Flume-ng出现HDFS IO error,Callable timed out异常

这两台flume-ng晚上9点~11点flume出现异常：

25 Mar 2014 22:18:25,189 ERROR [hdfs-thrift_hdfsSink-roll-timer-0] (org.apache.flume.sink.hdfs.BucketWriter$2.call:257)  - Unexpected error
java.io.IOException: Callable timed out after 10000 ms on file: /logdata/2014/03/25/software_log/197a.1395757003934.tmp
     at org.apache.flume.sink.hdfs.BucketWriter.callWithTimeout(BucketWriter.java:550)
     at org.apache.flume.sink.hdfs.BucketWriter.doFlush(BucketWriter.java:353)
     at org.apache.flume.sink.hdfs.BucketWriter.flush(BucketWriter.java:319)
     at org.apache.flume.sink.hdfs.BucketWriter.close(BucketWriter.java:277)
     at org.apache.flume.sink.hdfs.BucketWriter$2.call(BucketWriter.java:255)
     at org.apache.flume.sink.hdfs.BucketWriter$2.call(BucketWriter.java:250)
     at java.util.concurrent.FutureTask.run(FutureTask.java:262)
     at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
     at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
     at java.lang.Thread.run(Thread.java:724)
Caused by: java.util.concurrent.TimeoutException
     at java.util.concurrent.FutureTask.get(FutureTask.java:201)
     at org.apache.flume.sink.hdfs.BucketWriter.callWithTimeout(BucketWriter.java:543)
     ... 11 more
25 Mar 2014 22:34:17,639 WARN  [ResponseProcessor for block BP-928773537-10.31.246.10-1392969615809:blk_-6973900543529394933_175021] (org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer$ResponseProcessor.run:747)  - DFSOutputStream ResponseProcessor exception  for block BP-928773537-10.31.246.10-1392969615809:blk_-6973900543529394933_175021
java.io.EOFException: Premature EOF: no length prefix available
     at org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:171)
     at org.apache.hadoop.hdfs.protocol.datatransfer.PipelineAck.readFields(PipelineAck.java:114)
     at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer$ResponseProcessor.run(DFSOutputStream.java:694)

查看日志高峰期：

可以明显的看到18点开始，到23点之间是高峰期，hadoop集群百兆带宽，在日志写入高峰期时，达到带宽上限。hadoop这边我们还没有部署监控工具（-。。-）

目前解决方案：

• 根据https://blog.csdn.net/yangbutao/article/details/8845025，修改flume hdfs客户端超时时间。
• 修改hdfs.callTimeout从默认的10秒改成:40秒

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