-Re: Flume 1.3.0 + HDFS Sink + S3N + avro _vent + Hive…?
Matt Wise 2013-05-08, 20:21
I found the bug just a little bit ago...
> agent.sinks.s3.hdfs.batchSize = 10000
> -agent.sinks.s3.hdfs.serializer = avro_event
> -agent.sinks.s3.hdfs.fileType = SequenceFile
> +agent.sinks.s3.hdfs.writeFormat = Text
> +agent.sinks.s3.hdfs.fileType = DataStream
> agent.sinks.s3.hdfs.timeZone = UTC
> +agent.sinks.s3.hdfs.filePrefix = FlumeData
> +agent.sinks.s3.hdfs.fileSuffix = .avro
> +agent.sinks.s3.serializer = avro_event
Essentially I was setting the serializer in the wrong part of the configuration, and Flume wasn't letting me know.. once I fixed that, using the avro-tools package on the files created by this Sink seems to work just fine. Its terribly un-documented, but it does seem to work now.
On May 8, 2013, at 1:12 PM, Eric Sammer <[EMAIL PROTECTED]> wrote:
> This is because what you're actually doing is writing Avro records into Hadoop Sequence Files. The Avro tools only know how to read Avro Data Files (which are, effectively, meant to supercede Sequence Files). The serializer plugin only says "write each event as an Avro record." It doesn't say "write these Avro records as an Avro Data File." It's all very confusing, admittedly. I don't think we support writing Avro Data Files with the HDFS sink today. In other words, you need to use the Sequence File APIs to read the *files* produced by Flume. The records within those files will, however, be Avro records.
> On Wed, May 8, 2013 at 10:42 AM, Matt Wise <[EMAIL PROTECTED]> wrote:
> We're still working on getting our POC of Flume up and running... right now we have log events that pass through our Flume nodes via a Syslog input and are happily sent off to ElasticSearch for indexing. We're also sending these events to S3, but we're finding that they seem to be unreadable with the avro tools.
>> # S3 Output Sink
>> agent.sinks.s3.type = hdfs
>> agent.sinks.s3.channel = fc1
>> agent.sinks.s3.hdfs.path = s3n://XXX:XXX@our_bucket/flume/events/%y-%m-%d/%H
>> agent.sinks.s3.hdfs.rollInterval = 600
>> agent.sinks.s3.hdfs.rollSize = 0
>> agent.sinks.s3.hdfs.rollCount = 10000
>> agent.sinks.s3.hdfs.batchSize = 10000
>> agent.sinks.s3.hdfs.serializer = avro_event
>> agent.sinks.s3.hdfs.fileType = SequenceFile
>> agent.sinks.s3.hdfs.timeZone = UTC
> When we try to look at the avro-serialized files, we get this error:
>> [localhost avro]$ java -jar avro-tools-1.7.4.jar getschema FlumeData.1367857371493
>> Exception in thread "main" java.io.IOException: Not a data file.
>> at org.apache.avro.file.DataFileStream.initialize(DataFileStream.java:105)
>> at org.apache.avro.file.DataFileReader.<init>(DataFileReader.java:97)
>> at org.apache.avro.file.DataFileReader.<init>(DataFileReader.java:89)
>> at org.apache.avro.tool.DataFileGetSchemaTool.run(DataFileGetSchemaTool.java:48)
>> at org.apache.avro.tool.Main.run(Main.java:80)
>> at org.apache.avro.tool.Main.main(Main.java:69)
> At this point we're a bit unclear how we're supposed to use these FlumeData files with normal Avro tools?
> Eric Sammer
> twitter: esammer
> data: www.cloudera.com