Short circuit local reads in Cloudera Search - search

I would like to know if short circuit local reads works with Cloudera Search? I think this can have significant performance improvement but I could not find any documentation on this feature.

According to Cloudera:
Short circuit reads have not been enabled nor tested for Solr, as there is not a major performance improvement to be gained by using SCLR. Solr would only see performance improvement on startups, while the caches are warmed. If you would like to remove the WARN message from your logs, you could add the following to the Solr Service Configuration-> Default Group -> Advanced -> Java Configuration Options for Solr Server:
-Djava.library.path=/opt/cloudera/parcels/CDH/lib/hadoop/lib/native
This will remove the WARN messages from your logs.

Related

Shopware 6 partitioning

Has anyone had any experience with database partitioning? We already have a lot of data and queries on it are already starting to slow down. Maybe someone has some examples? These are tables related to orders.
Shopware, since version 6.4.12.0, allows the use of database clusters, see the relevant documentation. You will have to set up a number read-only nodes first. The load of reading data will then be distributed among the read-only nodes while write operations are restricted to the primary node.
Note that in a cluster setup you should also use a lock storage that compliments the setup.
Besides using a DB cluster you can also try to reduce the load of the db server.
The first thing you should enable the HTTP-Cache, still better to additionaly also set up a reverse cache like varnish. This will greatly decrease the number of requests that hit your webserver and thus your DB server as well.
Besides all those measures explained here should improve the overall performance of your shop as well as decreasing load on the DB.
Additionally you could use Elasticsearch, so that costly search requests won't hit the Database. And use a "real" MessageQueue, so that the messages are not stored in the Database. And use Redis instead of the database for the storage of performance critical information as is documented in the articles in this category of the official docs.
The impact of all those measures probably depends on your concrete project setup, so maybe you see in the DB locks something that hints to one of the points i mentioned previously, so that would be an indicator to start in that direction. E.g. if you see a lot of search related queries Elasticsearch would be a great start, but if you see a lot of DB load coming from writing/reading/deleting messages, then the MessageQueue might be a better starting point.
All in all when you use a DB cluster with a primary and multiple replicas and use the additional services i mentioned here your shop should be able to scale quite well without the need for partitioning the actual DB.

Is there a simple Jmeter performance test case for Cassandra

We are creating Jmeter performance benchmarking for our Cassandra installation.
For which we have been referring to the default Cassandra plugin mentioned in the site
This plugin does not take any Cassandra server connection parameter for the "put", no much help is also present to how to use this plugin.
Some can help me with this plugin if any one knows how to configure Cassandra connection
Hence we switched to an article to test Cassandra with Groovy. (Link here)
This site calls to add multiple jar some are bundles and cannot find the exeat JAR
snappy-java-1.0.5
netty-transport-4.0.33.Final
netty-handler-4.0.33.Final
netty-common-4.0.33.Final
netty-codec-4.0.33.Final
netty-buffer-4.0.33.Final
metrics-core-3.1.2
lz4-1.2.0
HdrHistogram-2.1.4
guava-16.0.1
Can some help me with some simpler test perform on Cassandra ?
For correct performance testing of Cassandra it's better to use specialized tools, like NoSQLBench that was developed specifically for that task. Generic tools won't give you the real performance numbers. Please read NoSQLBench documentation on how to correctly test Cassandra to take into account things like compaction, repairs, etc.
Have you tried to read documentation which mentions CassandraProperties configuration element where you can define your connection server parameters:
If you want to have the full control and not only be limited to what other guys implemented you can consider following instructions from Cassandra Load Testing with Groovy article

Solr vs. ElasticSearch [closed]

