ZooKeeperServer (Apache ZooKeeper

java.lang.Object
- org.apache.zookeeper.server.ZooKeeperServer

All Implemented Interfaces:

ServerStats.Provider, SessionTracker.SessionExpirer

Direct Known Subclasses:

QuorumZooKeeperServer, ReadOnlyZooKeeperServer
```
public class ZooKeeperServer
extends Object
implements SessionTracker.SessionExpirer, ServerStats.Provider
```
This class implements a simple standalone ZooKeeperServer. It sets up the following chain of RequestProcessors to process requests: PrepRequestProcessor -> SyncRequestProcessor -> FinalRequestProcessor

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class ZooKeeperServer.MissingSessionException

protected static class ZooKeeperServer.State

Nested Classes
Modifier and Type	Class and Description
`static class`	`ZooKeeperServer.MissingSessionException`
`protected static class`	`ZooKeeperServer.State`

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`ALLOW_SASL_FAILED_CLIENTS`
`static String`	`CLOSE_SESSION_TXN_ENABLED`
`static int`	`DEFAULT_STARTING_BUFFER_SIZE`
`static int`	`DEFAULT_THROTTLED_OP_WAIT_TIME`
`static int`	`DEFAULT_TICK_TIME`
`static String`	`ENABLE_EAGER_ACL_CHECK`
`static String`	`ENFORCE_QUOTA`
`static boolean`	`enforceQuota`
`protected RequestProcessor`	`firstProcessor`
`static String`	`GET_CHILDREN_RESPONSE_CACHE_SIZE`
`static String`	`GET_DATA_RESPONSE_CACHE_SIZE`
`static String`	`GLOBAL_OUTSTANDING_LIMIT`
`protected String`	`initialConfig`
`static String`	`INT_BUFFER_STARTING_SIZE_BYTES` Starting size of read and write ByteArroyOuputBuffers.
`static int`	`intBufferStartingSizeBytes`
`protected DataTreeBean`	`jmxDataTreeBean`
`protected ZooKeeperServerBean`	`jmxServerBean`
`protected JvmPauseMonitor`	`jvmPauseMonitor`
`protected int`	`listenBacklog` Socket listen backlog.
`protected static org.slf4j.Logger`	`LOG`
`protected int`	`maxSessionTimeout` value of -1 indicates unset, use default
`protected int`	`minSessionTimeout` value of -1 indicates unset, use default
`static Exception`	`ok`
`protected boolean`	`reconfigEnabled`
`static String`	`SASL_SUPER_USER`
`protected ServerCnxnFactory`	`secureServerCnxnFactory`
`protected ServerCnxnFactory`	`serverCnxnFactory`
`protected SessionTracker`	`sessionTracker`
`static String`	`SKIP_ACL`
`static String`	`SNAP_COUNT`
`protected ZooKeeperServer.State`	`state`
`protected static int`	`throttledOpWaitTime`
`protected int`	`tickTime`
`static String`	`ZOOKEEPER_DIGEST_ENABLED`

