max_index: 206
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log_pointer: 207
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last_queue_update: 2021-10-12 14:50:08
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absolute_delay: 99
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total_replicas: 5
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active_replicas: 5
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last_queue_update_exception:
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zookeeper_exception:
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replica_is_active: {'r1':1,'r2':1}
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```
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Столбцы:
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@ -82,6 +87,8 @@ active_replicas: 2
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- `absolute_delay` (`UInt64`) - задержка (в секундах) для текущей реплики.
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- `total_replicas` (`UInt8`) - общее число известных реплик этой таблицы.
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- `active_replicas` (`UInt8`) - число реплик этой таблицы, имеющих сессию в ZK; то есть, число работающих реплик.
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- `last_queue_update_exception` (`String`) - если в очереди есть битые записи. Особенно важно, когда в ClickHouse нарушается обратная совместимость между версиями, а записи журнала, сделанные более новыми версиями, не могут быть проанализированы старыми версиями.
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- `zookeeper_exception` (`String`) - последнее сообщение об исключении. Появляется, если ошибка произошла при получении информации из ZooKeeper.
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- `replica_is_active` ([Map(String, UInt8)](../../sql-reference/data-types/map.md)) — соответствие между именем реплики и признаком активности реплики.
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Если запрашивать все столбцы, то таблица может работать слегка медленно, так как на каждую строчку делается несколько чтений из ZK.
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