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What are the core architectural differences between these technologies?
Also, what use cases are generally more appropriate for each?
Update
Now that the question scope has been corrected, I might add something in this regard as well:
There are many comparisons between Apache Solr and ElasticSearch available, so I'll reference those I found most useful myself, i.e. covering the most important aspects:
Bob Yoplait already linked kimchy's answer to ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage?, which summarizes the reasons why he went ahead and created ElasticSearch, which in his opinion provides a much superior distributed model and ease of use in comparison to Solr.
Ryan Sonnek's Realtime Search: Solr vs Elasticsearch provides an insightful analysis/comparison and explains why he switched from Solr to ElasticSeach, despite being a happy Solr user already - he summarizes this as follows:
Solr may be the weapon of choice when building standard search
applications, but Elasticsearch takes it to the next level with an
architecture for creating modern realtime search applications.
Percolation is an exciting and innovative feature that singlehandedly
blows Solr right out of the water. Elasticsearch is scalable, speedy
and a dream to integrate with. Adios Solr, it was nice knowing you. [emphasis mine]
The Wikipedia article on ElasticSearch quotes a comparison from the reputed German iX magazine, listing advantages and disadvantages, which pretty much summarize what has been said above already:
Advantages:
ElasticSearch is distributed. No separate project required. Replicas are near real-time too, which is called "Push replication".
ElasticSearch fully supports the near real-time search of Apache
Lucene.
Handling multitenancy is not a special configuration, where
with Solr a more advanced setup is necessary.
ElasticSearch introduces
the concept of the Gateway, which makes full backups easier.
Disadvantages:
Only one main developer [not applicable anymore according to the current elasticsearch GitHub organization, besides having a pretty active committer base in the first place]
No autowarming feature [not applicable anymore according to the new Index Warmup API]
Initial Answer
They are completely different technologies addressing completely different use cases, thus cannot be compared at all in any meaningful way:
Apache Solr - Apache Solr offers Lucene's capabilities in an easy to use, fast search server with additional features like faceting, scalability and much more
Amazon ElastiCache - Amazon ElastiCache is a web service that makes it easy to deploy, operate, and scale an in-memory cache in the cloud.
Please note that Amazon ElastiCache is protocol-compliant with Memcached, a widely adopted memory object caching system, so code, applications, and popular tools that you use today with existing Memcached environments will work seamlessly with the service (see Memcached for details).
[emphasis mine]
Maybe this has been confused with the following two related technologies one way or another:
ElasticSearch - It is an Open Source (Apache 2), Distributed, RESTful, Search Engine built on top of Apache Lucene.
Amazon CloudSearch - Amazon CloudSearch is a fully-managed search service in the cloud that allows customers to easily integrate fast and highly scalable search functionality into their applications.
The Solr and ElasticSearch offerings sound strikingly similar at first sight, and both use the same backend search engine, namely Apache Lucene.
While Solr is older, quite versatile and mature and widely used accordingly, ElasticSearch has been developed specifically to address Solr shortcomings with scalability requirements in modern cloud environments, which are hard(er) to address with Solr.
As such it would probably be most useful to compare ElasticSearch with the recently introduced Amazon CloudSearch (see the introductory post Start Searching in One Hour for Less Than $100 / Month), because both claim to cover the same use cases in principle.
I see some of the above answers are now a bit out of date. From my perspective, and I work with both Solr(Cloud and non-Cloud) and ElasticSearch on a daily basis, here are some interesting differences:
Community: Solr has a bigger, more mature user, dev, and contributor community. ES has a smaller, but active community of users and a growing community of contributors
Maturity: Solr is more mature, but ES has grown rapidly and I consider it stable
Performance: hard to judge. I/we have not done direct performance benchmarks. A person at LinkedIn did compare Solr vs. ES vs. Sensei once, but the initial results should be ignored because they used non-expert setup for both Solr and ES.
Design: People love Solr. The Java API is somewhat verbose, but people like how it's put together. Solr code is unfortunately not always very pretty. Also, ES has sharding, real-time replication, document and routing built-in. While some of this exists in Solr, too, it feels a bit like an after-thought.
Support: there are companies providing tech and consulting support for both Solr and ElasticSearch. I think the only company that provides support for both is Sematext (disclosure: I'm Sematext founder)
Scalability: both can be scaled to very large clusters. ES is easier to scale than pre-Solr 4.0 version of Solr, but with Solr 4.0 that's no longer the case.
For more thorough coverage of Solr vs. ElasticSearch topic have a look at https://sematext.com/blog/solr-vs-elasticsearch-part-1-overview/ . This is the first post in the series of posts from Sematext doing direct and neutral Solr vs. ElasticSearch comparison. Disclosure: I work at Sematext.
I see that a lot of folks here have answered this ElasticSearch vs Solr question in terms of features and functionality but I don't see much discussion here (or elsewhere) regarding how they compare in terms of performance.
That is why I decided to conduct my own investigation. I took an already coded heterogenous data source micro-service that already used Solr for term search. I switched out Solr for ElasticSearch then I ran both versions on AWS with an already coded load test application and captured the performance metrics for subsequent analysis.
Here is what I found. ElasticSearch had 13% higher throughput when it came to indexing documents but Solr was ten times faster. When it came to querying for documents, Solr had five times more throughput and was five times faster than ElasticSearch.
Since the long history of Apache Solr, I think one strength of the Solr is its ecosystem. There are many Solr plugins for different types of data and purposes.
Search platform in the following layers from bottom to top:
Data
Purpose: Represent various data types and sources
Document building
Purpose: Build document information for indexing
Indexing and searching
Purpose: Build and query a document index
Logic enhancement
Purpose: Additional logic for processing search queries and results
