rdhabalia opened a new pull request #9788:
URL: https://github.com/apache/pulsar/pull/9788
### Motivation
We frequently see consumer gets stuck and broker is not dispatching messages
though it should. We need additional pending-read metrics of the topic for
better debugging. eg: when subscription is stuck, we want to know `pendingRead`
and `pendingReplayRead` for better debugging.
for now, we have to validate from heapdump.
eg:
below example is stuck subscription which doesn't show subscription pending
read in metrics
stats
```
subscriptions" : {
"stuckSub" : {
"msgRateOut" : 0.0,
"msgThroughputOut" : 0.0,
"msgRateRedeliver" : 0.0,
"msgBacklog" : 3658305,
"blockedSubscriptionOnUnackedMsgs" : false,
"msgDelayed" : 0,
"unackedMessages" : 1341,
"type" : "Shared",
"msgRateExpired" : 1894,
"consumers" : [ {
"msgRateOut" : 0.0,
"msgThroughputOut" : 0.0,
"msgRateRedeliver" : 0.0,
"consumerName" : "c105b",
"availablePermits" : 915,
"unackedMessages" : 0,
"blockedConsumerOnUnackedMsgs" : false,
"metadata" : { },
"connectedSince" : "2021-01-24T17:58:57.134185Z",
"address" : "/1.1.1.1:4444"
}, {
```
stats-internal
```
"cursors" : {
"stuckSub" : {
"markDeletePosition" : "1111111:101782",
"readPosition" : "1111111:101783",
"waitingReadOp" : false,
"pendingReadOps" : 0,
"messagesConsumedCounter" : 168673209,
"cursorLedger" : 1111112,
"cursorLedgerLastEntry" : 61,
"individuallyDeletedMessages" : "[]",
"lastLedgerSwitchTimestamp" : "2021-01-25T13:39:44.82Z",
"state" : "Open",
"numberOfEntriesSinceFirstNotAckedMessage" : 1,
"totalNonContiguousDeletedMessagesRange" : 0,
"properties" : { }
}
```
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
