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The Zookeeper class
(PECL zookeeper >= 0.1.0)
Introduction
Represents ZooKeeper session.
Class synopsis
$host
= ''
[, callable $watcher_cb
= NULL
[, int $recv_timeout
= 10000
]]] )$host
[, callable $watcher_cb
= NULL
[, int $recv_timeout
= 10000
]] ) : void$path
[, callable $watcher_cb
= NULL
[, array &$stat
= NULL
[, int $max_size
= 0
]]] ) : stringPredefined Constants
ZooKeeper Permissions
Zookeeper::PERM_READ
-
Can read nodes value and list its children
Zookeeper::PERM_WRITE
-
Can set the nodes value
Zookeeper::PERM_CREATE
-
Can create children
Zookeeper::PERM_DELETE
-
Can delete children
Zookeeper::PERM_ADMIN
-
Can execute set_acl()
Zookeeper::PERM_ALL
-
All of the above flags ORd together
ZooKeeper Create Flags
Zookeeper::EPHEMERAL
-
If Zookeeper::EPHEMERAL flag is set, the node will automatically get removed if the client session goes away.
Zookeeper::SEQUENCE
-
If the Zookeeper::SEQUENCE flag is set, a unique monotonically increasing sequence number is appended to the path name. The sequence number is always fixed length of 10 digits, 0 padded.
ZooKeeper Log Levels
Zookeeper::LOG_LEVEL_ERROR
-
Outputs only error mesages
Zookeeper::LOG_LEVEL_WARN
-
Outputs errors/warnings
Zookeeper::LOG_LEVEL_INFO
-
Outputs big action messages besides errors/warnings
Zookeeper::LOG_LEVEL_DEBUG
-
Outputs all
ZooKeeper States
Zookeeper::EXPIRED_SESSION_STATE
-
Connected but session expired
Zookeeper::AUTH_FAILED_STATE
-
Connected but auth failed
Zookeeper::CONNECTING_STATE
-
Connecting
Zookeeper::ASSOCIATING_STATE
-
Associating
Zookeeper::CONNECTED_STATE
-
Connected
Zookeeper::READONLY_STATE
-
TODO: help us improve this extension.
Zookeeper::NOTCONNECTED_STATE
-
Connection failed
ZooKeeper Watch Types
Zookeeper::CREATED_EVENT
-
A node has been created
This is only generated by watches on non-existent nodes. These watches are set using Zookeeper::exists.
Zookeeper::DELETED_EVENT
-
A node has been deleted
This is only generated by watches on nodes. These watches are set using Zookeeper::exists and Zookeeper::get.
Zookeeper::CHANGED_EVENT
-
A node has changed
This is only generated by watches on nodes. These watches are set using Zookeeper::exists and Zookeeper::get.
Zookeeper::CHILD_EVENT
-
A change as occurred in the list of children
This is only generated by watches on the child list of a node. These watches are set using Zookeeper::getChildren.
Zookeeper::SESSION_EVENT
-
A session has been lost
This is generated when a client loses contact or reconnects with a server.
Zookeeper::NOTWATCHING_EVENT
-
A watch has been removed
This is generated when the server for some reason, probably a resource constraint, will no longer watch a node for a client.
ZooKeeper System and Server-side Errors
Zookeeper::SYSTEMERROR
-
This is never thrown by the server, it shouldn't be used other than to indicate a range. Specifically error codes greater than this value, but lesser than Zookeeper::APIERROR, are system errors.
Zookeeper::RUNTIMEINCONSISTENCY
-
A runtime inconsistency was found.
Zookeeper::DATAINCONSISTENCY
-
A data inconsistency was found.
Zookeeper::CONNECTIONLOSS
-
Connection to the server has been lost.
Zookeeper::MARSHALLINGERROR
-
Error while marshalling or unmarshalling data.
Zookeeper::UNIMPLEMENTED
-
Operation is unimplemented.