Constructor Summary

Constructors
Constructor and Description
`ZooKeeperServer()` Creates a ZooKeeperServer instance.
`ZooKeeperServer(File snapDir, File logDir, int tickTime)` This constructor is for backward compatibility with the existing unit test code.
`ZooKeeperServer(FileTxnSnapLog txnLogFactory)` Default constructor, relies on the config for its argument values
`ZooKeeperServer(FileTxnSnapLog txnLogFactory, int tickTime, int minSessionTimeout, int maxSessionTimeout, int clientPortListenBacklog, ZKDatabase zkDb, String initialConfig)` Keeping this constructor for backward compatibility
`ZooKeeperServer(FileTxnSnapLog txnLogFactory, int tickTime, int minSessionTimeout, int maxSessionTimeout, int clientPortListenBacklog, ZKDatabase zkDb, String initialConfig, boolean reconfigEnabled)` * Creates a ZooKeeperServer instance.
`ZooKeeperServer(FileTxnSnapLog txnLogFactory, int tickTime, String initialConfig)` creates a zookeeperserver instance.
`ZooKeeperServer(JvmPauseMonitor jvmPauseMonitor, FileTxnSnapLog txnLogFactory, int tickTime, int minSessionTimeout, int maxSessionTimeout, int clientPortListenBacklog, ZKDatabase zkDb, String initialConfig)` Adds JvmPauseMonitor and calls `ZooKeeperServer(FileTxnSnapLog, int, int, int, int, ZKDatabase, String)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`authWriteRequest(Request request)` Check Write Requests for Potential Access Restrictions Before a request is being proposed to the quorum, lets check it against local ACLs.
`protected boolean`	`canShutdown()` This can be used while shutting down the server to see whether the server is already shutdown or not.
`void`	`checkACL(ServerCnxn cnxn, List<ACL> acl, int perm, List<Id> ids, String path, List<ACL> setAcls)` Grant or deny authorization to an operation on a node as a function of:
`protected boolean`	`checkPasswd(long sessionId, byte[] passwd)`
`void`	`checkQuota(String path, byte[] lastData, byte[] data, int type)` check a path whether exceeded the quota.
`boolean`	`checkRequestSizeWhenReceivingMessage(int length)`
`void`	`closeSession(long sessionId)`
`void`	`closeSession(ServerCnxn cnxn, RequestHeader requestHeader)`
`BlueThrottle`	`connThrottle()`
`protected void`	`createSessionTracker()`
`void`	`decInProcess()`
`void`	`dumpConf(PrintWriter pwriter)`
`void`	`dumpEphemerals(PrintWriter pwriter)`
`void`	`dumpMonitorValues(BiConsumer<String,Object> response)` Hook into admin server, useful to expose additional data that do not represent metrics.
`void`	`enqueueRequest(Request si)`
`void`	`expire(long sessionId)`
`void`	`expire(SessionTracker.Session session)`
`void`	`finishSessionInit(ServerCnxn cnxn, boolean valid)`
`int`	`getClientPort()`
`int`	`getClientPortListenBacklog()`
`ZooKeeperServerConf`	`getConf()`
`double`	`getConnectionDropChance()`
`long`	`getDataDirSize()`
`Map<Long,Set<String>>`	`getEphemerals()`
`ResponseCache`	`getGetChildrenResponseCache()`
`int`	`getGlobalOutstandingLimit()`
`int`	`getInflight()`
`String`	`getInitialConfig()`
`int`	`getInProcess()`
`int`	`getLargeRequestBytes()`
`int`	`getLargeRequestMaxBytes()`
`int`	`getLargeRequestThreshold()`
`long`	`getLastProcessedZxid()` return the last processed id from the datatree
`long`	`getLogDirSize()`
`int`	`getMaxClientCnxnsPerHost()` Maximum number of connections allowed from particular host (ip)
`int`	`getMaxSessionTimeout()`
`int`	`getMinSessionTimeout()`
`int`	`getNumAliveConnections()` return the total number of client connections that are alive to this server
`int`	`getOutstandingHandshakeNum()`
`long`	`getOutstandingRequests()` return the outstanding requests in the queue, which haven't been processed yet
`ResponseCache`	`getReadResponseCache()`
`RequestPathMetricsCollector`	`getRequestPathMetricsCollector()`
`int`	`getSecureClientPort()`
