Monitoring a Vertica replication scenario requires checking the status of both the Extractor - extracting data from MySQL - and the Applier which retrieves the remote THL information and applies it to Vertica.

shell> trepctl status
Processing status command...
NAME                     VALUE
----                     -----
appliedLastEventId     : mysql-bin.000012:0000000128889042;0
appliedLastSeqno       : 1070
appliedLatency         : 22.537
channels               : 1
clusterName            : alpha
currentEventId         : mysql-bin.000012:0000000128889042
currentTimeMillis      : 1378489888477
dataServerHost         : mysqldb01
extensions             :
latestEpochNumber      : 897
masterConnectUri       : thl://localhost:/
masterListenUri        : thl://mysqldb01:2112/
maximumStoredSeqNo     : 1070
minimumStoredSeqNo     : 0
offlineRequests        : NONE
pendingError           : NONE
pendingErrorCode       : NONE
pendingErrorEventId    : NONE
pendingErrorSeqno      : -1
pendingExceptionMessage: NONE
pipelineSource         : jdbc:mysql:thin://mysqldb01:13306/
relativeLatency        : 691980.477
resourcePrecedence     : 99
rmiPort                : 10000
role                   : master
seqnoType              : java.lang.Long
serviceName            : alpha
serviceType            : local
simpleServiceName      : alpha
siteName               : default
sourceId               : mysqldb01
state                  : ONLINE
timeInStateSeconds     : 694039.058
transitioningTo        :
uptimeSeconds          : 694041.81
useSSLConnection       : false
version                : Tungsten Replicator 7.1.4 build 10
Finished status command...

On the Applier, the output of trepctl shows the current sequence number and applier status:

shell> trepctl status
Processing status command...
NAME                     VALUE
----                     -----
appliedLastEventId     : mysql-bin.000012:0000000128889042;0
appliedLastSeqno       : 1070
appliedLatency         : 78.302
channels               : 1
clusterName            : default
currentEventId         : NONE
currentTimeMillis      : 1378479271609
dataServerHost         : vertica01
extensions             :
latestEpochNumber      : 897
masterConnectUri       : thl://mysqldb01:2112/
masterListenUri        : null
maximumStoredSeqNo     : 1070
minimumStoredSeqNo     : 0
offlineRequests        : NONE
pendingError           : NONE
pendingErrorCode       : NONE
pendingErrorEventId    : NONE
pendingErrorSeqno      : -1
pendingExceptionMessage: NONE
pipelineSource         : thl://mysqldb01:2112/
relativeLatency        : 681363.609
resourcePrecedence     : 99
rmiPort                : 10000
role                   : slave
seqnoType              : java.lang.Long
serviceName            : alpha
serviceType            : local
simpleServiceName      : alpha
siteName               : default
sourceId               : vertica01
state                  : ONLINE
timeInStateSeconds     : 681486.806
transitioningTo        :
uptimeSeconds          : 689922.693
useSSLConnection       : false
version                : Tungsten Replicator 7.1.4 build 10
Finished status command...

The appliedLastSeqno should match as normal. Because of the batching of transactions the appliedLatency may be much higher than a normal MySQL to MySQL replication.