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[FLINK-2555] Properly pass security credentials in the Hadoop Input/O…
…utput format wrappers This is needed because the Hadoop IF/OF's are using Hadoop's FileSystem stack, which is using the security credentials passed in the JobConf / Job class in the getSplits() method. Note that access to secured Hadoop 1.x using Hadoop IF/OF's is not possible with this change. This limitation is due to missing methods in the old APIs. - Add some comments & change dependency scope to test
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77 changes: 77 additions & 0 deletions
77
...va/src/main/java/org/apache/flink/api/java/hadoop/common/HadoopInputFormatCommonBase.java
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you under the Apache License, Version 2.0 (the | ||
* "License"); you may not use this file except in compliance | ||
* with the License. You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
package org.apache.flink.api.java.hadoop.common; | ||
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import org.apache.flink.api.common.io.RichInputFormat; | ||
import org.apache.flink.core.io.InputSplit; | ||
import org.apache.hadoop.security.Credentials; | ||
import org.apache.hadoop.security.UserGroupInformation; | ||
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import java.io.IOException; | ||
import java.io.ObjectInputStream; | ||
import java.io.ObjectOutputStream; | ||
import java.lang.reflect.InvocationTargetException; | ||
import java.lang.reflect.Method; | ||
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/** | ||
* A common base for both "mapred" and "mapreduce" Hadoop input formats. | ||
*/ | ||
public abstract class HadoopInputFormatCommonBase<T, SPITTYPE extends InputSplit> extends RichInputFormat<T, SPITTYPE> { | ||
protected transient Credentials credentials; | ||
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protected HadoopInputFormatCommonBase(Credentials creds) { | ||
this.credentials = creds; | ||
} | ||
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protected void write(ObjectOutputStream out) throws IOException { | ||
this.credentials.write(out); | ||
} | ||
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public void read(ObjectInputStream in) throws IOException { | ||
this.credentials = new Credentials(); | ||
credentials.readFields(in); | ||
} | ||
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/** | ||
* This method only exists because there is no UserGroupInformation.getCredentials() method | ||
* in Hadoop 1.x | ||
* | ||
* Note that this method returns "null" in Hadoop 1.x environments. | ||
* | ||
* @param ugi The user information | ||
* @return new credentials object from the user information. MAY RETURN NULL! | ||
*/ | ||
public static Credentials getCredentialsFromUGI(UserGroupInformation ugi) { | ||
Method getCredentialsMethod = null; | ||
for(Method m: ugi.getClass().getMethods()) { | ||
if(m.getName().equals("getCredentials")) { | ||
getCredentialsMethod = m; | ||
break; | ||
} | ||
} | ||
if(getCredentialsMethod == null) { | ||
return null; | ||
} else { | ||
try { | ||
return (Credentials) getCredentialsMethod.invoke(ugi); | ||
} catch (InvocationTargetException | IllegalAccessException e) { | ||
throw new RuntimeException("Unable to get credentials from UserGroupInformation. This is only supported by Hadoop 2.2.0+"); | ||
} | ||
} | ||
} | ||
} |
47 changes: 47 additions & 0 deletions
47
...a/src/main/java/org/apache/flink/api/java/hadoop/common/HadoopOutputFormatCommonBase.java
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you under the Apache License, Version 2.0 (the | ||
* "License"); you may not use this file except in compliance | ||
* with the License. You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
package org.apache.flink.api.java.hadoop.common; | ||
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import org.apache.flink.api.common.io.RichOutputFormat; | ||
import org.apache.hadoop.security.Credentials; | ||
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import java.io.IOException; | ||
import java.io.ObjectInputStream; | ||
import java.io.ObjectOutputStream; | ||
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/** | ||
* A common base for both "mapred" and "mapreduce" Hadoop output formats. | ||
* | ||
* The base is taking care of handling (serializing) security credentials. | ||
*/ | ||
public abstract class HadoopOutputFormatCommonBase<T> extends RichOutputFormat<T> { | ||
protected transient Credentials credentials; | ||
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protected HadoopOutputFormatCommonBase(Credentials creds) { | ||
this.credentials = creds; | ||
} | ||
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protected void write(ObjectOutputStream out) throws IOException { | ||
this.credentials.write(out); | ||
} | ||
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public void read(ObjectInputStream in) throws IOException { | ||
this.credentials = new Credentials(); | ||
credentials.readFields(in); | ||
} | ||
} |
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