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Posted to dev@flume.apache.org by "Inder SIngh (Updated) (JIRA)" <ji...@apache.org> on 2012/03/30 07:29:23 UTC
[jira] [Updated] (FLUME-1080) Issue with HDFSEventSink for append
support
[ https://issues.apache.org/jira/browse/FLUME-1080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Inder SIngh updated FLUME-1080:
-------------------------------
Attachment: FLUME-1080-1.patch
Patch to address first write when append="true"
> Issue with HDFSEventSink for append support
> --------------------------------------------
>
> Key: FLUME-1080
> URL: https://issues.apache.org/jira/browse/FLUME-1080
> Project: Flume
> Issue Type: Bug
> Reporter: Inder SIngh
> Attachments: FLUME-1080-1.patch
>
>
> Enabled append feature in HDFS and flume conf
> Hit the following exceptions -
> 2012-03-29 13:27:03,284 (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:370)] HDFS IO error
> java.io.FileNotFoundException: java.io.FileNotFoundException: failed to append to non-existent file /flume.0.tmp on client 127.0.0.1
> org.apache.hadoop.hdfs.DFSClient.append(DFSClient.java:586)
> at org.apache.hadoop.hdfs.DistributedFileSystem.append(DistributedFileSystem.java:209)
> at org.apache.hadoop.fs.FileSystem.append(FileSystem.java:630)
> at org.apache.flume.sink.hdfs.HDFSDataStream.open(HDFSDataStream.java:42)
> at org.apache.flume.sink.hdfs.BucketWriter.open(BucketWriter.java:82)
> at org.apache.flume.sink.hdfs.BucketWriter.open(BucketWriter.java:102)
> at org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:342)
> at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:65)
> at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:148)
> at java.lang.Thread.run(Thread.java:680)
> Caused by: org.apache.hadoop.ipc.RemoteException: java.io.FileNotFoundException: failed to append to non-existent file /flume.0.tmp on client 127.0.0.1
> at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1187)
> at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFile(FSNamesystem.java:1357)
> at org.apache.hadoop.hdfs.server.namenode.NameNode.append(NameNode.java:600)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> Looking at the code and debugging further looks like the case of first write when append="true" isn't handled.
> Here is the code in picture -> HDFSDataStream.open
> if (conf.getBoolean("hdfs.append.support", false) == true) {
> outStream = hdfs.append(dstPath);
> } else {
> outStream = hdfs.create(dstPath);
> }
> it should be something like this -
> if (conf.getBoolean("hdfs.append.support", false) == true && hdfs.isFile(dstPath)) {
> outStream = hdfs.append(dstPath);
> } else {
> outStream = hdfs.create(dstPath);
> }
>
> Refer - http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/fs/FileSystem.html - append works on an existent file.
> Pardon my ignorance and correct me if am missing something here
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