me.prettyprint.cassandra.service
Class CassandraClientMonitor

java.lang.Object
  me.prettyprint.cassandra.service.CassandraClientMonitor

All Implemented Interfaces:

CassandraClientMonitorMBean

public class CassandraClientMonitor
extends Object
implements CassandraClientMonitorMBean

Nested Class Summary

static class

CassandraClientMonitor.Counter List of available JMX counts

Constructor Summary

CassandraClientMonitor(HConnectionManager connectionManager)

Method Summary

boolean	addCassandraHost(String hostStr) Add a host in the format of "[hostname]:[port]"
Set<String>	getExhaustedPoolNames() List of exhausted pools.
List<String>	getKnownHosts()
int	getNumActive() Total number of active clients in all client pools
int	getNumBlockedThreads() Number of threads that are currently blocked, waiting for a free connection.
long	getNumConnectionErrors() How many times did initial connection failed.
int	getNumExhaustedPools() Number of exhausted connection pools
int	getNumIdleConnections() Total number of idle clients in all client pools
long	getNumPoolExhaustedEventCount()
int	getNumPools() Number of existing connection pools.
long	getReadFail()
long	getReadSuccess()
long	getRecoverableErrorCount() Returns the total number of recoverable errors which is the sum of getRecoverableTimedOutCount, getRecoverableTimedOutCount and getRecoverableTransportExceptionCount
long	getRecoverableLoadBalancedConnectErrors()
long	getRecoverableTimedOutCount()
long	getRecoverableTransportExceptionCount()
long	getRecoverableUnavailableCount()
long	getSkipHostSuccess()
List<String>	getStatisticsPerPool() Retrieves stats per pool.
Set<String>	getSuspendedCassandraHosts()
long	getWriteFail()
long	getWriteSuccess()
void	incCounter(CassandraClientMonitor.Counter counterType)
boolean	removeCassandraHost(String hostStr) Remove a host in the format of "[hostname]:[port]"
boolean	suspendCassandraHost(String hostStr)
boolean	unsuspendCassandraHost(String hostStr)
void	updateKnownHosts() Tells all pulls to update their list of known hosts.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CassandraClientMonitor

public CassandraClientMonitor(HConnectionManager connectionManager)

Method Detail

incCounter

public void incCounter(CassandraClientMonitor.Counter counterType)

getWriteSuccess

public long getWriteSuccess()

getReadFail

public long getReadFail()

Specified by:

getReadFail in interface CassandraClientMonitorMBean

Returns:

Number of failed (and not recovered) reads.

getReadSuccess

public long getReadSuccess()

getSkipHostSuccess

public long getSkipHostSuccess()

Specified by:

getSkipHostSuccess in interface CassandraClientMonitorMBean

Returns:

Number of times a skip-host was performed. Hosts are skipped when there are errors at the current host.

getRecoverableTimedOutCount

public long getRecoverableTimedOutCount()

Specified by:

getRecoverableTimedOutCount in interface CassandraClientMonitorMBean

Returns:

Number of TimedOutException that the client has been able to recover from by failing over to a different host in the ring.

getRecoverableUnavailableCount

public long getRecoverableUnavailableCount()

Specified by:

getRecoverableUnavailableCount in interface CassandraClientMonitorMBean

Returns:

Number of UnavailableException that the client has been able to recover from by failing over to a different host in the ring.

getWriteFail

public long getWriteFail()

Specified by:

getWriteFail in interface CassandraClientMonitorMBean

Returns:

Number of failed (and not-recovered) writes.

updateKnownHosts

public void updateKnownHosts()
                      throws HectorTransportException

Description copied from interface: CassandraClientMonitorMBean

Tells all pulls to update their list of known hosts. This is useful when an admin adds/removes a host from the ring and wants the application to update asap.

Specified by:

updateKnownHosts in interface CassandraClientMonitorMBean

Throws:

HectorTransportException

getNumPoolExhaustedEventCount

public long getNumPoolExhaustedEventCount()

Specified by:

getNumPoolExhaustedEventCount in interface CassandraClientMonitorMBean

Returns:

Number of times clients were requested when connection pools were exhausted.

getExhaustedPoolNames

public Set<String> getExhaustedPoolNames()

Description copied from interface: CassandraClientMonitorMBean

List of exhausted pools.

