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https://issues.apache.org/jira/browse/HBASE-9510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765740#comment-13765740
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Francis Liu commented on HBASE-9510:
------------------------------------
Since FSTableDescriptors.get() returns null on non-existent. Shouldn't we be
consistent and do the same. At least for the non-rpc apis I believe it should
return null to be consistent?
Regarding listTablesByNS api. I think it should return non-existent namespace
exceptions. Else it seems to be masking an error?
On a slightly related note can you remove change the delimiter used by
tableNameFoo to use the constant, seems I missed that :-). It's in
createDoubleTest.
> Namespace operations should throw clean exceptions
> --------------------------------------------------
>
> Key: HBASE-9510
> URL: https://issues.apache.org/jira/browse/HBASE-9510
> Project: HBase
> Issue Type: Bug
> Components: master
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 0.98.0, 0.96.0
>
> Attachments: hbase-9510_v1.patch, hbase-9510_v2.patch
>
>
> Some of the namespace operations does not throw clean exceptions mimicking
> table exceptions (TableNotFoundException, etc).
> For example:
> {code}
> hbase(main):007:0> describe_namespace 'non_existing_namespace'
> ERROR: java.io.IOException
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2117)
> at
> org.apache.hadoop.hbase.ipc.RpcServer$CallRunner.run(RpcServer.java:1816)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcScheduler.java:165)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$0(SimpleRpcScheduler.java:161)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler.java:113)
> at java.lang.Thread.run(Thread.java:680)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.protobuf.ProtobufUtil.toProtoNamespaceDescriptor(ProtobufUtil.java:2138)
> at
> org.apache.hadoop.hbase.master.HMaster.getNamespaceDescriptor(HMaster.java:3029)
> at
> org.apache.hadoop.hbase.protobuf.generated.MasterAdminProtos$MasterAdminService$2.callBlockingMethod(MasterAdminProtos.java:32904)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2079)
> ... 5 more
> {code}
> We can clean up the exceptions thrown from ns commands.
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