hadoop - Sqoop speculative execution -

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i have below question in sqoop ?

  • i curious if can set speculative execution off/on sqoop import/export job.
  • and have option of setting number of reducers in sqoop import/export process. according analysis sqoop not require reducers, not sure if im correct. please correct me on this.
  • i have used sqoop mysql, oracle , other databases can use other above.

thanks

1) in sqoop default speculative execution off, because if multiple mappers run single task, duplicates of data in hdfs. hence avoid decrepency off.

2) number of reducers sqoop job 0, since merely job running map job dumps data hdfs. not aggregating anything.

3) can use postgresql, hsqldb along mysql, oracle. how ever direct import supported in mysql , postgre.


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