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https://issues.apache.org/jira/browse/HADOOP-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675051#action_12675051
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Ben Maurer commented on HADOOP-5268:
------------------------------------
FYI, I got the same error and it was fixed on the .19.1 release candidates
> Using MultipleOutputFormat and setting reducers to 0 causes
> org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException and job to fail
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-5268
> URL: https://issues.apache.org/jira/browse/HADOOP-5268
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Thibaut
>
> Hi,
> I'm trying to save the sorting step by only runnign the map phase (setting
> the reducers to 0), but my job will fail then.
> The job runs fine when the reduce phase is activated.
> I'm using MultipleInputFormat and MultipleOutputFormat. Here is my
> outputformat class, below is the exception.
> public class MultipleSequenceFileOutputFormat<K extends WritableComparable, V
> extends Writable> extends MultipleOutputFormat<K, V> {
> private SequenceFileOutputFormat<K, V> sequencefileoutputformat = null;
> private String uniqueprefix = "";
> private boolean set = false;
> private static Random r = new Random();
> @Override
> protected RecordWriter<K, V> getBaseRecordWriter(FileSystem fs, JobConf
> job, String name, Progressable arg3) throws IOException {
> if (sequencefileoutputformat == null) {
> sequencefileoutputformat = new SequenceFileOutputFormat<K, V>();
> }
> return sequencefileoutputformat.getRecordWriter(fs, job, name, arg3);
> }
> @Override
> protected String generateFileNameForKeyValue(K key, V value, String name) {
> if (!set) {
> synchronized (r) {
> uniqueprefix = new Long(System.currentTimeMillis()).toString()
> + "_" + r.nextInt();
> set = true;
> }
> }
> return "prefix....." + uniqueprefix + "_" + name;
> }
> @Override
> public void checkOutputSpecs(FileSystem fs, JobConf conf) {
> }
> org.apache.hadoop.ipc.RemoteException:
> org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException: failed to
> create file ......1234809836818_-1723031414_part-00000 for
> DFSClient_attempt_200902111714_0492_m_000000_0 on client 192.168.0.6 because
> current leaseholder is trying to recreate file.
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1052)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:995)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:301)
> at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:452)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:892)
> at org.apache.hadoop.ipc.Client.call(Client.java:696)
> at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
> at $Proxy1.create(Unknown Source)
> at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
> at $Proxy1.create(Unknown Source)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.(DFSClient.java:2587)
> at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:454)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:169)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:487)
> at
> org.apache.hadoop.io.SequenceFile$BlockCompressWriter.(SequenceFile.java:1198)
> at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:401)
> at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:354)
> at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:427)
> at
> org.apache.hadoop.mapred.SequenceFileOutputFormat.getRecordWriter(SequenceFileOutputFormat.java:57)
> at
> MultipleSequenceFileOutputFormat.getBaseRecordWriter(MultipleSequenceFileOutputFormat.java:33)
> at
> org.apache.hadoop.mapred.lib.MultipleOutputFormat$1.write(MultipleOutputFormat.java:99)
> at
> org.apache.hadoop.mapred.MapTask$DirectMapOutputCollector.collect(MapTask.java:385)
> at ...
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