[jira] [Created] (FLINK-1013) ArithmeticException: / by zero in MutableHashTable

["Till Rohrmann (JIRA)" <ji...@apache.org>]

Till Rohrmann created FLINK-1013:
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             Summary: ArithmeticException: / by zero in MutableHashTable
                 Key: FLINK-1013
                 URL: https://issues.apache.org/jira/browse/FLINK-1013
             Project: Flink
          Issue Type: Bug
            Reporter: Till Rohrmann


I encountered a division by zero exception in the MutableHashTable. It happened when I joined two datasets of relatively big records (approx. 40-50 MB I think). When joining them the buildTableFromSpilledPartition method of the MutableHashTable is called. In case that the available buffers are smaller than the needed number of buffers, the mutable hash table will calculate the bucket count
{code}
bucketCount = (int) (((long) totalBuffersAvailable) * RECORD_TABLE_BYTES / (avgRecordLenPartition + RECORD_OVERHEAD_BYTES));
{code}

If the average record length is sufficiently large, then the bucket count will be 0. Initializing the hash table with a 0 bucket count will cause then the division by 0 exception. I don't know whether this problem can be mitigated but it should at least throw a meaningful exception instead of the ArithmeticException.



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