Search platform service
Purpose: Add additional functionalities of search engine core to provide a service platform.
UI application
Purpose: End-user search interface or applications
Reference article : Enterprise search
I have been working on both solr and elastic search for .Net applications.
The major difference what i have faced is
Elastic search :
More code and less configuration, however there are api's to change
but still is a code change
for complex types, type within types i.e nested types(wasn't able to achieve in solr)
Solr :
less code and more configuration and hence less maintenance
for grouping results during querying(lots of work to achieve in
elastic search in short no straight way)
I have created a table of major differences between elasticsearch and Solr and splunk, you can use it as 2016 update:
While all of the above links have merit, and have benefited me greatly in the past, as a linguist "exposed" to various Lucene search engines for the last 15 years, I have to say that elastic-search development is very fast in Python. That being said, some of the code felt non-intuitive to me. So, I reached out to one component of the ELK stack, Kibana, from an open source perspective, and found that I could generate the somewhat cryptic code of elasticsearch very easily in Kibana. Also, I could pull Chrome Sense es queries into Kibana as well. If you use Kibana to evaluate es, it will further speed up your evaluation. What took hours to run on other platforms was up and running in JSON in Sense on top of elasticsearch (RESTful interface) in a few minutes at worst (largest data sets); in seconds at best. The documentation for elasticsearch, while 700+ pages, didn't answer questions I had that normally would be resolved in SOLR or other Lucene documentation, which obviously took more time to analyze. Also, you may want to take a look at Aggregates in elastic-search, which have taken Faceting to a new level.
Bigger picture: if you're doing data science, text analytics, or computational linguistics, elasticsearch has some ranking algorithms that seem to innovate well in the information retrieval area. If you're using any TF/IDF algorithms, Text Frequency/Inverse Document Frequency, elasticsearch extends this 1960's algorithm to a new level, even using BM25, Best Match 25, and other Relevancy Ranking algorithms. So, if you are scoring or ranking words, phrases or sentences, elasticsearch does this scoring on the fly, without the large overhead of other data analytics approaches that take hours--another elasticsearch time savings.
With es, combining some of the strengths of bucketing from aggregations with the real-time JSON data relevancy scoring and ranking, you could find a winning combination, depending on either your agile (stories) or architectural(use cases) approach.
Note: did see a similar discussion on aggregations above, but not on aggregations and relevancy scoring--my apology for any overlap.
Disclosure: I don't work for elastic and won't be able to benefit in the near future from their excellent work due to a different architecural path, unless I do some charity work with elasticsearch, which wouldn't be a bad idea
If you are already using SOLR, remain stick to it. If you are starting up, go for Elastic search.
Maximum major issues have been fixed in SOLR and it is quite mature.
Imagine the use case:
A lot(100+) of small(10Mb-100Mb, 1000-100000 documents) search indexes.
They are using by a lot of applications (microservices)
Each application can use more than one index
Small by size index, yes. But huge load(hundreds search-requests per second) and requests are complex (multiple aggregations, conditions and so on)
Downtimes are not allowed
All of that is working years long, and constantly growing.
Idea to have individual ES instance per each index - is huge overhead in this case.
Based on my experience, this kind of use case is very complex to support with Elasticsearch.
Why?
FIRST.
The major problem is fundamental back compatibility disregard.
Breaking changes are so cool!
(Note: imagine SQL-server which require you to do small change in all your SQL-statements, when upgraded... can't imagine it. But for ES it's normal)
Deprecations which will dropped in next major release are so sexy!
(Note: you know, Java contain some deprecations, which 20+ years old, but still working in actual Java version...)
And not only that, sometimes you even have something which nowhere documented (personally came across only once but... )
So. If you want to upgrade ES (because you need new features for some app or you want to get bug fixes) - you are in hell. Especially if it is about major version upgrade.
Client API will not back compatible. Index settings will not back compatible.
And upgrade all app/services same moment with ES upgrade is not realistic.
But you must do it time to time. No other way.
Existing indexes is automatically upgraded? - Yes. But it not help you when you will need to change some old-index settings.
To live with that, you need constantly invest a lot of power in ... forward compatibility of you apps/services with future releases of ES.
Or you need to build(and anyway constantly support) some kind of middleware between you app/services and ES, which provide you back compatible client API.
(And, you can't use Transport Client (because it required jar upgrade for every minor version ES upgrade), and this fact do not make your life easier)
Is it looks simple & cheap? No, it's not. Far from it.
Continuous maintenance of complex infrastructure which based on ES, is way to expensive in all possible senses.
SECOND.
Simple API ? Well... no really.
When you is really using complex conditions and aggregations.... JSON-request with 5 nested levels is whatever, but not simple.
Unfortunately, I have no experience with SOLR, can't say anything about it.
But Sphinxsearch is much better it this scenario, becasue of totally back compatible SphinxQL.
Note:
Sphinxsearch/Manticore are indeed interesting. It's not Lucine based, and as result seriously different. Contain several unique features from the box which ES do not have and crazy fast with small/middle size indexes.
I have use Elasticsearch for 3 years and Solr for about a month, I feel elasticsearch cluster is quite easy to install as compared to Solr installation. Elasticsearch has a pool of help documents with great explanation. One of the use case I was stuck up with Histogram Aggregation which was available in ES however not found in Solr.
Add an nested document in solr very complex and nested data search also very complex. but Elastic Search easy to add nested document and search
I only use Elastic-search. Since I found solr is very hard to start.
Elastic-search's features:
Easy to start, very few setting. Even a newbie can setup a cluster step by step.
Simple Restful API which using NoSQL query. And many language libraries for easy accessing.
Good document, you can read the book: . There is a web version on official website.

