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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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