Troubleshoot Apache Hive by using Azure HDInsight
Learn about the top questions and their resolutions when working with Apache Hive payloads in Apache Ambari.
How do I export a Hive metastore and import it on another cluster?
Connect to the HDInsight cluster by using a Secure Shell (SSH) client. For more information, see Additional reading.
Run the following command on the HDInsight cluster from which you want to export the metastore:
for d in `hive -e "show databases"`; do echo "create database $d; use $d;" >> alltables.sql ; for t in `hive --database $d -e "show tables"` ; do ddl=`hive --database $d -e "show create table $t"`; echo "$ddl ;" >> alltables.sql ; echo "$ddl" | grep -q "PARTITIONED\s*BY" && echo "MSCK REPAIR TABLE $t ;" >> alltables.sql ; done; done
This command generates a file named allatables.sql.
Copy the file alltables.sql to the new HDInsight cluster, and then run the following command:
hive -f alltables.sql
The code in the resolution steps assumes that data paths on the new cluster are the same as the data paths on the old cluster. If the data paths are different, you can manually edit the generated
alltables.sql file to reflect any changes.
How do I locate Hive logs on a cluster?
Connect to the HDInsight cluster by using SSH. For more information, see Additional reading.
To view Hive client logs, use the following command:
To view Hive metastore logs, use the following command:
To view Hive server logs, use the following command:
How do I launch the Hive shell with specific configurations on a cluster?
Specify a configuration key-value pair when you start the Hive shell. For more information, see Additional reading.
hive -hiveconf a=b
To list all effective configurations on Hive shell, use the following command:
For example, use the following command to start Hive shell with debug logging enabled on the console:
hive -hiveconf hive.root.logger=ALL,console
How do I analyze Apache Tez DAG data on a cluster-critical path?
To analyze an Apache Tez directed acyclic graph (DAG) on a cluster-critical graph, connect to the HDInsight cluster by using SSH. For more information, see Additional reading.
At a command prompt, run the following command:
hadoop jar /usr/hdp/current/tez-client/tez-job-analyzer-*.jar CriticalPath --saveResults --dagId <DagId> --eventFileName <DagData.zip>
To list other analyzers that can be used to analyze Tez DAG, use the following command:
hadoop jar /usr/hdp/current/tez-client/tez-job-analyzer-*.jar
You must provide an example program as the first argument.
Valid program names include:
- ContainerReuseAnalyzer: Print container reuse details in a DAG
- CriticalPath: Find the critical path of a DAG
- LocalityAnalyzer: Print locality details in a DAG
- ShuffleTimeAnalyzer: Analyze the shuffle time details in a DAG
- SkewAnalyzer: Analyze the skew details in a DAG
- SlowNodeAnalyzer: Print node details in a DAG
- SlowTaskIdentifier: Print slow task details in a DAG
- SlowestVertexAnalyzer: Print slowest vertex details in a DAG
- SpillAnalyzer: Print spill details in a DAG
- TaskConcurrencyAnalyzer: Print the task concurrency details in a DAG
- VertexLevelCriticalPathAnalyzer: Find the critical path at vertex level in a DAG
How do I download Tez DAG data from a cluster?
There are two ways to collect the Tez DAG data:
From the command line:
Connect to the HDInsight cluster by using SSH. At the command prompt, run the following command:
hadoop jar /usr/hdp/current/tez-client/tez-history-parser-*.jar org.apache.tez.history.ATSImportTool -downloadDir . -dagId <DagId>
Use the Ambari Tez view:
- Go to Ambari.
- Go to Tez view (under the tiles icon in the upper-right corner).
- Select the DAG you want to view.
- Select Download data.
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