Technoboy- opened a new pull request #11969:
URL: https://github.com/apache/pulsar/pull/11969
## Motivation
When the user reset the cursor and does not find the next valid one, the
original log does'nt print position info.
```
12:13:36.676 [pulsar-web-67-14] INFO
org.apache.pulsar.broker.service.persistent.PersistentSubscription -
[persistent://public/default/test][sub] Successfully disconnected consumers
from subscription, proceeding with cursor reset
12:13:36.676 [bookkeeper-ml-workers-OrderedExecutor-2-0] ERROR
org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl -
[public/default/persistent/test] Can't find next valid position, fail back to
the next position of the last position.
java.lang.NullPointerException: null
at
org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.getNextValidPositionInternal(ManagedLedgerImpl.java:3031)
~[io.streamnative-managed-ledger-2.7.2.10.jar:2.7.2.10]
at
org.apache.bookkeeper.mledger.impl.ManagedLedgerImpl.getNextValidPosition(ManagedLedgerImpl.java:3018)
~[io.streamnative-managed-ledger-2.7.2.10.jar:2.7.2.10]
at
org.apache.bookkeeper.mledger.impl.ManagedCursorImpl.lambda$asyncResetCursor$6(ManagedCursorImpl.java:1086)
~[io.streamnative-managed-ledger-2.7.2.10.jar:2.7.2.10]
at
org.apache.bookkeeper.mledger.util.SafeRun$1.safeRun(SafeRun.java:32)
[io.streamnative-managed-ledger-2.7.2.10.jar:2.7.2.10]
at
org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36)
[org.apache.bookkeeper-bookkeeper-common-4.12.0.jar:4.12.0]
at
org.apache.bookkeeper.common.util.OrderedExecutor$TimedRunnable.run(OrderedExecutor.java:203)
[org.apache.bookkeeper-bookkeeper-common-4.12.0.jar:4.12.0]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_281]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_281]
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[io.netty-netty-common-4.1.60.Final.jar:4.1.60.Final]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_281]
```
So it's better to add position info to the log.
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