Fix invalid rack name cause bookie join rack failed

[hangc0276]

Motivation

When user set rack name to / or empty string "", it will cause all matched bookies join target rack failed and throw the following exception

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1841) ~[?:?]
        at org.apache.bookkeeper.net.NetworkTopologyImpl$InnerNode.getNextAncestorName(NetworkTopologyImpl.java:144) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.net.NetworkTopologyImpl$InnerNode.add(NetworkTopologyImpl.java:180) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.net.NetworkTopologyImpl.add(NetworkTopologyImpl.java:425) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.handleBookiesThatJoined(TopologyAwareEnsemblePlacementPolicy.java:717) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicyImpl.handleBookiesThatJoined(RackawareEnsemblePlacementPolicyImpl.java:80) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicy.handleBookiesThatJoined(RackawareEnsemblePlacementPolicy.java:249) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy.onClusterChanged(TopologyAwareEnsemblePlacementPolicy.java:663) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicyImpl.onClusterChanged(RackawareEnsemblePlacementPolicyImpl.java:80) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicy.onClusterChanged(RackawareEnsemblePlacementPolicy.java:92) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.BookieWatcherImpl.processWritableBookiesChanged(BookieWatcherImpl.java:197) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.client.BookieWatcherImpl.lambda$initialBlockingBookieRead$1(BookieWatcherImpl.java:233) ~[io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.discover.ZKRegistrationClient$WatchTask.accept(ZKRegistrationClient.java:147) [io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at org.apache.bookkeeper.discover.ZKRegistrationClient$WatchTask.accept(ZKRegistrationClient.java:70) [io.streamnative-bookkeeper-server-4.14.3.1.jar:4.14.3.1]
        at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:859) [?:?]
        at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:837) [?:?]
        at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) [?:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
        at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) [?:?]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [io.netty-netty-common-4.1.72.Final.jar:4.1.72.Final]
        at java.lang.Thread.run(Thread.java:829) [?:?]

Which will lead ledger create failed and throw ManagedLedgerException: Not enough non-faulty bookies available

Modification

1. Add rack name checker on bookie rack info set.
2. For the has been set rack name, we add a checker in BookieRackAffinityMapping, and return null to fallback to /default-rack or /default-region/default-rack
3. I will add a checker in BookKeeper client side to avoid StringIndexOutOfBoundsException

Documentation

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[gaoran10]

Could we add a check for the param rack at bookie cmd?

[hangc0276]

Could we add a check for the param rack at bookie cmd?

@gaoran10 Thanks for you review, I added the check on cmdBookie side.

[gaoran10]

Lgtm

[Anonymitaet]

pulsar-admin bookies is not shown on https://pulsar.apache.org/tools/pulsar-admin/2.10.0-SNAPSHOT/. @urfreespace will investigate this issue. If pulsar-admin bookies can not be shown on https://pulsar.apache.org/tools/pulsar-admin/2.10.0-SNAPSHOT/, I'll add the docs to https://pulsar.apache.org/docs/en/next/reference-cli-tools/#bookie

[lhotari]

I didn't find a way to cherry-pick this cleanly to branch-2.7. I'll move this to 2.7.6. Please open a separate PR for branch-2.7.

[hangc0276]

I didn't find a way to cherry-pick this cleanly to branch-2.7. I'll move this to 2.7.6. Please open a separate PR for branch-2.7.

@lhotari I will create another PR for branch-2.7

[Jason918]

Move release/2.7.5 label to #16845