Zookeeper::OPERATIONTIMEOUT
-
Operation timeout.
Zookeeper::BADARGUMENTS
-
Invalid arguments.
Zookeeper::INVALIDSTATE
-
Invliad zhandle state.
Zookeeper::NEWCONFIGNOQUORUM
-
No quorum of new config is connected and up-to-date with the leader of last committed config - try invoking reconfiguration after new servers are connected and synced.
Available as of ZooKeeper 3.5.0
Zookeeper::RECONFIGINPROGRESS
-
Reconfiguration requested while another reconfiguration is currently in progress. This is currently not supported. Please retry.
Available as of ZooKeeper 3.5.0
ZooKeeper API Errors
Zookeeper::OK
-
Everything is OK.
Zookeeper::APIERROR
-
This is never thrown by the server, it shouldn't be used other than to indicate a range. Specifically error codes greater than this value are API errors (while values less than this indicate a Zookeeper::SYSTEMERROR).
Zookeeper::NONODE
-
Node does not exist.
Zookeeper::NOAUTH
-
Not authenticated.
Zookeeper::BADVERSION
-
Version conflict.
Zookeeper::NOCHILDRENFOREPHEMERALS
-
Ephemeral nodes may not have children.
Zookeeper::NODEEXISTS
-
The node already exists.
Zookeeper::NOTEMPTY
-
The node has children.
Zookeeper::SESSIONEXPIRED
-
The session has been expired by the server.
Zookeeper::INVALIDCALLBACK
-
Invalid callback specified.
Zookeeper::INVALIDACL
-
Invalid ACL specified.
Zookeeper::AUTHFAILED
-
Client authentication failed.
Zookeeper::CLOSING
-
ZooKeeper is closing.
Zookeeper::NOTHING
-
(not error) No server responses to process.
Zookeeper::SESSIONMOVED
-
Session moved to another server, so operation is ignored.
Zookeeper::NOTREADONLY
-
State-changing request is passed to read-only server.
Zookeeper::EPHEMERALONLOCALSESSION
-
Attempt to create ephemeral node on a local session.
Zookeeper::NOWATCHER
-
The watcher couldn't be found.
Zookeeper::RECONFIGDISABLED
-
Attempts to perform a reconfiguration operation when reconfiguration feature is disabled.
Table of Contents
- Zookeeper::addAuth — Specify application credentials
- Zookeeper::close — Close the zookeeper handle and free up any resources
- Zookeeper::connect — Create a handle to used communicate with zookeeper
- Zookeeper::__construct — Create a handle to used communicate with zookeeper
- Zookeeper::create — Create a node synchronously
- Zookeeper::delete — Delete a node in zookeeper synchronously
- Zookeeper::exists — Checks the existence of a node in zookeeper synchronously
- Zookeeper::get — Gets the data associated with a node synchronously
- Zookeeper::getAcl — Gets the acl associated with a node synchronously
- Zookeeper::getChildren — Lists the children of a node synchronously
- Zookeeper::getClientId — Return the client session id, only valid if the connections is currently connected (ie. last watcher state is ZOO_CONNECTED_STATE)
- Zookeeper::getConfig — Get instance of ZookeeperConfig
- Zookeeper::getRecvTimeout — Return the timeout for this session, only valid if the connections is currently connected (ie. last watcher state is ZOO_CONNECTED_STATE). This value may change after a server re-connect
- Zookeeper::getState — Get the state of the zookeeper connection
- Zookeeper::isRecoverable — Checks if the current zookeeper connection state can be recovered
- Zookeeper::set — Sets the data associated with a node
- Zookeeper::setAcl — Sets the acl associated with a node synchronously
- Zookeeper::setDebugLevel — Sets the debugging level for the library
- Zookeeper::setDeterministicConnOrder — Enable/disable quorum endpoint order randomization
- Zookeeper::setLogStream — Sets the stream to be used by the library for logging
- Zookeeper::setWatcher — Set a watcher function
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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