初次使用Sqoop报错，sqoop命令不能正常使用：hcatalog does not exist!accumulo does not exist!
1、问题描述：
（1）问题示例：
[hadoop@master Tmp]$ sqoop help
Warning: /home/grid/Sqoop/sqoop-1.4.7/../hcatalog does not exist! HCatalog jobs will fail.
Please set $HCAT_HOME to the root of your HCatalog installation.
Warning: /home/grid/Sqoop/sqoop-1.4.7/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
No such sqoop tool: -help. See 'sqoop help'.
[hadoop@master Tmp]$ sqoop version
Warning: /home/grid/Sqoop/sqoop-1.4.7/../hcatalog does not exist! HCatalog jobs will fail.
Please set $HCAT_HOME to the root of your HCatalog installation.
Warning: /home/grid/Sqoop/sqoop-1.4.7/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
No such sqoop tool: -version. See 'sqoop help'.
（2）问题综述：
Sqoop工具的命令：sqoop不能正常使用，连-help查看参数、-version显示版本信息都报错。
问题的关键是：找不到，HCatalog和accumulo，这两个工具。
2、解决方案：
参考：https://blog.csdn.net/weixin_43716338/article/details/106752816
（1）找到Sqoop的配置文件：configure-sqoop
（2）找到如下段代码：
## Moved to be a runtime check in sqoop.
if [ ! -d "${HCAT_HOME}" ]; then
echo "Warning: $HCAT_HOME does not exist! HCatalog jobs will fail."
echo 'Please set $HCAT_HOME to the root of your HCatalog installation.'
fi
if [ ! -d "${ACCUMULO_HOME}" ]; then
echo "Warning: $ACCUMULO_HOME does not exist! Accumulo imports will fail."
echo 'Please set $ACCUMULO_HOME to the root of your Accumulo installation.'
fi
（3）上述代码全部用“#”注释掉，如下所示：
## Moved to be a runtime check in sqoop.
#if [ ! -d "${HCAT_HOME}" ]; then
# echo "Warning: $HCAT_HOME does not exist! HCatalog jobs will fail."
# echo 'Please set $HCAT_HOME to the root of your HCatalog installation.'
#fi
#if [ ! -d "${ACCUMULO_HOME}" ]; then
# echo "Warning: $ACCUMULO_HOME does not exist! Accumulo imports will fail."
# echo 'Please set $ACCUMULO_HOME to the root of your Accumulo installation.'
#fi
（4）结果检验：
[Hadoop@master Tmp]$ sqoop help
2021-11-05 00:55:21,339 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
usage: sqoop COMMAND [ARGS]
Available commands:
codegen Generate code to interact with database records
create-hive-table Import a table definition into Hive
eval Evaluate a SQL statement and display the results
export Export an HDFS directory to a database table
help List available commands
import Import a table from a database to HDFS
import-all-tables Import tables from a database to HDFS
import-mainframe Import datasets from a mainframe server to HDFS
job Work with saved jobs
list-databases List available databases on a server
list-tables List available tables in a database
merge Merge results of incremental imports
metast ore Run a standalone Sqoop metastore
version Display version information
See 'sqoop help COMMAND' for information on a specific command.
[Hadoop@master Tmp]$ sqoop version
2021-11-05 00:55:33,567 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
Sqoop 1.4.7
git commit id 2328971411f57f0cb683dfb79d19d4d19d185dd8
Compiled by maugli on Thu Dec 21 15:59:58 STD 2017
3、问题剖析：
就是检测上述环境变量（${HCAT_HOME}和${ACCUMULO_HOME}）是否存在，通常工具 HCatalog和Accumulo，要么没有安装，要么安装时改变了通常意义上（系统默认）的安装位置。笔者改变了上述安装位置，所以才导致上述报错。
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