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* update presentations * CLICKHOUSE-2936: redirect from clickhouse.yandex.ru and clickhouse.yandex.com * update submodule * lost files * CLICKHOUSE-2981: prefer sphinx docs over original reference * CLICKHOUSE-2981: docs styles more similar to main website + add flags to switch language links * update presentations * Less confusing directory structure (docs -> doc/reference/) * Minify sphinx docs too * Website release script: fail fast + pass docker hash on deploy * Do not underline links in docs * shorter * cleanup docker images * tune nginx config * CLICKHOUSE-3043: get rid of habrastorage links * Lost translation * CLICKHOUSE-2936: temporary client-side redirect * behaves weird in test * put redirect back * CLICKHOUSE-3047: copy docs txts to public too * move to proper file * remove old pages to avoid confusion * Remove reference redirect warning for now * Refresh README.md * Yellow buttons in docs * Use svg flags instead of unicode ones in docs * fix test website instance * Put flags to separate files * wrong flag * Copy Yandex.Metrica introduction from main page to docs * Yet another home page structure change, couple new blocks (CLICKHOUSE-3045) * Update Contacts section * CLICKHOUSE-2849: more detailed legal information * CLICKHOUSE-2978 preparation - split by files * More changes in Contacts block * Tune texts on index page * update presentations * One more benchmark * Add usage sections to index page, adapted from slides * Get the roadmap started, based on slides from last ClickHouse Meetup * CLICKHOUSE-2977: some rendering tuning * Get rid of excessive section in the end of getting started * Make headers linkable * CLICKHOUSE-2981: links to editing reference - https://github.com/yandex/ClickHouse/issues/849 * CLICKHOUSE-2981: fix mobile styles in docs * Ban crawling of duplicating docs * Open some external links in new tab * Ban old docs too * Lots of trivial fixes in english docs * Lots of trivial fixes in russian docs * Remove getting started copies in markdown * Add Yandex.Webmaster * Fix some sphinx warnings * More warnings fixed in english docs * More sphinx warnings fixed * Add code-block:: text * More code-block:: text * These headers look not that well * Better switch between documentation languages * merge use_case.rst into ya_metrika_task.rst * Edit the agg_functions.rst texts * Add lost empty lines * Lost blank lines * Add new logo sizes * update presentations * Next step in migrating to new documentation * Fix all warnings in en reference * Fix all warnings in ru reference * Re-arrange existing reference * Move operation tips to main reference * Fix typos noticed by milovidov@ * Get rid of zookeeper.md * Looks like duplicate of tutorial.html * Fix some mess with html tags in tutorial * No idea why nobody noticed this before, but it was completely not clear whet to get the data * Match code block styling between main and tutorial pages (in favor of the latter) * Get rid of some copypaste in tutorial * Normalize header styles * Move example_datasets to sphinx * Move presentations submodule to website * Move and update README.md * No point in duplicating articles from habrahabr here * Move development-related docs as is for now * doc/reference/ -> docs/ (to match the URL on website) * Adapt links to match the previous commit * Adapt development docs to rst (still lacks translation and strikethrough support) * clean on release * blacklist presentations in gulp * strikethrough support in sphinx * just copy development folder for now * fix weird introduction in style article * Style guide translation (WIP) * Finish style guide translation to English * gulp clean separately * Update year in LICENSE * Initial CONTRIBUTING.md * Fix remaining links to old docs in tutorial * Some tutorial fixes * Typo * Another typo * Update list of authors from yandex-team accoding to git log
74 lines
3.1 KiB
ReStructuredText
74 lines
3.1 KiB
ReStructuredText
system.zookeeper
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----------------
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Позволяет читать данные из ZooKeeper кластера, описанного в конфигурации.
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В запросе обязательно в секции WHERE должно присутствовать условие на равенство path - путь в ZooKeeper, для детей которого вы хотите получить данные.
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Запрос ``SELECT * FROM system.zookeeper WHERE path = '/clickhouse'`` выведет данные по всем детям узла ``/clickhouse``.
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Чтобы вывести данные по всем узлам в корне, напишите path = '/'.
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Если узла, указанного в path не существует, то будет брошено исключение.
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Столбцы:
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.. code-block:: text
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name String - имя узла
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path String - путь к узлу
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value String - значение узла
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dataLength Int32 - размер значения
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numChildren Int32 - количество детей
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czxid Int64 - идентификатор транзакции, в которой узел был создан
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mzxid Int64 - идентификатор транзакции, в которой узел был последний раз изменён
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pzxid Int64 - идентификатор транзакции, последний раз удаливший или добавивший детей
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ctime DateTime - время создания узла
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mtime DateTime - время последней модификации узла
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version Int32 - версия узла - количество раз, когда узел был изменён
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cversion Int32 - количество добавлений или удалений детей
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aversion Int32 - количество изменений ACL
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ephemeralOwner Int64 - для эфемерных узлов - идентификатор сессии, которая владеет этим узлом
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Пример:
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.. code-block:: sql
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SELECT *
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FROM system.zookeeper
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WHERE path = '/clickhouse/tables/01-08/visits/replicas'
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FORMAT Vertical
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.. code-block:: text
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Row 1:
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──────
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name: example01-08-1.yandex.ru
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value:
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czxid: 932998691229
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mzxid: 932998691229
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ctime: 2015-03-27 16:49:51
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mtime: 2015-03-27 16:49:51
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version: 0
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cversion: 47
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aversion: 0
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ephemeralOwner: 0
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dataLength: 0
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numChildren: 7
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pzxid: 987021031383
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path: /clickhouse/tables/01-08/visits/replicas
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Row 2:
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──────
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name: example01-08-2.yandex.ru
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value:
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czxid: 933002738135
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mzxid: 933002738135
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ctime: 2015-03-27 16:57:01
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mtime: 2015-03-27 16:57:01
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version: 0
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cversion: 37
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aversion: 0
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ephemeralOwner: 0
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dataLength: 0
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numChildren: 7
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pzxid: 987021252247
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path: /clickhouse/tables/01-08/visits/replicas
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