`ServerCnxnFactory`	`getSecureServerCnxnFactory()`
`ServerCnxnFactory`	`getServerCnxnFactory()`
`long`	`getServerId()`
`Map<Long,Set<Long>>`	`getSessionExpiryMap()`
`SessionTracker`	`getSessionTracker()`
`static int`	`getSnapCount()`
`static long`	`getSnapSizeInBytes()`
`String`	`getState()`
`static int`	`getThrottledOpWaitTime()`
`int`	`getTickTime()`
`long`	`getTxnLogElapsedSyncTime()` Returns the elapsed sync of time of transaction log in milliseconds.
`FileTxnSnapLog`	`getTxnLogFactory()`
`ZKDatabase`	`getZKDatabase()` get the zookeeper database for this server
`ZooKeeperServerShutdownHandler`	`getZkShutdownHandler()`
`ZooKeeperServerListener`	`getZooKeeperServerListener()`
`long`	`getZxid()`
`void`	`incInProcess()`
`static boolean`	`isCloseSessionTxnEnabled()`
`static boolean`	`isDigestEnabled()`
`boolean`	`isReconfigEnabled()`
`boolean`	`isResponseCachingEnabled()`
`boolean`	`isRunning()`
`protected void`	`killSession(long sessionId, long zxid)`
`void`	`loadData()` Restore sessions and data
`void`	`processConnectRequest(ServerCnxn cnxn, ByteBuffer incomingBuffer)`
`void`	`processPacket(ServerCnxn cnxn, ByteBuffer incomingBuffer)`
`DataTree.ProcessTxnResult`	`processTxn(Request request)`
`DataTree.ProcessTxnResult`	`processTxn(TxnHeader hdr, Record txn)`
`protected void`	`registerJMX()`
`protected void`	`registerMetrics()`
`void`	`reopenSession(ServerCnxn cnxn, long sessionId, byte[] passwd, int sessionTimeout)`
`void`	`requestFinished(Request request)`
`protected void`	`revalidateSession(ServerCnxn cnxn, long sessionId, int sessionTimeout)`
`ServerStats`	`serverStats()`
`void`	`setClientPortListenBacklog(int backlog)`
`static void`	`setCloseSessionTxnEnabled(boolean enabled)`
`void`	`setCreateSessionTrackerServerId(int newId)` Change the server ID used by `createSessionTracker()`.
`static void`	`setDigestEnabled(boolean digestEnabled)`
`void`	`setLargeRequestMaxBytes(int bytes)`
`void`	`setLargeRequestThreshold(int threshold)`
`protected void`	`setLocalSessionFlag(Request si)` If the underlying Zookeeper server support local session, this method will set a isLocalSession to true if a request is associated with a local session.
`void`	`setMaxSessionTimeout(int max)`
`void`	`setMinSessionTimeout(int min)`
`void`	`setOwner(long id, Object owner)` set the owner of this session as owner
`void`	`setResponseCachingEnabled(boolean isEnabled)`
`void`	`setSecureServerCnxnFactory(ServerCnxnFactory factory)`
`void`	`setServerCnxnFactory(ServerCnxnFactory factory)`
`protected void`	`setState(ZooKeeperServer.State state)` Sets the state of ZooKeeper server.
`static void`	`setThrottledOpWaitTime(int time)`
`void`	`setTickTime(int tickTime)`
`void`	`setTxnLogFactory(FileTxnSnapLog txnLog)`
`protected void`	`setupRequestProcessors()`
`void`	`setZKDatabase(ZKDatabase zkDb)` set the zkdatabase for this zookeeper server
`void`	`setZxid(long zxid)`
`boolean`	`shouldForceWriteInitialSnapshotAfterLeaderElection()`
`boolean`	`shouldThrottle(long outStandingCount)`
`void`	`shutdown()`
`void`	`shutdown(boolean fullyShutDown)` Shut down the server instance
`void`	`startdata()`
`protected void`	`startJvmPauseMonitor()`
`protected void`	`startRequestThrottler()`
`void`	`startServing()`
`protected void`	`startSessionTracker()`
`void`	`startup()`
`void`	`startupWithoutServing()`
`void`	`submitRequest(Request si)`
`void`	`submitRequestNow(Request si)`
`void`	`takeSnapshot()`
`void`	`takeSnapshot(boolean syncSnap)`
`void`	`truncateLog(long zxid)` truncate the log to get in sync with others if in a quorum
`protected void`	`unregisterJMX()`
`protected void`	`unregisterMetrics()`
`protected void`	`validateSession(ServerCnxn cnxn, long sessionId)` Validate if a particular session can be reestablished.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