log search using hadoop

We have huge log files(~ 100s of Gigs) on multiple web servers that are needed to be searched in real time. These log files are written multiple times/second by different apps. We have recently installed a hadoop cluster on some servers for this purpose. In order to implement search on these logs, I have thought of this design: there is a process running on web servers which creates an inverted-index of logs and cache it in-memory (on web servers itself) and push to HDFS via flume to be stored in Hive when the cache is full (this is much like an LRU cache). This helps in two ways when something is searched for: most recent logs are returned from in-memory cache and is fast and older logs are returned from disk. And since user wants to see latest logs first, this technique works. Can somebody verify if this design will work and scale properly. Are there any better alternatives around?
Thanks
You could store the inverted index in HBase to provide more real-time access to your older logs.
HBase would also likely be a viable alternative to your in-memory cache. You could do this if you wanted to unify the storage platform instead of having it split up. It will obviously be slower than memcached or redis.
A completely different approach could be using Lucene/Solr to index your logs. This has a lot of nice features out of the box for searching.

log4j Log Indexing using Solr

We are finding it very hard to monitor the logs spread over a cluster of four managed servers. So, I am trying to build a simple log4j appender which uses solrj api to store the logs in the solr server. The idea is to use leverage REST of solr to build a better GUI which could help us
search the logs and the display the previous and the next 50 lines or so and
tail the logs
Being awful on front ends, I am trying to cookup something with GWT (a prototype version). I am planning to host the project on googlecode under ASL.
Greatly appreciate if you could throw some insights on
Whether it makes sense to create a project like this ?
Is using Solr for this an overkill?
Any suggestions on web framework/tool which will help me build a tab-based front end for tailing.
You can use a combination of logstash (for shipping and filtering logs) + elasticsearch (for indexing and storage) + kibana (for a pretty GUI).
The loggly folks have also built logstash, which can be backed by quite a few things, including lucene via elastic search. It can forward to graylog also.
Totally doable thing. Many folks have done the roll your own. A couple of useful links.. there is an online service, www.loggly.com that does this. They are actually based on Solr as the core storage engine! Obviously they have built a proprietary interface.
Another option is http://www.graylog2.org/. It is opensource. Not backed by Solr, but still very cool!

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