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 |
||
gcScans |
gcS |
15 |
Number of garbage collection scans this table has had |
counter |
# |
counter |
||
gcReaps |
gcR |
16 |
Number of keys that have been removed from this table during garbage collection scans |
counter |
# |
counter |
||
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 |
