The following statistics are gathered by the Cassandra key/value store implementation included with Rhino:

Global

Cassandra key/value store transaction and batching statistics

OID: not specified

Name Short Name Mapping Description Type Unit Label Default View Source Units Default Display Units

batchesCreated

batches

2

Cassandra BATCH statements created

counter

#

counter

batchedStatements

bStmts

3

UPDATE/DELETE statements included in a BATCH

counter

#

counter

batchedStatementSizeTotal

bStmtSzT

4

Total size of all UPDATE/DELETE statements that were batched

counter

bytes

counter

notBatchedStatements

XbStmts

5

UPDATE/DELETE statements not included in a BATCH

counter

#

counter

notBatchedStatementSizeTotal

XbStmtSzT

6

Total size of all UPDATE/DELETE statements that were not batched

counter

bytes

counter

querySuccesses

succ

7

Database queries that executed successfully

counter

#

counter

queryFailures

fail

8

Database queries that failed during execution

counter

#

counter

transactionsCommitted

txComm

10

Transactions committed to the key/value store

counter

#

counter

transactionsPersisted

txPers

11

Committed transactions persisted to the backend database(s)

counter

#

counter

transactionsDiscarded

txDisc

12

Committed transactions discarded due to pending state scan failure

counter

#

counter

pendingSize

size

13

Volume of state maintained by the key/value store awaiting persistence

counter

bytes

gauge

transactionsRejected

txRej

17

Transactions whose state could not be stored by the key/value store due to overload or the pending size limit being reached

counter

#

counter

batchedStatementSize

bStmtSz

Size of UPDATE/DELETE statements that were batched

sample

bytes

count

count

notBatchedStatementSize

XbStmtSz

Size of UPDATE/DELETE statements that were not batched

sample

bytes

count

count

persistTime

txPersT

Time taken to persist each set of transactions selected for persistence

sample

ms

time/nanoseconds

time/milliseconds

persistedBatchSize

persSz

Total size of all UPDATE/DELETE statements batched in each persistence cycle

sample

bytes

count

count

readTime

readT

Time taken to execute each SELECT statement

sample

ms

time/nanoseconds

time/milliseconds

scanTime

txScanT

Time taken to scan and collate a set of transactions that are eligible for persisting

sample

ms

time/nanoseconds

time/milliseconds

threadWaitTime

tWait

Time spent idle by a thread before it received scan/write work to perform

sample

ms

time/nanoseconds

time/milliseconds

writeTime

writeT

Time taken to execute (potentially batched) UPDATE/DELETE statements

sample

ms

time/nanoseconds

time/milliseconds

Table

Cassandra key/value store statistics for a single Cassandra table

OID: not specified

Name Short Name Mapping Description Type Unit Label Default View Source Units Default Display Units

commits

comm

2

Commits made against the table

counter

#

counter

keysUpdated

kUp

3

Individual key updates committed to the table

counter

#

counter

keyUpdatesPending

kPend

4

Individual key updates that have not yet been persisted or discarded

counter

#

gauge

keyUpdatesPersisted

kPers

5

Individual key updates that have been persisted to the backend database(s)

counter

#

counter

keyUpdatesDiscarded

kDisc

6

Individual key updates that have been discarded, eg. a later update was persisted instead, persistence of the key has been disabled, or overload occurred

counter

#

counter

retrievesAttempted

rAtt

7

Backend database retrieves attempted

counter

#

counter

retrievesSucceeded

rSucc

8

Backend database retrieves that returned useful data

counter

#

counter

retrievesFailed

rFail

9

Backend database retrieves that returned no data

counter

#

counter

updates

updt

10

UPDATE statements executed against the backend database(s)

counter

#

counter

updateSizeTotal

updtSzT

11

Total size of UPDATE statements executed against the backend database(s)

counter

bytes

counter

removes

remv

12

REMOVE statements executed against the backend database(s)

counter

#

counter

pendingSize

size

13

Volume of state maintained by the key/value store for this table awaiting persistence

counter

bytes

gauge

failedRetrieveTime

rFailT

Elapsed time for failed database retrieves

sample

ms

time/milliseconds

time/milliseconds

successfulRetrieveTime

rSuccT

Elapsed time for successful database retrieves

sample

ms

time/milliseconds

time/milliseconds

updateSize

updtSz

Size of UPDATE statements executed

sample

bytes

count

count

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Rhino Version 2.7.0