sqoop incremental lastmodified with merge-key -

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i trying import updated records in hdfs. earlier had 3 part file in hdfs.when run below tool gave error merge key required.

sqoop import --table employee --username training --password training --connect jdbc:mysql://localhost/loudacre --incremental lastmodified --check-column modified --last-value '2016-08-22 19:02:41'

however, when used merge-key option can see part file records in it.

this expected guess. generally, merge tool run after incremental import --incremental lastmodified mode.

when merging datasets, assumed there unique primary key value in each record (mentioned --merge-key).

the merge tool run mapreduce job merge datasets one, taking newest available rows each --merge-key.

check sqoop docs more details.


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