murong00 opened a new issue #4106: Improve usage hints for pulsar-perf subcommands URL: https://github.com/apache/pulsar/issues/4106 **Describe the bug** When running the subcommands of `pulsar-perf` without any parameters someone may encounter as below: ``` $ bin/pulsar-perf managed-ledger ... Exception in thread "main" java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770) at org.apache.bookkeeper.zookeeper.ZooKeeperClient$Builder.build(ZooKeeperClient.java:225) at org.apache.bookkeeper.mledger.impl.ManagedLedgerFactoryImpl.<init>(ManagedLedgerFactoryImpl.java:104) at org.apache.pulsar.testclient.ManagedLedgerWriter.main(ManagedLedgerWriter.java:171) $ bin/pulsar-perf monitor-brokers Exception in thread "main" java.lang.RuntimeException: com.beust.jcommander.ParameterException: The following option is required: --connect-string $ bin/pulsar-perf read Main parameters are required ("persistent://prop/ns/my-topic") Usage: pulsar-perf-reader [options] persistent://prop/ns/my-topic ``` We should optimize the description for better usage.
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