Hi all , would appreciate some insight into the below error when attempting to
stream data out to HDFS. The output operator is pasted below the error.
2016-03-17 10:48:02,197 [8/DurabilityOut_HDHT:HdfsFileOutputOperator] ERROR
engine.StreamingContainer run - Operator set
[OperatorDeployInfo[id=8,name=DurabilityOut_HDHT,type=GENERIC,checkpoint={ffffffffffffffff,
0,
0},inputs=[OperatorDeployInfo.InputDeployInfo[portName=input,streamId=Records
-:-
Durability_HDHT,sourceNodeId=2,sourcePortName=recordHash,locality=<null>,partitionMask=0,partitionKeys=<null>]],outputs=[]]]
stopped running due to an exception.
com.google.common.util.concurrent.UncheckedExecutionException:
java.lang.NullPointerException
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2234)
at com.google.common.cache.LocalCache.get(LocalCache.java:3965)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3969)
at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4829)
at
com.datatorrent.lib.io.fs.AbstractFileOutputOperator.processTuple(AbstractFileOutputOperator.java:796)
at
com.datatorrent.lib.io.fs.AbstractFileOutputOperator$1.process(AbstractFileOutputOperator.java:270)
at com.datatorrent.api.DefaultInputPort.put(DefaultInputPort.java:70)
at
com.datatorrent.stram.stream.BufferServerSubscriber$BufferReservoir.sweep(BufferServerSubscriber.java:265)
at com.datatorrent.stram.engine.GenericNode.run(GenericNode.java:229)
at
com.datatorrent.stram.engine.StreamingContainer$2.run(StreamingContainer.java:1380)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.hdfs.DFSOutputStream.isLazyPersist(DFSOutputStream.java:1709)
at
org.apache.hadoop.hdfs.DFSOutputStream.getChecksum4Compute(DFSOutputStream.java:1550)
at org.apache.hadoop.hdfs.DFSOutputStream.<init>(DFSOutputStream.java:1560)
at org.apache.hadoop.hdfs.DFSOutputStream.<init>(DFSOutputStream.java:1667)
at
org.apache.hadoop.hdfs.DFSOutputStream.newStreamForAppend(DFSOutputStream.java:1694)
at org.apache.hadoop.hdfs.DFSClient.callAppend(DFSClient.java:1824)
at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:1885)
at org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:1855)
at
org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:340)
at
org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:336)
at
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem.append(DistributedFileSystem.java:348)
at
org.apache.hadoop.hdfs.DistributedFileSystem.append(DistributedFileSystem.java:318)
at org.apache.hadoop.fs.FileSystem.append(FileSystem.java:1164)
at
com.datatorrent.lib.io.fs.AbstractFileOutputOperator.openStream(AbstractFileOutputOperator.java:641)
at
com.datatorrent.lib.io.fs.AbstractFileOutputOperator$2.load(AbstractFileOutputOperator.java:550)
at
com.datatorrent.lib.io.fs.AbstractFileOutputOperator$2.load(AbstractFileOutputOperator.java:504)
at
com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3568)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2350)
at
com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2313)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2228)
package com.capitalone.vault8.citadel.operators.impl;
import com.datatorrent.api.Context;
import com.datatorrent.lib.io.fs.AbstractFileOutputOperator;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.IOException;
/**
* Ingest a file, and emit it timestamped (line-by-line) into Apex. <p/> <a
* href="mailto:[email protected]";>Vault 8</a>
*
* @author Vault 8
*/
public class HdfsFileOutputOperator extends AbstractFileOutputOperator<String> {
transient BufferedReader br = null;
private static Logger LOG =
LoggerFactory.getLogger(HdfsFileOutputOperator.class.toString());
private static String idDelim = "@";
private String coreSite;
private String hdfsSite;
private String outputFileName;
private transient int operatorId;
// Because every operator may have multiple physical partitions, we should
organize the data by
// partition
private transient String operatorUniquePath;
public String getHdfsSite() {
return hdfsSite;
}
public void setHdfsSite(String hdfsSite) {
this.hdfsSite = hdfsSite;
}
public String getCoreSite() {
return coreSite;
}
public void setCoreSite(String coreSite) {
this.coreSite = coreSite;
}
// Set the actual name of the file on HDFS
public void setOutputFileName(String outputFileName) {
this.outputFileName = outputFileName;
}
// Get the name of of the file
public String getOutputFileName() {
return outputFileName;
}
// Override method to get the absolute path for the output
@Override
protected String getFileName(String tuple) {
return operatorUniquePath;
}
@Override
public void setup(Context.OperatorContext context) {
super.setup(context);
operatorId = context.getId();
operatorUniquePath = new Path(getOutputFileName() + idDelim + operatorId +
".txt").toString();
}
/**
* This method is used to provide the FileSystem for the operator. This
allows us to use HDFS
*/
@Override
protected FileSystem getFSInstance() throws IOException {
Configuration config = new Configuration();
// Update the configuration here
try {
config.addResource(new Path(getCoreSite()));
config.addResource(new Path(getHdfsSite()));
} catch (IllegalArgumentException e) {
LOG.warn("Tried to create an empty path ", e);
}
FileSystem tempFS = FileSystem.newInstance(new Path(filePath).toUri(),
config);
if (tempFS instanceof LocalFileSystem) {
tempFS = ((LocalFileSystem) tempFS).getRaw();
}
return tempFS;
}
@Override
protected byte[] getBytesForTuple(String tuple) {
return tuple.getBytes();
}
}
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