protected static final org.slf4j.Logger LOG

GLOBAL_OUTSTANDING_LIMIT

public static final String GLOBAL_OUTSTANDING_LIMIT

See Also:: Constant Field Values

ENABLE_EAGER_ACL_CHECK

public static final String ENABLE_EAGER_ACL_CHECK

See Also:: Constant Field Values

SKIP_ACL
```
public static final String SKIP_ACL
```
See Also:

Constant Field Values

ENFORCE_QUOTA

public static final String ENFORCE_QUOTA

See Also:: Constant Field Values

enforceQuota

public static final boolean enforceQuota

SASL_SUPER_USER

public static final String SASL_SUPER_USER

See Also:: Constant Field Values

ALLOW_SASL_FAILED_CLIENTS

public static final String ALLOW_SASL_FAILED_CLIENTS

See Also:: Constant Field Values

ZOOKEEPER_DIGEST_ENABLED

public static final String ZOOKEEPER_DIGEST_ENABLED

See Also:: Constant Field Values

CLOSE_SESSION_TXN_ENABLED

public static final String CLOSE_SESSION_TXN_ENABLED

See Also:: Constant Field Values

jmxServerBean

protected ZooKeeperServerBean jmxServerBean

jmxDataTreeBean
```
protected DataTreeBean jmxDataTreeBean
```

DEFAULT_TICK_TIME
```
public static final int DEFAULT_TICK_TIME
```
See Also:

Constant Field Values

tickTime
```
protected int tickTime
```

DEFAULT_THROTTLED_OP_WAIT_TIME
```
public static final int DEFAULT_THROTTLED_OP_WAIT_TIME
```
See Also:

Constant Field Values

throttledOpWaitTime

protected static volatile int throttledOpWaitTime

minSessionTimeout
```
protected int minSessionTimeout
```
value of -1 indicates unset, use default

maxSessionTimeout
```
protected int maxSessionTimeout
```
value of -1 indicates unset, use default

listenBacklog
```
protected int listenBacklog
```
Socket listen backlog. Value of -1 indicates unset

sessionTracker

protected SessionTracker sessionTracker

ok
```
public static final Exception ok
```

firstProcessor

protected RequestProcessor firstProcessor

jvmPauseMonitor

protected JvmPauseMonitor jvmPauseMonitor

state

protected volatile ZooKeeperServer.State state

initialConfig
```
protected String initialConfig
```

reconfigEnabled
```
protected boolean reconfigEnabled
```

serverCnxnFactory

protected ServerCnxnFactory serverCnxnFactory

secureServerCnxnFactory

protected ServerCnxnFactory secureServerCnxnFactory

INT_BUFFER_STARTING_SIZE_BYTES
```
public static final String INT_BUFFER_STARTING_SIZE_BYTES
```
Starting size of read and write ByteArroyOuputBuffers. Default is 32 bytes. Flag not used for small transfers like connectResponses.

See Also:

Constant Field Values

DEFAULT_STARTING_BUFFER_SIZE
```
public static final int DEFAULT_STARTING_BUFFER_SIZE
```
See Also:

Constant Field Values

intBufferStartingSizeBytes

public static final int intBufferStartingSizeBytes

GET_DATA_RESPONSE_CACHE_SIZE

public static final String GET_DATA_RESPONSE_CACHE_SIZE

See Also:: Constant Field Values

GET_CHILDREN_RESPONSE_CACHE_SIZE

public static final String GET_CHILDREN_RESPONSE_CACHE_SIZE

See Also:: Constant Field Values

SNAP_COUNT
```
public static final String SNAP_COUNT
```
See Also:

Constant Field Values

Constructor Detail

ZooKeeperServer
```
public ZooKeeperServer()
```
Creates a ZooKeeperServer instance. Nothing is setup, use the setX methods to prepare the instance (eg datadir, datalogdir, ticktime, builder, etc...)

ZooKeeperServer

public ZooKeeperServer(FileTxnSnapLog txnLogFactory,
                       int tickTime,
                       int minSessionTimeout,
                       int maxSessionTimeout,
                       int clientPortListenBacklog,
                       ZKDatabase zkDb,
                       String initialConfig)

Keeping this constructor for backward compatibility

ZooKeeperServer

public ZooKeeperServer(FileTxnSnapLog txnLogFactory,
                       int tickTime,
                       int minSessionTimeout,
                       int maxSessionTimeout,
                       int clientPortListenBacklog,
                       ZKDatabase zkDb,
                       String initialConfig,
                       boolean reconfigEnabled)

* Creates a ZooKeeperServer instance. It sets everything up, but doesn't actually start listening for clients until run() is invoked.

