[GitHub] [pulsar] murong00 opened a new issue #4106: Improve usage hints for pulsar-perf subcommands

[GitBox <gi...@apache.org>]

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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