Broker LedgerHandle internal metadata is inconsistent with latest ledger metadata in zk after bookie recovery

[Shawyeok]

Describe the bug In our staging cluster, some bookie instances keep logging No ledger found while reading entry: xx from ledger: xxxx, I did some investigation and found the internal metadata of LedgerHandle(org.apache.bookkeeper.client.LedgerHandle#versionedMetadata) of specific ledgers are inconsistent with latest ledger metadata in zookeeper.

Screenshots Bookie logs: On that bookie, it says the readEntry request is from 172.30.10.3:48336 which is a broker instance.

[arthas@2278]$ watch org.apache.bookkeeper.proto.ReadEntryProcessorV3 getReadResponse {target.ledgerId,target.entryId,target.channel,returnObj.status} returnObj.status_!=0
Press Q or Ctrl+C to abort.
Affect(class count: 2 , method count: 1) cost in 225 ms, listenerId: 1
method=org.apache.bookkeeper.proto.ReadEntryProcessorV3.getReadResponse location=AtExit
ts=2022-01-10 14:07:30; [cost=1.716101ms] result=@ArrayList[
    @Long[4976503],
    @Long[0],
    @EpollSocketChannel[[id: 0xce78ecda, L:/172.30.10.2:3181 - R:/172.30.10.3:48336]],
    @StatusCode[ENOLEDGER],
]

On broker instance 172.30.10.3:8080, it says ensembles are 172.30.10.5:3181, 172.30.10.2:3181:

[arthas@2045]$ watch org.apache.bookkeeper.client.LedgerHandle asyncReadEntries {target.ledgerId,target.versionedMetadata} target.ledgerId==4976503
Press Q or Ctrl+C to abort.
Affect(class count: 3 , method count: 1) cost in 289 ms, listenerId: 2
method=org.apache.bookkeeper.client.LedgerHandle.asyncReadEntries location=AtExit
ts=2022-01-10 15:27:59; [cost=0.094076ms] result=@ArrayList[
    @Long[4976503],
    @Versioned[Versioned(value=LedgerMetadata{formatVersion=3, ensembleSize=2, writeQuorumSize=2, ackQuorumSize=2, state=CLOSED, length=300, lastEntryId=0, digestType=CRC32, password=base64:, ensembles={0=[172.30.10.5:3181, 172.30.10.2:3181]}, customMetadata={pulsar/compactedTopic=base64:cGVyc2lzdGVudDovL2NhbXB1cy9ic2l0ZS9fX2NoYW5nZV9ldmVudHMtcGFydGl0aW9uLTE=, component=base64:Y29tcGFjdGVkLWxlZGdlcg==, application=base64:cHVsc2Fy, pulsar/compactedTo=base64:CNnerwIQARgBMAA=}}, version=1)],
]

But the latest ledger metadata shows ensembles are 172.30.10.4:3181, 172.30.10.3:3181:

# curl -sS 'http://172.30.10.2:8000/api/v1/ledger/metadata?ledger_id=4976503'
{
  "4976503" : {
    "ledgerId" : 4976503,
    "metadataFormatVersion" : 3,
    "ensembleSize" : 2,
    "writeQuorumSize" : 2,
    "ackQuorumSize" : 2,
    "state" : "CLOSED",
    "length" : 300,
    "lastEntryId" : 0,
    "ctime" : 1640845770828,
    "digestType" : "CRC32",
    "password" : "",
    "customMetadata" : {
      "pulsar/compactedTopic" : "cGVyc2lzdGVudDovL2NhbXB1cy9ic2l0ZS9fX2NoYW5nZV9ldmVudHMtcGFydGl0aW9uLTE=",
      "component" : "Y29tcGFjdGVkLWxlZGdlcg==",
      "application" : "cHVsc2Fy",
      "pulsar/compactedTo" : "CNnerwIQARgBMAA="
    },
    "closed" : true,
    "allEnsembles" : {
      "0" : [ {
        "id" : "172.30.10.4:3181"
      }, {
        "id" : "172.30.10.3:3181"
      } ]
    },
    "ctoken" : 0
  }
}

So the broker keep sent readEntry requests to wrong bookies which are not in ledger ensemble list.

Desktop (please complete the following information):

• OS:

  # cat /etc/redhat-release
  CentOS Linux release 7.8.2003 (Core)

Additional context Bookie auto-recovery is enabled.

Machine 172.30.10.2 has crashed once at 2022-01-03 17:40:08 +08:00, and bookie instance started at 2022-01-03 19:35:08 +08:00, No ledger found log start shows after 172.30.10.2 crashed.

Possible related https://github.com/apache/pulsar/issues/7214

[zcola]

+1, I only added disks to one bookie, and the next day the error is still flashing, even if it is lost, shouldn't it be recovered through autorecovery?

[zcola]

+1, I only added disks to one bookie, and the next day the error is still flashing, even if it is lost, shouldn't it be recovered through autorecovery?

Each time you adjust one, the more "entry" you lose

[Shawyeok]

@zcola Did you try restart the broker service? In my experience, restart broker service will take effect for a while. I want figure out why it happens.

[lujiwen]

I am suffering from a similar problem too, after a bookie instance crashed, and a new instance was added into the bookkeeper cluster, my bookie log keeps saying that: No ledger found while performing readLac from ledger: xxx

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The issue had no activity for 30 days, mark with Stale label.

[github-actions[bot]]

The issue had no activity for 30 days, mark with Stale label.

[Shawyeok]

After some investigation, here are the conditions of this issue:

1. The ledger is closed.
2. The broker holds the LedgerHandle open (some subscriptions are stuck in a redelivery loop).
3. After recovery is triggered (due to a bookie crash or recreation), ensemble changes will not take effect in the LedgerHandler internal metadata.
4. After the crashed bookie restarts with its old IP or bookieId, it will receive read entry requests from ledgers that previously belonged to it.