ZooKeeperServer

public ZooKeeperServer(JvmPauseMonitor jvmPauseMonitor,
                       FileTxnSnapLog txnLogFactory,
                       int tickTime,
                       int minSessionTimeout,
                       int maxSessionTimeout,
                       int clientPortListenBacklog,
                       ZKDatabase zkDb,
                       String initialConfig)

Adds JvmPauseMonitor and calls ZooKeeperServer(FileTxnSnapLog, int, int, int, int, ZKDatabase, String)

ZooKeeperServer
```
public ZooKeeperServer(FileTxnSnapLog txnLogFactory,
                       int tickTime,
                       String initialConfig)
```
creates a zookeeperserver instance.

Parameters:

txnLogFactory - the file transaction snapshot logging class

tickTime - the ticktime for the server

Throws:

IOException

ZooKeeperServer

public ZooKeeperServer(File snapDir,
                       File logDir,
                       int tickTime)
                throws IOException

This constructor is for backward compatibility with the existing unit test code. It defaults to FileLogProvider persistence provider.

Throws:: IOException

ZooKeeperServer
```
public ZooKeeperServer(FileTxnSnapLog txnLogFactory)
                throws IOException
```
Default constructor, relies on the config for its argument values

Throws:

IOException

Method Detail

isCloseSessionTxnEnabled

public static boolean isCloseSessionTxnEnabled()

setCloseSessionTxnEnabled

public static void setCloseSessionTxnEnabled(boolean enabled)

getInitialConfig
```
public String getInitialConfig()
```

serverStats
```
public ServerStats serverStats()
```

getRequestPathMetricsCollector

public RequestPathMetricsCollector getRequestPathMetricsCollector()

connThrottle
```
public BlueThrottle connThrottle()
```

dumpConf

public void dumpConf(PrintWriter pwriter)

getConf
```
public ZooKeeperServerConf getConf()
```

getZKDatabase
```
public ZKDatabase getZKDatabase()
```
get the zookeeper database for this server

Returns:

the zookeeper database for this server

setZKDatabase
```
public void setZKDatabase(ZKDatabase zkDb)
```
set the zkdatabase for this zookeeper server

Parameters:

zkDb -

loadData

public void loadData()
              throws IOException,
                     InterruptedException

Restore sessions and data

Throws:: IOException; InterruptedException

takeSnapshot
```
public void takeSnapshot()
```

takeSnapshot

public void takeSnapshot(boolean syncSnap)

shouldForceWriteInitialSnapshotAfterLeaderElection

public boolean shouldForceWriteInitialSnapshotAfterLeaderElection()

getDataDirSize
```
public long getDataDirSize()
```
Specified by:

getDataDirSize in interface ServerStats.Provider

getLogDirSize
```
public long getLogDirSize()
```
Specified by:

getLogDirSize in interface ServerStats.Provider

getZxid
```
public long getZxid()
```

getSessionTracker

public SessionTracker getSessionTracker()

setZxid
```
public void setZxid(long zxid)
```

closeSession

public void closeSession(long sessionId)

killSession

protected void killSession(long sessionId,
                           long zxid)

expire
```
public void expire(SessionTracker.Session session)
```
Specified by:

expire in interface SessionTracker.SessionExpirer

expire
```
public void expire(long sessionId)
```

registerJMX
```
protected void registerJMX()
```

startdata

public void startdata()
               throws IOException,
                      InterruptedException

Throws:: IOException; InterruptedException

startup
```
public void startup()
```

startupWithoutServing
```
public void startupWithoutServing()
```

startServing
```
public void startServing()
```

startJvmPauseMonitor
```
protected void startJvmPauseMonitor()
```

startRequestThrottler

protected void startRequestThrottler()

setupRequestProcessors

protected void setupRequestProcessors()

getZooKeeperServerListener

public ZooKeeperServerListener getZooKeeperServerListener()

setCreateSessionTrackerServerId
```
public void setCreateSessionTrackerServerId(int newId)
```
Change the server ID used by createSessionTracker(). Must be called prior to startup() being called

