[FLUME-1175] RollingFileSink complains of Bad File Descriptor upon a reconfig event

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.2.0
• Fix Version/s: 1.4.0
• Component/s: Sinks+Sources

Environment

CentOS 6.2 64-bit

• Assignee: Roshan Naik
• Reporter: Will McQueen
• Created: 03/May/12 09:40
• Updated: 08/Dec/12 01:32
• Resolved: 07/Dec/12 16:13

Description

Steps:
1) Create a config file that looks something like this:
agent.channels = c1
agent.sources = r1
agent.sinks = k1
#
agent.channels.c1.type = MEMORY
#
agent.sources.r1.channels = c1
agent.sources.r1.type = SEQ
#
agent.sinks.k1.channel = c1
agent.sinks.k1.type = FILE_ROLL
agent.sinks.k1.sink.directory = /var/log/flume-ng
agent.sinks.k1.sink.rollInterval = 0

2) Start the Flume NG agent

3) touch the config file so that a reconfig event is triggered within 30 secs

4) tail the output file to observer the sequence generator events:
tail -f /var/log/flume-ng/XXXXXXXXXXXX

5) Notice that the flow suddenly stops at the reconfig event (within 30 secs after touching the config file). Flow doesn't continue. The flume log shows a Bad File Descriptor error for the RollingFileSink:

2012-05-03 01:34:34,806 (SinkRunner-PollingRunner-DefaultSinkProcessor) [ERROR - org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:160)] Unable to deliver event. Exception follows.
org.apache.flume.EventDeliveryException: Failed to process event: [Event headers =

{timestamp=1336034074797, nanos=3762297996593382, pri=INFO, host=<mysupersecrethost>, FlumeOG=yes, execcmd=java.nio.HeapByteBuffer[pos=0 lim=24 cap=24], procsource=java.nio.HeapByteBuffer[pos=0 lim=6 cap=6], service=java.nio.HeapByteBuffer[pos=0 lim=4 cap=4]}

, body.length = 26 ]
at org.apache.flume.sink.RollingFileSink.process(RollingFileSink.java:201)
at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:68)
at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:147)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Bad file descriptor
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:282)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at org.apache.flume.sink.RollingFileSink.process(RollingFileSink.java:193)
... 3 more

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