GitHub user rnowacoski created a discussion: Multi-Topic subscription across
tenant and namespace using regex in Java client throws IllegalArgumentException
**Describe the bug**
When using a regex to create a consumer and a regex pattern is present in the
tenant or namespace section of the pattern this error is thrown.
```
java.lang.IllegalArgumentException: Invalid named entity: \w+
at
org.apache.pulsar.common.naming.NamedEntity.checkName(NamedEntity.java:39)
at
org.apache.pulsar.common.naming.NamespaceName.validateNamespaceName(NamespaceName.java:179)
at
org.apache.pulsar.common.naming.NamespaceName.get(NamespaceName.java:53)
at org.apache.pulsar.common.naming.TopicName.<init>(TopicName.java:151)
at org.apache.pulsar.common.naming.TopicName.<init>(TopicName.java:38)
at org.apache.pulsar.common.naming.TopicName$1.load(TopicName.java:63)
at org.apache.pulsar.common.naming.TopicName$1.load(TopicName.java:60)
at
org.apache.pulsar.shade.com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at
org.apache.pulsar.shade.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2276)
at
org.apache.pulsar.shade.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2154)
at
org.apache.pulsar.shade.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2044)
at
org.apache.pulsar.shade.com.google.common.cache.LocalCache.get(LocalCache.java:3951)
at
org.apache.pulsar.shade.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3973)
at
org.apache.pulsar.shade.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4957)
at org.apache.pulsar.common.naming.TopicName.get(TopicName.java:88)
at
org.apache.pulsar.client.impl.PulsarClientImpl.patternTopicSubscribeAsync(PulsarClientImpl.java:403)
at
org.apache.pulsar.client.impl.PulsarClientImpl.subscribeAsync(PulsarClientImpl.java:333)
at
org.apache.pulsar.client.impl.ConsumerBuilderImpl.subscribeAsync(ConsumerBuilderImpl.java:142)
at
org.apache.pulsar.client.impl.ConsumerBuilderImpl.subscribe(ConsumerBuilderImpl.java:99)
```
Example pattern: `persistent://\w+/Test/Test1` or `persistent://Test/\w+/Test1`
This is because `PulsarClientImpl.patternTopicSubscribeAsync` is called when
creating a consumer using a Pattern. This calls `topicName.get(regex);` where
regex is the Pattern passed in. This method attempts to validate the tenant and
namespace names against this regex `^[-=:.\\w]*$` in
org.apache.pulsar.common.naming.NamedEntity. This fails for any regex pattern.
The namespace name is needed in the current code because it is used by
`LookupService.getTopicsUnderNamespace` to find the topics to subscribe to.
**To Reproduce**
Steps to reproduce the behavior:
1. Create a Consumer like below
```
client
.newConsumer(Schema.BYTES)
.topicsPattern(Pattern.compile("persistent://\w+/Test/Test1"))
.subscribe()
```
2. Observe `java.lang.IllegalArgumentException: Invalid named entity: \w+` is
thrown
**Expected behavior**
Given a wildcard in a tenant or namespace I would expect the code to look up
all tenants/namespaces that match and then lookup all topics to subscribe to.
**Proposed Solution**
1. LookupService implementations should implement a method like
`getNamespaces()` that will return all tenant/namespaces.
2. `PulsarClientImpl.patternTopicSubscribeAsync` should filter these namespaces
based on the regex given
3. For each renaming namespace that matches the given regex
`PulsarClientImpl.patternTopicSubscribeAsync` should call
`LookupService.getTopicsUnderNamespace`
4. List of topics for each matching namespace should be combined into one list
and the consumer should subscribe to all of those topics
GitHub link: https://github.com/apache/pulsar/discussions/18862
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