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From Rahul Ravindran <rahu...@yahoo.com>
Subject Re: IOException with HDFS-Sink:flushOrSync
Date Tue, 14 May 2013 03:02:10 GMT
Thanks Hari for your help in this. Appreciate it.

We will work towards upgrading to CDH 4.2.1 soon, and hopefully, this issue is resolved.

~Rahul.


________________________________
 From: Hari Shreedharan <hshreedharan@cloudera.com>
To: "user@flume.apache.org" <user@flume.apache.org> 
Sent: Monday, May 13, 2013 7:58 PM
Subject: Re: IOException with HDFS-Sink:flushOrSync
 


The patch also made it to Hadoop 2.0.3.

On Monday, May 13, 2013, Hari Shreedharan  wrote:

Looks like CDH4.2.1 does have that patch: http://archive.cloudera.com/cdh4/cdh/4/hadoop-2.0.0-cdh4.2.1.CHANGES.txt (but
it was not in CDH4.1.2)
>
>
>
>
>Hari
>
>
>-- 
>Hari Shreedharan
>
>
>On Monday, May 13, 2013 at 7:23 PM, Rahul Ravindran wrote:
>We are using cdh 4.1.2 - Hadoop version 2.0.0. Looks like cdh 4.2.1 also uses the same
Hadoop version. Any suggestions on any mitigations?
>>
>>Sent from my phone.Excuse the terseness.
>>
>>On May 13, 2013, at 7:12 PM, Hari Shreedharan <hshreedharan@cloudera.com> wrote:
>>
>>
>>What version of Hadoop are you using? Looks like you are getting hit by https://issues.apache.org/jira/browse/HADOOP-6762.

>>>
>>>
>>>
>>>
>>>Hari
>>>
>>>
>>>-- 
>>>Hari Shreedharan
>>>
>>>
>>>On Monday, May 13, 2013 at 6:50 PM, Matt Wise wrote:
>>>So we've just had this happen twice to two different flume machines... we're using
the HDFS sink as well, but ours is writing to an S3N:// URL. Both times our sink stopped working
and the filechannel clogged up immediately causing serious problems. A restart of Flume worked
-- but the filechannel was so backed up at that point that it took a good long while to get
Flume started up again properly.
>>>>
>>>>
>>>>Anyone else seeing this behavior?
>>>>
>>>>
>>>>(oh, and we're running flume 1.3.0)
>>>>
>>>>On May 7, 2013, at 8:42 AM, Rahul Ravindran <rahulrv@yahoo.com> wrote:
>>>>
>>>>Hi,
>>>>>   We have noticed this a few times now where we appear to have an IOException
from HDFS and this stops draining the channel until the flume process is restarted. Below
are the logs: namenode-v01-00b is the active namenode (namenode-v01-00a is standby). We are
using Quorum Journal Manager for our Namenode HA, but there was no Namenode failover which
was initiated. If this is an expected error, should flume handle it and gracefully retry (thereby
not requiring a restart)?
>>>>>Thanks,
>>>>>~Rahul.
>>>>>
>>>>>
>>>>>7 May 2013 06:35:02,494 WARN  [hdfs-hdfs-sink4-call-runner-2] (org.apache.flume.sink.hdfs.BucketWriter.append:378)
 - Caught IOException writing to HDFSWriter (IOException flush:java.io.IOException: Failed
on local exception: java.nio.channels.ClosedByInterruptException; Host Details : local host
is: "flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00a.a.com":8020;
). Closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-4//event.1367891734983.tmp)
and rethrowing exception.
>>>>>07 May 2013 06:35:02,494 WARN  [hdfs-hdfs-sink4-call-runner-2] (org.apache.flume.sink.hdfs.BucketWriter.append:384)
 - Caught IOException while closing file (hdfs://nameservice1/user/br/data_platform/eventstream/event/flumefs-v01-10a-4//event.1367891734983.tmp).
Exception follows.
>>>>>java.io.IOException: IOException flush:java.io.IOException: Failed on
local exception: java.nio.channels.ClosedByInterruptException; Host Details : local host is:
"flumefs-v01-10a.a.com/10.40.85.170"; destination host is: "namenode-v01-00a.a.com":8020;
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