issue about "HDFS IO error" in flume log

hi,maillist:

i get following info when use flume ,and i checked
HDFSDataStream.java:80
,it's says

boolean appending = false;
if (conf.getBoolean("hdfs.append.support", false) == true & hdfs.isFile
(dstPath)) {
outStream = hdfs.append(dstPath);
appending = true;
} else {
80: outStream = hdfs.create(dstPath);

and i also checked the HDFS code , in org.apache.hadoop.hdfs.DFSConfigKeys
file i can not search "hdfs.append.support",instead of this

public static final String DFS_SUPPORT_APPEND_KEY = "dfs.support.append";

so if flume broke when append content to a file ,when it restart, the code
in if statement will never be executed,that's a bug !!

25 Dec 2013 05:34:23,119 INFO
[SinkRunner-PollingRunner-DefaultSinkProcessor]
(org.apache.flume.sink.hdfs.BucketWriter.open:219) - Creating
/user/hive/warehouse/adx.db/ssp_res

ponse/2013-12-23/.FlumeData.1387777961215.tmp

25 Dec 2013 05:34:23,119 WARN
[SinkRunner-PollingRunner-DefaultSinkProcessor]
(org.apache.flume.sink.hdfs.HDFSEventSink.process:418) - HDFS IO error

java.io.IOException: Filesystem closed

at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:565)

at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1247)

at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1212)

at
org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:276)

at
org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:265)

at
org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:82)

at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:886)

at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:867)

at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:766)

at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:755)

at
org.apache.flume.sink.hdfs.HDFSDataStream.open(HDFSDataStream.java:80)

at
org.apache.flume.sink.hdfs.BucketWriter$1.call(BucketWriter.java:227)

at
org.apache.flume.sink.hdfs.BucketWriter$1.call(BucketWriter.java:220)

at
org.apache.flume.sink.hdfs.BucketWriter$8$1.run(BucketWriter.java:536)

at
org.apache.flume.sink.hdfs.BucketWriter.runPrivileged(BucketWriter.java:160)

at
org.apache.flume.sink.hdfs.BucketWriter.access$1000(BucketWriter.java:56)

at
org.apache.flume.sink.hdfs.BucketWriter$8.call(BucketWriter.java:533)

at java.util.concurrent.FutureTask.run(FutureTask.java:262)

at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:744)