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Pachyderm vs Apache Spark: What are the differences?
Pachyderm: MapReduce without Hadoop. Analyze massive datasets with Docker. Pachyderm is an open source MapReduce engine that uses Docker containers for distributed computations; Apache Spark: Fast and general engine for large-scale data processing. Spark is a fast and general processing engine compatible with Hadoop data. It can run in Hadoop clusters through YARN or Spark's standalone mode, and it can process data in HDFS, HBase, Cassandra, Hive, and any Hadoop InputFormat. It is designed to perform both batch processing (similar to MapReduce) and new workloads like streaming, interactive queries, and machine learning.
Pachyderm and Apache Spark can be categorized as "Big Data" tools.
Some of the features offered by Pachyderm are:
- Git-like File System
- Dockerized MapReduce
- Microservice Architecture
On the other hand, Apache Spark provides the following key features:
- Run programs up to 100x faster than Hadoop MapReduce in memory, or 10x faster on disk
- Write applications quickly in Java, Scala or Python
- Combine SQL, streaming, and complex analytics
Pachyderm and Apache Spark are both open source tools. Apache Spark with 22.3K GitHub stars and 19.3K forks on GitHub appears to be more popular than Pachyderm with 3.78K GitHub stars and 364 GitHub forks.
We have a Kafka topic having events of type A and type B. We need to perform an inner join on both type of events using some common field (primary-key). The joined events to be inserted in Elasticsearch.
In usual cases, type A and type B events (with same key) observed to be close upto 15 minutes. But in some cases they may be far from each other, lets say 6 hours. Sometimes event of either of the types never come.
In all cases, we should be able to find joined events instantly after they are joined and not-joined events within 15 minutes.
ElasticsearchThe first solution that came to me is to use upsert to update ElasticSearch:
- Use the primary-key as ES document id
- Upsert the records to ES as soon as you receive them. As you are using upsert, the 2nd record of the same primary-key will not overwrite the 1st one, but will be merged with it.
Cons: The load on ES will be higher, due to upsert.
To use Flink:
- Create a KeyedDataStream by the primary-key
- In the ProcessFunction, save the first record in a State. At the same time, create a Timer for 15 minutes in the future
- When the 2nd record comes, read the 1st record from the State, merge those two, and send out the result, and clear the State and the Timer if it has not fired
- When the Timer fires, read the 1st record from the State and send out as the output record.
- Have a 2nd Timer of 6 hours (or more) if you are not using Windowing to clean up the State
Pro: if you have already having Flink ingesting this stream. Otherwise, I would just go with the 1st solution.
Apache SparkPlease refer "Structured Streaming" feature of Spark. Refer "Stream - Stream Join" at https://spark.apache.org/docs/latest/structured-streaming-programming-guide.html#stream-stream-joins . In short you need to specify "Define watermark delays on both inputs" and "Define a constraint on time across the two inputs"
AWS Glue combined with Spark and S3 has allowed to simplify processing large datasets.
With our ever increasing data footprint, utilizing S3 as our Hadoop storage layer, Glue as our Hive metastore, and Spark as our map reduce tool, we've allowed for timely reporting across our multi-terabyte dataset without dealing with Hadoop level complexity.
Pros of Pachyderm
- Containers3
- Versioning1
- Can run on GCP or AWS1
Pros of Apache Spark
- Open-source59
- Fast and Flexible48
- One platform for every big data problem8
- Great for distributed SQL like applications7
- Easy to install and to use6
- Works well for most Datascience usecases3
- Interactive Query2
- In memory Computation2
- Machine learning libratimery, Streaming in real2
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Cons of Pachyderm
Cons of Apache Spark
- Speed3
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