[jira] [Created] (AVRO-1419) java.io.IOException: Invalid sync! throw after random number of sync() calls.

["Deepak Kumar V (JIRA)" <ji...@apache.org>]

Deepak Kumar V created AVRO-1419:
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             Summary: java.io.IOException: Invalid sync! throw after random number of sync() calls.
                 Key: AVRO-1419
                 URL: https://issues.apache.org/jira/browse/AVRO-1419
             Project: Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.7.5
            Reporter: Deepak Kumar V


I have a 340 MB avro data file that contains records sorted and identified by unique id (duplicate records exists). At the beginning of every unique record a synchronization point is created with DataFileWriter.sync(). (I cannot or do not want to save the sync points and i do not want to use SortedKeyValueFile as output format for M/R job)  

There are at-least 25k synchronization points in a 340 MB file.

Ex:
Marker1_RecordA1_RecordA2_RecordA3_Marker2_RecordB1_RecordB2


As records are sorted and marked, for efficient retrieval, binary search is performed. Most of the times the search is successful, at times the code throws the following exception
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org.apache.avro.AvroRuntimeException: java.io.IOException: Invalid sync! at org.apache.avro.file.DataFileStream.hasNext(DataFileStream.java:210 
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I note down the position that was used to invoke fileReader.sync(mid); and catch AvroRuntimeException, close and open the file and sync(mid) i do not see exception. 

Why should Avro throw exception before and not later ?
1.7.5v of library is throwing this error. Raising a major defect, adjust the priority at your convenience. 



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