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https://issues.apache.org/jira/browse/SQOOP-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sandish Kumar HN reassigned SQOOP-3179:
---------------------------------------
Assignee: Sandish Kumar HN
> Add Sqoop1 (import + --incremental lastmodified + --check-column) support for
> NULLs
> -----------------------------------------------------------------------------------
>
> Key: SQOOP-3179
> URL: https://issues.apache.org/jira/browse/SQOOP-3179
> Project: Sqoop
> Issue Type: Improvement
> Reporter: Markus Kemper
> Assignee: Sandish Kumar HN
>
> When using Sqoop (import + --incremental lastmodified + --check-column) if
> the check column contains NULLs the rows are ignored.
> Please consider adding the ability to include check column NULL values
> {noformat}
> #################
> # STEP 01 - Create RDBMS Table and Data
> #################
> export MYCONN=jdbc:oracle:thin:@myoracle.mydomain.com:1521/db11g
> export MYUSER=sqoop
> export MYPSWD=sqoop
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "drop table t1"
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "create table t1 (c1 int, c2 date, c3 varchar(15), c4 timestamp)"
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "insert into t1 values (1, sysdate, 'data row 1', sysdate)"
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "select * from t1 order by c1"
> ------------------------------------------------------------------
> | C1 | C2 | C3 | C4 |
> ------------------------------------------------------------------
> | 1 | 2017-05-04 15:17:33.0 | data row 1 | 2017-05-04
> 15:17:33 |
> ------------------------------------------------------------------
> #################
> # STEP 02 - Create Sqoop Incremental Import Job
> #################
> sqoop job --create inc_import_hdfs -- import --connect $MYCONN --username
> $MYUSER --password $MYPSWD --table T1 --target-dir /user/root/t1
> --incremental lastmodified --check-column C4 --merge-key C1 --last-value
> '2017-01-01 00:00:00' --as-textfile --map-column-java C2=String,C4=String
> --fields-terminated-by '\001' --lines-terminated-by '\n' --num-mappers 1
> --verbose --hive-drop-import-delims
> #################
> # STEP 03 - Execute Job and Verify data in HDFS
> #################
> hdfs dfs -rm -r /user/root/t1
> sqoop job --exec inc_import_hdfs -- --connect $MYCONN --username $MYUSER
> --password $MYPSWD
> hdfs dfs -cat /user/root/t1/part*
> Output:
> 17/05/04 15:25:20 INFO mapreduce.ImportJobBase: Transferred 55 bytes in
> 24.6352 seconds (2.2326 bytes/sec)
> 17/05/04 15:25:20 INFO mapreduce.ImportJobBase: Retrieved 1 records.
> ~~~~~
> 12017-05-04 15:17:33.0data row 12017-05-04 15:17:33
> #################
> # STEP 04 - Insert New Rows (one with NULL --check-column)
> #################
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "insert into t1 values (2, sysdate, 'data row 2', NULL)"
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "insert into t1 values (3, sysdate, 'data row 3', sysdate)"
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "select * from t1 order by c1"
> Output:
> ------------------------------------------------------------------
> | C1 | C2 | C3 | C4 |
> ------------------------------------------------------------------
> | 1 | 2017-05-04 15:17:33.0 | data row 1 | 2017-05-04
> 15:17:33 |
> | 2 | 2017-05-04 15:27:19.0 | data row 2 | (null)
> |
> | 3 | 2017-05-04 15:27:22.0 | data row 3 | 2017-05-04
> 15:27:22 |
> ------------------------------------------------------------------
> #################
> # STEP 05 - Execute Job and Verify data in HDFS (row with NULL --check-column
> is not imported)
> #################
> sqoop job --exec inc_import_hdfs -- --connect $MYCONN --username $MYUSER
> --password $MYPSWD
> hdfs dfs -cat /user/root/t1/part*
> Output:
> 17/05/04 15:28:22 INFO mapreduce.ImportJobBase: Transferred 55 bytes in
> 21.6227 seconds (2.5436 bytes/sec)
> 17/05/04 15:28:22 INFO mapreduce.ImportJobBase: Retrieved 1 records.
> ~~~~~
> 12017-05-04 15:17:33.0data row 12017-05-04 15:17:33
> 32017-05-04 15:27:22.0data row 32017-05-04 15:27:22
> #################
> # STEP 06 - Update Row with NULL --check-column, Execute Job and Verify data
> in HDFS
> #################
> sqoop eval --connect $MYCONN --username $MYUSER --password $MYPSWD --query
> "update t1 set c4 = sysdate where c1 = 2"
> sqoop job --exec inc_import_hdfs -- --connect $MYCONN --username $MYUSER
> --password $MYPSWD
> hdfs dfs -cat /user/root/t1/part*
> Output:
> 17/05/04 15:32:47 INFO mapreduce.ImportJobBase: Transferred 55 bytes in
> 27.2132 seconds (2.0211 bytes/sec)
> 17/05/04 15:32:47 INFO mapreduce.ImportJobBase: Retrieved 1 records.
> ~~~~~
> 12017-05-04 15:17:33.0data row 12017-05-04 15:17:33
> 22017-05-04 15:27:19.0data row 22017-05-04 15:31:55 <===
> 32017-05-04 15:27:22.0data row 32017-05-04 15:27:22
> {noformat}
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