[broker] Reduce the time it takes for namespace bundle unloading to time out

[massakam]

Motivation

When the bug that has been fixed in #12993 occurred, the topic was unavailable for 5 minutes until the namespace bundle unloading timed out.

2021-11-26T21:45:07,455+0900 [BookKeeperClientWorker-OrderedExecutor-4-0] ERROR org.apache.bookkeeper.common.util.SafeRunnable - Unexpected throwable caught
java.lang.NullPointerException: null
        at org.apache.bookkeeper.mledger.impl.OpAddEntry.addComplete(OpAddEntry.java:148) ~[managed-ledger.jar:2.10.0-SNAPSHOT]
        at org.apache.bookkeeper.client.AsyncCallback$AddCallback.addCompleteWithLatency(AsyncCallback.java:92) ~[bookkeeper-server-4.14.3.jar:4.14.3]
        at org.apache.bookkeeper.client.PendingAddOp.submitCallback(PendingAddOp.java:431) ~[bookkeeper-server-4.14.3.jar:4.14.3]
        at org.apache.bookkeeper.client.LedgerHandle.errorOutPendingAdds(LedgerHandle.java:1799) ~[bookkeeper-server-4.14.3.jar:4.14.3]
        at org.apache.bookkeeper.client.LedgerHandle$5.safeRun(LedgerHandle.java:574) ~[bookkeeper-server-4.14.3.jar:4.14.3]
        at org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36) [bookkeeper-common-4.14.3.jar:4.14.3]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_312]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_312]
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-common-4.1.68.Final.jar:4.1.68.Final]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]

...

2021-11-26T21:50:07,454+0900 [pulsar-io-18-9] WARN  org.apache.pulsar.broker.service.BrokerService - Unloading of public/default/0x00000000_0x40000000 has timed out

I think 5 minutes is too long, but this value is hard-coded and we can't change it.

pulsar/pulsar-broker/src/main/java/org/apache/pulsar/broker/namespace/NamespaceService.java

Line 667 in 6afbee6

return unloadNamespaceBundle(bundle, 5, TimeUnit.MINUTES);

Modifications

Make it possible to change the time to wait for unloading of a namespace bundle. The default value is 1 minute.

Verifying this change

• Make sure that the change passes the CI checks.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

Documentation

• doc