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Posted to common-issues@hadoop.apache.org by "Mikhail Bernadsky (JIRA)" <ji...@apache.org> on 2014/06/08 07:37:01 UTC

[jira] [Created] (HADOOP-10669) Avro serialization does not flush buffered serialized values causing data lost

Mikhail Bernadsky created HADOOP-10669:
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             Summary: Avro serialization does not flush buffered serialized values causing data lost
                 Key: HADOOP-10669
                 URL: https://issues.apache.org/jira/browse/HADOOP-10669
             Project: Hadoop Common
          Issue Type: Bug
          Components: io
    Affects Versions: 2.4.0
            Reporter: Mikhail Bernadsky


Found this debugging Nutch. 

MapTask serializes keys and values to the same stream, in pairs: 

keySerializer.serialize(key); 
..... 
valSerializer.serialize(value);
 ..... 
bb.write(b0, 0, 0); 

AvroSerializer does not flush its buffer after each serialization. So if it is used for valSerializer, the values are only partially written or not written at all to the output stream before the record is marked as complete (the last line above).



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