Specified by:

getExhaustedPoolNames in interface CassandraClientMonitorMBean

Returns:

getNumActive

public int getNumActive()

Description copied from interface: CassandraClientMonitorMBean

Total number of active clients in all client pools

Specified by:

getNumActive in interface CassandraClientMonitorMBean

getNumBlockedThreads

public int getNumBlockedThreads()

Description copied from interface: CassandraClientMonitorMBean

Number of threads that are currently blocked, waiting for a free connection. This number may be greater than 0 only if the ExhaustedPolicy is ExhaustedPolicy.WHEN_EXHAUSTED_BLOCK

Specified by:

getNumBlockedThreads in interface CassandraClientMonitorMBean

getNumExhaustedPools

public int getNumExhaustedPools()

Description copied from interface: CassandraClientMonitorMBean

Number of exhausted connection pools

Specified by:

getNumExhaustedPools in interface CassandraClientMonitorMBean

Returns:

getNumIdleConnections

public int getNumIdleConnections()

Description copied from interface: CassandraClientMonitorMBean

Total number of idle clients in all client pools

Specified by:

getNumIdleConnections in interface CassandraClientMonitorMBean

getNumPools

public int getNumPools()

Description copied from interface: CassandraClientMonitorMBean

Number of existing connection pools. There may be up to one pool per cassandra host.

Specified by:

getNumPools in interface CassandraClientMonitorMBean

getKnownHosts

public List<String> getKnownHosts()

Specified by:

getKnownHosts in interface CassandraClientMonitorMBean

getStatisticsPerPool

public List<String> getStatisticsPerPool()

Description copied from interface: CassandraClientMonitorMBean

Retrieves stats per pool.

Specified by:

getStatisticsPerPool in interface CassandraClientMonitorMBean

getRecoverableTransportExceptionCount

public long getRecoverableTransportExceptionCount()

Specified by:

getRecoverableTransportExceptionCount in interface CassandraClientMonitorMBean

Returns:

Number of TTransportException that the client has been able to recover from by failing over to a different host in the ring.

getRecoverableErrorCount

public long getRecoverableErrorCount()

Description copied from interface: CassandraClientMonitorMBean

Returns the total number of recoverable errors which is the sum of getRecoverableTimedOutCount, getRecoverableTimedOutCount and getRecoverableTransportExceptionCount

Specified by:

getRecoverableErrorCount in interface CassandraClientMonitorMBean

Returns:

the total number of recoverable errors by failing over the other hosts.

getRecoverableLoadBalancedConnectErrors

public long getRecoverableLoadBalancedConnectErrors()

Specified by:

getRecoverableLoadBalancedConnectErrors in interface CassandraClientMonitorMBean

getNumConnectionErrors

public long getNumConnectionErrors()

Description copied from interface: CassandraClientMonitorMBean

How many times did initial connection failed.

Specified by:

getNumConnectionErrors in interface CassandraClientMonitorMBean

Returns:

addCassandraHost

public boolean addCassandraHost(String hostStr)

Description copied from interface: CassandraClientMonitorMBean

Add a host in the format of "[hostname]:[port]"

Specified by:

addCassandraHost in interface CassandraClientMonitorMBean

Returns:

removeCassandraHost

public boolean removeCassandraHost(String hostStr)

Description copied from interface: CassandraClientMonitorMBean

Remove a host in the format of "[hostname]:[port]"

Specified by:

removeCassandraHost in interface CassandraClientMonitorMBean

Returns:

See Also:

CassandraHost#equals(Object)} for how hosts are compared

getSuspendedCassandraHosts

public Set<String> getSuspendedCassandraHosts()

Specified by:

getSuspendedCassandraHosts in interface CassandraClientMonitorMBean

suspendCassandraHost

public boolean suspendCassandraHost(String hostStr)

Specified by:

suspendCassandraHost in interface CassandraClientMonitorMBean

Returns:

See Also:

#removeCassandraHost(String)} above for semantics of the host string., HConnectionManager#removeCassandraHost(CassandraHost)} for details of this operation.

unsuspendCassandraHost

public boolean unsuspendCassandraHost(String hostStr)

Specified by:

unsuspendCassandraHost in interface CassandraClientMonitorMBean

Returns:

See Also:

#suspendCassandraHost(String)} above. This is the opposite.