sqoop使用心得

目前笔者趟了sqoop的坑，把mysql的数据导入hive

1. sqoop版本选取

    笔者最先尝试的是sqoop1.9，1.9的sqoop分为两个部分，server端和client端，官网说还有web端，server端是一个常驻进程，负责connect，job的管理和执行，client端可以远程连接server，向 server提交请求，和获取server状态，目前的版本不支持数据导入hive，所以选取1.4.6版本，其实两个版本都是把数据导入HDFS临时文件夹再move到hive目录下，1.9需要hive手动从hdfs load

2. sqoop安装配置

    直接从官网下载可运行的tar包解压到本地，配置sqoop-env.sh文件，配置如下

▽
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# included in all the hadoop scripts with source command
# should not be executable directly
# also should not be passed any arguments, since we need original $*

# Set Hadoop-specific environment variables here.

#Set path to where bin/hadoop is available
export HADOOP_COMMON_HOME=/home/work/hadoop/hadoop-2.7.3


export ZOOKEEPER_HOME=/home/work/hadoop/zookeeper-3.4.9
export HIVE_CONF_DIR=/home/work/hadoop/hive-2.1.1/conf
#Set path to where hadoop-*-core.jar is available
export HADOOP_MAPRED_HOME=/home/work/hadoop/hadoop-2.7.3/share/hadoop/mapreduce

#set the path to where bin/hbase is available
export HBASE_HOME=/home/work/hadoop/hbase-1.2.4

#Set the path to where bin/hive is available
#export HIVE_HOME=

#Set the path for where zookeper config dir is
export ZOOCFGDIR=/home/work/hadoop/zookeeper-3.4.9/conf

3. 创建表

Create table test (id int, username string,passwd string)
Row format delimited fields terminated by ‘t’
Lines terminated by ‘n’
Stored as textfile

4.数据导入

./sqoop import --connect jdbc:mysql://10.33.240.93:3308/test --username hadoop --password 7897  --query "select user_name ,user_id,identype from users where $CONDITIONS" --hive-import --hive-database test_odbc --hive-table users --split-by user_id --fields-terminated-by '1' --lines-terminated-by 'n' --target-dir /user/hive/tmp/users --hive-delims-replacement ' ' —create-hive-table

5. 问题

• 数据导入完后发现数据会增多，因为hive的数据文件的列分隔符和行分隔符被包含在了字段中，可以用--hive-delims replacement ' ' 这个变量用比的字符代替字段中的分割符或用--hive-drop-import-delims删掉字段中的分割符
• mysql用户权限问题，中途报1045错误

最后

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