Skip to main content

Switch to HiveServer2 and Beeline

By Anonymous
Listen:
In Hive 0.11 HiveServer2 [2] was introduced, its time to switch from the old Hive CLI to the modern version. Why?
First, security [1]. Hive CLI bypasses the Apache HiveServer2 and calls a MR job directly. This behavior compromises any security projects like Apache Sentry [3]. With HiveServer2 the Kerberos impersonation brings fine granulated security down to HiveSQL. Its possible to enable a strong security layer with Kerberos, Apache Sentry [3] and Apache HDFS ACL [4], like other DWHs have.
Second, HiveServer2 brings connection concurrency to Hive. This allows multiple connections from different users and clients per JDBC (remote and per Beeline) over Thrift.
Third, the Hive CLI command could be deprecated in the future, this is discussed within the Hive Developer Community.

For the first steps a beeline connection can be established per

beeline -u jdbc:hive2://<SERVER>:<PORT>/<DB> -n USERNAME -p PASSWORD

The URI describes the JDBC connection string, followed by the database the user want to query. The same string can be used for remote JDBC connections, too. Additional, the connection parameters are easy to default in a Kerberos enabled environment per .bashrc like

 alias hive2='beeline -u jdbc:hive2://HOST:PORT/DB -n $USER'

(The use of hive should be prohibited (per chmod 700, as example) to avoid bypassing HiveServer2.)

All leading distributions have HiveServer2 included, and the use of Beeline is well documented and pretty easy. Cloudera wrote a great Blogpost [5] about a migration from Hive CLI to Beeline, additional client information are available in the Beeline-Wiki [7]. Beeline and HS2 works in a multi-tenant Tez environment [8].

Snippets

 

Use Beeline in background [6]:
export HADOOP_CLIENT_OPTS="-Djline.terminal=jline.UnsupportedTerminal"
nohup beeline -u jdbc:hive2://<HOST>:<PORT>/DB -n <USER> -p <PASS> -d org.apache.hive.jdbc.HiveDriver -f hql_script &”

Query a table per CLI:
beeline -u jdbc:hive2://<HOST>:<PORT>/DB -n <USER> -p <PASS> -e "select count(*) from (select a.sender, a.recipient, b.recipient as c from transactions a join transactions b on a.recipient = b.sender where a.time < b.time and b.time - a.time < 5) i;"

Labels:

Comments

Post a Comment

Popular posts from this blog

Beyond Ctrl+F - Use LLM's For PDF Analysis

By
PDFs are everywhere, seemingly indestructible, and present in our daily lives at all thinkable and unthinkable positions. We've all got mountains of them, and even companies shouting about "digital transformation" haven't managed to escape their clutches. Now, I'm a product guy, not a document management guru. But I started thinking: if PDFs are omnipresent in our existence, why not throw some cutting-edge AI at the problem? Maybe Large Language Models (LLMs) and Retrieval Augmented Generation (RAG) could be the answer. Don't get me wrong, PDF search indexes like Solr exist, but they're basically glorified Ctrl+F. They point you to the right file, but don't actually help you understand what's in it. And sure, Microsoft Fabric's got some fancy PDF Q&A stuff, but it's a complex beast with a hefty price tag. That's why I decided to experiment with LLMs and RAG. My idea? An intelligent knowledge base built on top of our existing P...
Post a Comment
Read more

Deal with corrupted messages in Apache Kafka

By
Under some strange circumstances, it can happen that a message in a Kafka topic is corrupted. This often happens when using 3rd party frameworks with Kafka. In addition, Kafka < 0.9 does not have a lock on Log.read() at the consumer read level, but does have a lock on Log.write(). This can lead to a rare race condition as described in KAKFA-2477 [1]. A likely log entry looks like this: ERROR Error processing message, stopping consumer: (kafka.tools.ConsoleConsumer$) kafka.message.InvalidMessageException: Message is corrupt (stored crc = xxxxxxxxxx, computed crc = yyyyyyyyyy Kafka-Tools Kafka stores the offset of each consumer in Zookeeper. To read the offsets, Kafka provides handy tools [2]. But you can also use zkCli.sh, at least to display the consumer and the stored offsets. First we need to find the consumer for a topic (> Kafka 0.9): bin/kafka-consumer-groups.sh --zookeeper management01:2181 --describe --group test Prior to Kafka 0.9, the only way to get this in...
Post a Comment
Read more

What Makes You The Number 1 Product Manager?

By
Amazon often does this thing where they start with the customer instead of just coming up with a product and then trying to figure out how to sell it. They call it " working backwards. " This strategy totally works for any product decisions, but it's especially important when they're making something new. The Press Release Exercise When it comes to launching new stuff, product managers usually start by writing a press release for customers. This press release is all about their pain points, how current solutions fall short, and how the new product is going to crush it. If the benefits don't get customers excited, the product manager needs to keep tweaking the press release until it sounds super awesome. It's way easier and cheaper to make changes to a press release than it is to change the product itself. Here’s a template I use to describe a new service or product: Main heade r: The product name anyone directly understands, like “Ultra-compact power charger” ...
Post a Comment
Read more