gharris1727 commented on PR #14055:
URL: https://github.com/apache/kafka/pull/14055#issuecomment-1642919694
Here's an example error log output when in HYBRID_FAIL mode (I shortened the
listing for brevity; the actual prints include every non-migrated plugin)
```
Plugins are missing ServiceLoader manifests, these plugins will not be
visible with plugin.discovery=SERVICE_LOAD: [
classpath org.apache.kafka.connect.converters.ByteArrayConverter
undefined
classpath org.apache.kafka.connect.converters.DoubleConverter
undefined
classpath org.apache.kafka.connect.converters.FloatConverter
undefined
classpath org.apache.kafka.connect.converters.IntegerConverter
undefined
classpath org.apache.kafka.connect.converters.LongConverter
undefined
classpath org.apache.kafka.connect.converters.ShortConverter
undefined
classpath
org.apache.kafka.connect.integration.BlockingConnectorTest$BlockingConnector
0.0.0
classpath
org.apache.kafka.connect.integration.BlockingConnectorTest$BlockingSinkConnector
0.0.0
...
classpath org.apache.kafka.connect.transforms.predicates.TopicNameMatches
undefined
]
at
app//org.apache.kafka.connect.runtime.isolation.Plugins.maybeReportHybridDiscoveryIssue(Plugins.java:131)
at
app//org.apache.kafka.connect.runtime.isolation.Plugins.initLoaders(Plugins.java:92)
at
app//org.apache.kafka.connect.runtime.isolation.Plugins.<init>(Plugins.java:74)
at
app//org.apache.kafka.connect.runtime.isolation.Plugins.<init>(Plugins.java:64)
at
app//org.apache.kafka.connect.cli.AbstractConnectCli.startConnect(AbstractConnectCli.java:121)
at
app//org.apache.kafka.connect.util.clusters.WorkerHandle.start(WorkerHandle.java:50)
at
app//org.apache.kafka.connect.util.clusters.EmbeddedConnectCluster.addWorker(EmbeddedConnectCluster.java:187)
at
app//org.apache.kafka.connect.util.clusters.EmbeddedConnectCluster.startConnect(EmbeddedConnectCluster.java:283)
at
app//org.apache.kafka.connect.util.clusters.EmbeddedConnectCluster.start(EmbeddedConnectCluster.java:148)
...
(test suite)
```
This is what appears if the manifests included in this PR are not present.
The same, but with HYBRID_WARN:
```
[2023-07-19 17:03:44,143] WARN Plugins are missing ServiceLoader manifests,
these plugins will not be visible with plugin.discovery=SERVICE_LOAD: [
classpath org.apache.kafka.connect.converters.ByteArrayConverter
undefined
...
classpath org.apache.kafka.connect.transforms.predicates.TopicNameMatches
undefined
] (org.apache.kafka.connect.runtime.isolation.Plugins:128)
```
I did notice that if logging is OFF or ERROR for the runtime (such as in the
mirror tests) then the warning doesn't print if the caller overrides the
configuration. The failure does propagate, so they will certainly see that in
HYBRID_FAIL.
I'm going to push the required manifests, so just delete/revert them if
you'd like to see these errors on the classpath.
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