Parameters:

newId - ID to use

createSessionTracker
```
protected void createSessionTracker()
```

startSessionTracker
```
protected void startSessionTracker()
```

setState
```
protected void setState(ZooKeeperServer.State state)
```
Sets the state of ZooKeeper server. After changing the state, it notifies the server state change to a registered shutdown handler, if any.
The following are the server state transitions:
- During startup the server will be in the INITIAL state.
- After successfully starting, the server sets the state to RUNNING.
- The server transitions to the ERROR state if it hits an internal error. ZooKeeperServerListenerImpl notifies any critical resource error events, e.g., SyncRequestProcessor not being able to write a txn to disk.
- During shutdown the server sets the state to SHUTDOWN, which corresponds to the server not running.
Parameters:

state - new server state.

canShutdown
```
protected boolean canShutdown()
```
This can be used while shutting down the server to see whether the server is already shutdown or not.

Returns:

true if the server is running or server hits an error, false otherwise.

isRunning
```
public boolean isRunning()
```
Returns:

true if the server is running, false otherwise.

shutdown
```
public void shutdown()
```

shutdown
```
public void shutdown(boolean fullyShutDown)
```
Shut down the server instance

Parameters:

fullyShutDown - true if another server using the same database will not replace this one in the same process

unregisterJMX
```
protected void unregisterJMX()
```

incInProcess
```
public void incInProcess()
```

decInProcess
```
public void decInProcess()
```

getInProcess
```
public int getInProcess()
```

getInflight
```
public int getInflight()
```

checkPasswd

protected boolean checkPasswd(long sessionId,
                              byte[] passwd)

setOwner

public void setOwner(long id,
                     Object owner)
              throws KeeperException.SessionExpiredException

set the owner of this session as owner

Parameters:: id - the session id; owner - the owner of the session
Throws:: KeeperException.SessionExpiredException

revalidateSession

protected void revalidateSession(ServerCnxn cnxn,
                                 long sessionId,
                                 int sessionTimeout)
                          throws IOException

Throws:: IOException

reopenSession

public void reopenSession(ServerCnxn cnxn,
                          long sessionId,
                          byte[] passwd,
                          int sessionTimeout)
                   throws IOException

Throws:: IOException

finishSessionInit

public void finishSessionInit(ServerCnxn cnxn,
                              boolean valid)

closeSession

public void closeSession(ServerCnxn cnxn,
                         RequestHeader requestHeader)

getServerId
```
public long getServerId()
```
Specified by:

getServerId in interface SessionTracker.SessionExpirer

setLocalSessionFlag
```
protected void setLocalSessionFlag(Request si)
```
If the underlying Zookeeper server support local session, this method will set a isLocalSession to true if a request is associated with a local session.

Parameters:

si -

submitRequest

public void submitRequest(Request si)

enqueueRequest

public void enqueueRequest(Request si)

submitRequestNow

public void submitRequestNow(Request si)

getSnapCount
```
public static int getSnapCount()
```

getGlobalOutstandingLimit

public int getGlobalOutstandingLimit()

getSnapSizeInBytes

public static long getSnapSizeInBytes()

setServerCnxnFactory

public void setServerCnxnFactory(ServerCnxnFactory factory)

getServerCnxnFactory

public ServerCnxnFactory getServerCnxnFactory()

getSecureServerCnxnFactory

public ServerCnxnFactory getSecureServerCnxnFactory()

setSecureServerCnxnFactory

public void setSecureServerCnxnFactory(ServerCnxnFactory factory)

getLastProcessedZxid
```
public long getLastProcessedZxid()
```
return the last processed id from the datatree

Specified by:

getLastProcessedZxid in interface ServerStats.Provider

getOutstandingRequests
```
public long getOutstandingRequests()
```
return the outstanding requests in the queue, which haven't been processed yet

