ReadOnlyZooKeeperServer (ZooKeeper 3.4.13-6 API)

java.lang.Object
- org.apache.zookeeper.server.ZooKeeperServer
- - org.apache.zookeeper.server.quorum.QuorumZooKeeperServer
  - - org.apache.zookeeper.server.quorum.ReadOnlyZooKeeperServer

All Implemented Interfaces:

ServerStats.Provider, SessionTracker.SessionExpirer
```
public class ReadOnlyZooKeeperServer
extends QuorumZooKeeperServer
```
A ZooKeeperServer which comes into play when peer is partitioned from the majority. Handles read-only clients, but drops connections from not-read-only ones.
The very first processor in the chain of request processors is a ReadOnlyRequestProcessor which drops state-changing requests.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.zookeeper.server.ZooKeeperServer
  ZooKeeperServer.BasicDataTreeBuilder, ZooKeeperServer.DataTreeBuilder, ZooKeeperServer.MissingSessionException, ZooKeeperServer.State

Field Summary
- Fields inherited from class org.apache.zookeeper.server.quorum.QuorumZooKeeperServer
  self
- Fields inherited from class org.apache.zookeeper.server.ZooKeeperServer
  DEFAULT_TICK_TIME, firstProcessor, jmxDataTreeBean, jmxServerBean, LOG, maxSessionTimeout, minSessionTimeout, ok, sessionTracker, state, tickTime

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`long`	`getServerId()`	Returns the id of the associated QuorumPeer, which will do for a unique id of this server.
`java.lang.String`	`getState()`
`protected void`	`registerJMX()`
`void`	`registerJMX(ZooKeeperServerBean serverBean, LocalPeerBean localPeerBean)`
`protected void`	`setState(ZooKeeperServer.State state)`	Sets the state of ZooKeeper server.
`protected void`	`setupRequestProcessors()`
`void`	`shutdown()`
`void`	`startup()`
`protected void`	`unregisterJMX()`
`protected void`	`unregisterJMX(ZooKeeperServer zks)`

Methods inherited from class org.apache.zookeeper.server.quorum.QuorumZooKeeperServer
dumpConf

Methods inherited from class org.apache.zookeeper.server.ZooKeeperServer
canShutdown, checkPasswd, closeSession, closeSession, createSessionTracker, decInProcess, dumpEphemerals, expire, finishSessionInit, getClientPort, getGlobalOutstandingLimit, getInProcess, getLastProcessedZxid, getMaxSessionTimeout, getMinSessionTimeout, getNumAliveConnections, getOutstandingRequests, getServerCnxnFactory, getSnapCount, getTickTime, getTxnLogFactory, getZKDatabase, getZooKeeperServerListener, getZxid, incInProcess, isRunning, killSession, loadData, processConnectRequest, processPacket, processTxn, reopenSession, revalidateSession, serverStats, setMaxSessionTimeout, setMinSessionTimeout, setOwner, setServerCnxnFactory, setTickTime, setTxnLogFactory, setZKDatabase, setZxid, shouldThrottle, shutdown, startdata, startSessionTracker, submitRequest, takeSnapshot, truncateLog

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

- Method Detail
  - setupRequestProcessors
```
protected void setupRequestProcessors()
```
    Overrides:
    
    setupRequestProcessors in class ZooKeeperServer
  - startup
```
public void startup()
```
    Overrides:
    
    startup in class ZooKeeperServer
  - registerJMX
```
protected void registerJMX()
```
    Overrides:
    
    registerJMX in class ZooKeeperServer
  - registerJMX
```
public void registerJMX(ZooKeeperServerBean serverBean,
                        LocalPeerBean localPeerBean)
```
  - setState
```
protected void setState(ZooKeeperServer.State state)
```
    Description copied from class: ZooKeeperServer
    
    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.

Overrides:: setState in class QuorumZooKeeperServer
Parameters:: state - new server state.

unregisterJMX
```
protected void unregisterJMX()
```
Overrides:

unregisterJMX in class ZooKeeperServer

unregisterJMX

protected void unregisterJMX(ZooKeeperServer zks)

getState
```
public java.lang.String getState()
```
Specified by:

getState in interface ServerStats.Provider

Overrides:

getState in class ZooKeeperServer

getServerId
```
public long getServerId()
```
Returns the id of the associated QuorumPeer, which will do for a unique id of this server.

Specified by:

getServerId in interface SessionTracker.SessionExpirer

Overrides:

getServerId in class ZooKeeperServer

shutdown
```
public void shutdown()
```
Overrides:

shutdown in class ZooKeeperServer