How to resolve the issue when Hive cannot read data from HBase.

2 years ago
William Carter
2 minutes

If Hive is unable to read HBase data, it may be due to the following reasons:

  1. Check if the HBase table exists: Make sure the HBase table you are trying to query has been created in HBase and data has been inserted into it.
  2. Check the HBase storage handler for Hive: Make sure that the configuration file for Hive (hive-site.xml) has been properly configured for the HBase storage handler. In this configuration file, hive.execution.engine should be set to mr, and hive.hbase.wal.enabled should be set to false.
  3. Check the HBase dependency of Hive: Make sure that the classpath of Hive includes the relevant HBase dependency libraries. You can set the HADOOP_CLASSPATH in the Hive configuration file (hive-env.sh) to add the HBase dependency library path.
  4. Check the definition of the HBase table in Hive: Make sure that the HBase table is properly defined in Hive. You can use the CREATE EXTERNAL TABLE statement to define the HBase table and specify the storage handler using STORED BY ‘org.apache.hadoop.hive.hbase.HBaseStorageHandler’.
  5. Check the HBase table query statements in Hive to ensure the correct syntax is used when querying the HBase table. You can use the SELECT statement to query the HBase table and specify column mappings using statements like TBLPROPERTIES (“hbase.columns.mapping” = “:key,cf:col1,cf:col2”).

If the problem still cannot be resolved, you can check the log files of Hive and HBase for more detailed error information, and debug and resolve the issue based on the error information.

bannerAds