Specified by:

getOutstandingRequests in interface ServerStats.Provider

getNumAliveConnections
```
public int getNumAliveConnections()
```
return the total number of client connections that are alive to this server

Specified by:

getNumAliveConnections in interface ServerStats.Provider

truncateLog
```
public void truncateLog(long zxid)
                 throws IOException
```
truncate the log to get in sync with others if in a quorum

Parameters:

zxid - the zxid that it needs to get in sync with others

Throws:

IOException

getTickTime
```
public int getTickTime()
```

setTickTime

public void setTickTime(int tickTime)

getThrottledOpWaitTime

public static int getThrottledOpWaitTime()

setThrottledOpWaitTime

public static void setThrottledOpWaitTime(int time)

getMinSessionTimeout
```
public int getMinSessionTimeout()
```

setMinSessionTimeout

public void setMinSessionTimeout(int min)

getMaxSessionTimeout
```
public int getMaxSessionTimeout()
```

setMaxSessionTimeout

public void setMaxSessionTimeout(int max)

getClientPortListenBacklog

public int getClientPortListenBacklog()

setClientPortListenBacklog

public void setClientPortListenBacklog(int backlog)

getClientPort
```
public int getClientPort()
```

getSecureClientPort
```
public int getSecureClientPort()
```

getMaxClientCnxnsPerHost
```
public int getMaxClientCnxnsPerHost()
```
Maximum number of connections allowed from particular host (ip)

setTxnLogFactory

public void setTxnLogFactory(FileTxnSnapLog txnLog)

getTxnLogFactory

public FileTxnSnapLog getTxnLogFactory()

getTxnLogElapsedSyncTime
```
public long getTxnLogElapsedSyncTime()
```
Returns the elapsed sync of time of transaction log in milliseconds.

getState
```
public String getState()
```
Specified by:

getState in interface ServerStats.Provider

dumpEphemerals

public void dumpEphemerals(PrintWriter pwriter)

getEphemerals

public Map<Long,Set<String>> getEphemerals()

getConnectionDropChance

public double getConnectionDropChance()

processConnectRequest

public void processConnectRequest(ServerCnxn cnxn,
                                  ByteBuffer incomingBuffer)
                           throws IOException,
                                  ClientCnxnLimitException

Throws:: IOException; ClientCnxnLimitException

validateSession

protected void validateSession(ServerCnxn cnxn,
                               long sessionId)
                        throws IOException

Validate if a particular session can be reestablished.

Parameters:: cnxn -; sessionId -
Throws:: IOException

shouldThrottle

public boolean shouldThrottle(long outStandingCount)

getLargeRequestMaxBytes
```
public int getLargeRequestMaxBytes()
```

setLargeRequestMaxBytes

public void setLargeRequestMaxBytes(int bytes)

getLargeRequestThreshold
```
public int getLargeRequestThreshold()
```

setLargeRequestThreshold

public void setLargeRequestThreshold(int threshold)

getLargeRequestBytes
```
public int getLargeRequestBytes()
```

checkRequestSizeWhenReceivingMessage

public boolean checkRequestSizeWhenReceivingMessage(int length)
                                             throws IOException

Throws:: IOException

requestFinished

public void requestFinished(Request request)

processPacket

public void processPacket(ServerCnxn cnxn,
                          ByteBuffer incomingBuffer)
                   throws IOException

Throws:: IOException

processTxn

public DataTree.ProcessTxnResult processTxn(TxnHeader hdr,
                                            Record txn)

processTxn

public DataTree.ProcessTxnResult processTxn(Request request)

getSessionExpiryMap

public Map<Long,Set<Long>> getSessionExpiryMap()

isResponseCachingEnabled

public boolean isResponseCachingEnabled()

setResponseCachingEnabled

public void setResponseCachingEnabled(boolean isEnabled)

getReadResponseCache

public ResponseCache getReadResponseCache()

getGetChildrenResponseCache

public ResponseCache getGetChildrenResponseCache()

registerMetrics
```
protected void registerMetrics()
```

unregisterMetrics
```
protected void unregisterMetrics()
```

dumpMonitorValues
```
public void dumpMonitorValues(BiConsumer<String,Object> response)
```
Hook into admin server, useful to expose additional data that do not represent metrics.

