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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2019/07/18 21:27:54 UTC
[GitHub] [incubator-druid] clintropolis opened a new pull request #8106: fix
npe with sql metadata manager polling and empty database
clintropolis opened a new pull request #8106: fix npe with sql metadata manager polling and empty database
URL: https://github.com/apache/incubator-druid/pull/8106
### Description
This fixes a null pointer exception that occurs in numerous places when polling for segments while having an empty metadata database after the changes of #7653. I'm not certain if this is the _correct_ fix since previously the snapshot would remain null until there were segments available during a poll, but it resolves the issue for me at least, and doesn't appear to have any ill side-effects.
```
2019-07-18T20:48:10,597 WARN [qtp265052195-81] org.eclipse.jetty.server.HttpChannel - /druid/coordinator/v1/metadata/segments
java.lang.NullPointerException
at org.apache.druid.server.http.MetadataResource.getAllUsedSegmentsWithOvershadowedStatus(MetadataResource.java:174) ~[classes/:?]
at org.apache.druid.server.http.MetadataResource.getAllUsedSegments(MetadataResource.java:142) ~[classes/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_192]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_192]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_192]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_192]
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) ~[jersey-server-1.19.3.jar:1.19.3]
```
```
2019-07-18T21:26:15,173 ERROR [Coordinator-Exec--0] org.apache.druid.server.coordinator.DruidCoordinator - Caught exception, ignoring so that schedule keeps going.: {class=org.apache.druid.server.coordinator.DruidCoordinator, exceptionType=class java.lang.NullPointerException, exceptionMessage=null}
java.lang.NullPointerException
at org.apache.druid.server.coordinator.DruidCoordinatorRuntimeParams$Builder.withSnapshotOfDataSourcesWithAllUsedSegments(DruidCoordinatorRuntimeParams.java:354) ~[classes/:?]
at org.apache.druid.server.coordinator.DruidCoordinator$CoordinatorRunnable.run(DruidCoordinator.java:657) [classes/:?]
at org.apache.druid.server.coordinator.DruidCoordinator$2.call(DruidCoordinator.java:559) [classes/:?]
```
etc.
<hr>
This PR has:
- [x] been self-reviewed.
- [x] been tested in a localhost Druid cluster.
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