[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-27 Thread kevin su (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

kevin su updated HBASE-22089:
-
Attachment: HBASE-22089.v0.patch

> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Assignee: kevin su
>Priority: Minor
> Attachments: HBASE-22089.v0.patch
>
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}
> getClusterSchema() might return null when cluster schema service is not ready 
> yet. Actually, it won't be ready until HMaster#initClusterSchemaService() is 
> finished. See [this 
> comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
>  for details.
> We need to add protections, like adding null check before calling 
> getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
> wait until this.clusterSchemaService is not null.



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[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-22 Thread Xiang Li (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiang Li updated HBASE-22089:
-
Description: 
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet. Actually, it won't be ready until HMaster#initClusterSchemaService() is 
finished. See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.

We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.clusterSchemaService is not null.

  was:
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet. Actually, it won't be ready until HMaster#initClusterSchemaService() is 
finished. See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.clusterSchemaService is not null.


> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Priority: Minor
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}
> getClusterSchema() might return null when cluster schema service is not ready 
> yet. Actually, it won't be ready until HMaster#initClusterSchemaService() is 
> finished. See [this 
> comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
>  for details.
> We need to add protections, like adding null check before calling 
> getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
> wait until this.clusterSchemaService is not null.



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[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-22 Thread Xiang Li (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiang Li updated HBASE-22089:
-
Description: 
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet. Actually, it won't be ready until it is not ready 
HMaster#initClusterSchemaService() is finished. See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.clusterSchemaService is not null.

  was:
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet (it is one of the steps to start HMaster). See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.clusterSchemaService is not null.


> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Priority: Minor
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}
> getClusterSchema() might return null when cluster schema service is not ready 
> yet. Actually, it won't be ready until it is not ready 
> HMaster#initClusterSchemaService() is finished. See [this 
> comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
>  for details.
> We need to add protections, like adding null check before calling 
> getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
> wait until this.clusterSchemaService is not null.



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[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-22 Thread Xiang Li (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiang Li updated HBASE-22089:
-
Description: 
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet. Actually, it won't be ready until HMaster#initClusterSchemaService() is 
finished. See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.clusterSchemaService is not null.

  was:
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet. Actually, it won't be ready until it is not ready 
HMaster#initClusterSchemaService() is finished. See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.clusterSchemaService is not null.


> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Priority: Minor
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}
> getClusterSchema() might return null when cluster schema service is not ready 
> yet. Actually, it won't be ready until HMaster#initClusterSchemaService() is 
> finished. See [this 
> comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
>  for details.
> We need to add protections, like adding null check before calling 
> getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
> wait until this.clusterSchemaService is not null.



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[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-22 Thread Xiang Li (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiang Li updated HBASE-22089:
-
Description: 
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet (it is one of the steps to start HMaster). See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.clusterSchemaService is not null.

  was:
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet (it is one of the steps to start HMaster). See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.


> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Priority: Minor
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}
> getClusterSchema() might return null when cluster schema service is not ready 
> yet (it is one of the steps to start HMaster). See [this 
> comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
>  for details.
> We need to add protections, like adding null check before calling 
> getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
> wait until this.clusterSchemaService is not null.



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[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-22 Thread Xiang Li (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiang Li updated HBASE-22089:
-
Description: 
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet (it is one of the steps to start HMaster). See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add protections, like adding null check before calling 
getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
wait until this.

  was:
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet (it is one of the steps to start HMaster). See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add a protection here (like adding null check before calling 
getClusterSchema().getXXX()).


> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Priority: Minor
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}
> getClusterSchema() might return null when cluster schema service is not ready 
> yet (it is one of the steps to start HMaster). See [this 
> comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
>  for details.
> We need to add protections, like adding null check before calling 
> getClusterSchema().getXXX(), or in HMaster#getClusterSchema(), add a loop to 
> wait until this.



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[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-22 Thread Xiang Li (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiang Li updated HBASE-22089:
-
Description: 
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}
getClusterSchema() might return null when cluster schema service is not ready 
yet (it is one of the steps to start HMaster). See [this 
comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
 for details.
We need to add a protection here (like adding null check before calling 
getClusterSchema().getXXX()).

  was:
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}


> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Priority: Minor
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}
> getClusterSchema() might return null when cluster schema service is not ready 
> yet (it is one of the steps to start HMaster). See [this 
> comment|https://issues.apache.org/jira/browse/HBASE-20690?focusedCommentId=16784549&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16784549]
>  for details.
> We need to add a protection here (like adding null check before calling 
> getClusterSchema().getXXX()).



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[jira] [Updated] (HBASE-22089) HMaster#getClusterSchema() could return null and cause NPE

2019-03-22 Thread Xiang Li (JIRA) 


 [ 
https://issues.apache.org/jira/browse/HBASE-22089?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xiang Li updated HBASE-22089:
-
Description: 
HMaster#getClusterSchema() has a lot of usage, for example:
{code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
void assignTableToGroup(TableDescriptor desc) throws IOException {
  String groupName =
  
master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
  ...
}
{code}

> HMaster#getClusterSchema() could return null and cause NPE
> --
>
> Key: HBASE-22089
> URL: https://issues.apache.org/jira/browse/HBASE-22089
> Project: HBase
>  Issue Type: Improvement
>  Components: master
>Reporter: Xiang Li
>Priority: Minor
>
> HMaster#getClusterSchema() has a lot of usage, for example:
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java|borderStyle=solid}
> void assignTableToGroup(TableDescriptor desc) throws IOException {
>   String groupName =
>   
> master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
> .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
>   ...
> }
> {code}



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