Parameters:

response - a sink which collects the data.

checkACL
```
public void checkACL(ServerCnxn cnxn,
                     List<ACL> acl,
                     int perm,
                     List<Id> ids,
                     String path,
                     List<ACL> setAcls)
              throws KeeperException.NoAuthException
```
Grant or deny authorization to an operation on a node as a function of:

Parameters:

cnxn - : the server connection

acl - : set of ACLs for the node

perm - : the permission that the client is requesting

ids - : the credentials supplied by the client

path - : the ZNode path

setAcls - : for set ACL operations, the list of ACLs being set. Otherwise null.

Throws:

KeeperException.NoAuthException

checkQuota
```
public void checkQuota(String path,
                       byte[] lastData,
                       byte[] data,
                       int type)
                throws KeeperException.QuotaExceededException
```
check a path whether exceeded the quota.

Parameters:

path - the path of the node, used for the quota prefix check

lastData - the current node data, null for none

data - the data to be set, or null for none

type - currently, create and setData need to check quota

Throws:

KeeperException.QuotaExceededException

isDigestEnabled

public static boolean isDigestEnabled()

setDigestEnabled

public static void setDigestEnabled(boolean digestEnabled)

authWriteRequest
```
public boolean authWriteRequest(Request request)
```
Check Write Requests for Potential Access Restrictions
Before a request is being proposed to the quorum, lets check it against local ACLs. Non-write requests (read, session, etc.) are passed along. Invalid requests are sent a response.
While we are at it, if the request will set an ACL: make sure it's a valid one.

Parameters:

request -

Returns:

true if request is permitted, false if not.

Throws:

IOException

getOutstandingHandshakeNum

public int getOutstandingHandshakeNum()

isReconfigEnabled
```
public boolean isReconfigEnabled()
```

getZkShutdownHandler

public ZooKeeperServerShutdownHandler getZkShutdownHandler()

Class ZooKeeperServer

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LOG

GLOBAL_OUTSTANDING_LIMIT

ENABLE_EAGER_ACL_CHECK

SKIP_ACL

ENFORCE_QUOTA

enforceQuota

SASL_SUPER_USER

ALLOW_SASL_FAILED_CLIENTS

ZOOKEEPER_DIGEST_ENABLED

CLOSE_SESSION_TXN_ENABLED

jmxServerBean

jmxDataTreeBean

DEFAULT_TICK_TIME

tickTime

DEFAULT_THROTTLED_OP_WAIT_TIME

throttledOpWaitTime

minSessionTimeout

maxSessionTimeout

listenBacklog

sessionTracker

ok

firstProcessor

jvmPauseMonitor

state

initialConfig

reconfigEnabled

serverCnxnFactory

secureServerCnxnFactory

INT_BUFFER_STARTING_SIZE_BYTES

DEFAULT_STARTING_BUFFER_SIZE

intBufferStartingSizeBytes

GET_DATA_RESPONSE_CACHE_SIZE

GET_CHILDREN_RESPONSE_CACHE_SIZE

SNAP_COUNT

Constructor Detail

ZooKeeperServer

ZooKeeperServer

ZooKeeperServer

ZooKeeperServer

ZooKeeperServer

ZooKeeperServer

ZooKeeperServer

Method Detail

isCloseSessionTxnEnabled

setCloseSessionTxnEnabled

getInitialConfig

serverStats

getRequestPathMetricsCollector

connThrottle

dumpConf

getConf

getZKDatabase

setZKDatabase

loadData

takeSnapshot

takeSnapshot

shouldForceWriteInitialSnapshotAfterLeaderElection

getDataDirSize

getLogDirSize

getZxid

getSessionTracker

setZxid

closeSession

killSession

expire

expire

registerJMX

startdata

startup

startupWithoutServing

startServing

startJvmPauseMonitor

startRequestThrottler