cassandra tuning

(i) the role of gossipThe Cassandra Cluster has no central node and each node has the same status, and they maintain the state of the cluster through a protocol called gossip.By gossip, each node knows which nodes are in the cluster and the state of those nodes, which makes it possible for any node in the Cassandra Cluster to route any key, and any node that is unavailable will not have disastrous consequen

In NoSQL's heyday today, a variety of nosql products are blossoming, but each product has its own characteristics, there are advantages and not suitable for the scene. In this paper, the characteristics of cassandra,mongodb,couchdb,redis,riak and HBase are analyzed in many aspects, I hope you will have a better understanding of the characteristics of these nosql products after reading this article. CouchDB written In:erlang Main p

The Cassandra data model differs greatly from the model of a relational database: relational Database model: Data is stored in tables, data is followed by a paradigm to reduce redundancy, and tables are connected through foreign keys Cassandra Model: In Cassandra, the application data is present in the keyspace, which corresponds to the schema in the relati

(i) the role of gossipThe Cassandra Cluster does not have a central node, and each node is in exactly the same position, and they maintain the state of the cluster through a protocol called gossip.With gossip, each node can know which nodes are included in the cluster, and the state of those nodes, which allows any node in the Cassandra Cluster to route any key, and any node that is unavailable will have no

When crawling and storing web pages using nutch2.0 + cassandra1.0, we found that all Chinese Characters in GBK-encoded web pages are garbled during parsing and extracting text. It's strange that Chinese garbled characters have never been detected in the past in nutch1.x, because the crawler code used by nutch1.x and nutch2.x is almost the same, I guess it may be a problem when it is saved to Cassandra. After reading the source code of saving the webpa

Through the above 2 sections, we have learned about the problems encountered by RDBMS and have a basic understanding of Cassandra. The following is an introduction to the Cassandra internal simple structure.Through this chapter, you should understand: Cassandra Write Process What is sstable Cassandra R

CassandraThe data model is based on the column family (Column Family) of four or five-dimensional models. It lendsThat's it.Amazonof theDynamoand theGoogle ' sBig Table's data structure and functional characteristics, usingmemtablestored in the same way. InCassandrabefore writing the data, you need to record the log(Commitlog), and then the data begins to write toColumn Familycorresponding to thememtablein whichmemtableis a kind of according toKeyThe memory structure of the sorted data, when cer

1, Cassandra PreparationStart Cqlsh,cqlsh_host=172.16.163.131 Bin/cqlshCqlsh>create keyspace productlogs with REPLICATION = {' class ': ' Org.apache.cassandra.locator.SimpleStrategy ', ' Replication_factor ': ' 2 ' } cqlsh>CREATE TABLE productlogs.logs ( IDs uuid, app_name text, App_version text, city text, client_time timestamp, country text, created_at timestamp, int , device_id text ,int, modle_name text, Provin

Cassandra version:apache-cassandra-2.1.3Os:ubuntu 14.10Enter Cassandra Command line$./cassandra-cliView node Status$./nodetool StatusDatacenter:datacenter1=======================Status=up/down|/state=normal/leaving/joining/moving--Address Load Tokens owns Host ID RackUN 127.0.0.1 71.23 KB 256? 61129023-a5c0-4331-98ce-7

Using Thrift to allow PHP to operate Cassandra is undoubtedly a preferred solution, but configuration and operations are troublesome. We can use a php module phpcassa to operate Cassandra. Let's insert some data first: Download phpcassa: github.comdownloadshoanphpcassaphpcassa-0.1.zip extract, put it in the project Using Thrift to allow PHP to operate Cassandra

Overview of the Gossip protocolNodes in the Cassandra cluster do not have primary and secondary points, and they communicate through a protocol called gossip. Through the gossip protocol, they can know what nodes are in the cluster and how they are state. Each gossip message has a version number on it, the nodes can compare to the received messages to see which messages I need to update, what messages I have and others don't, and then talk to each oth

Cassandra 2.0 database forJava local client visit Cassandra, first establish javaproject, use MAVEN to manage.Introduce dependencies:1. Like Elasticsearch, the client now constructs a cluster object:Cluster Cluster = Cluster.builder () . Addcontactpoint ("Your IP") . Build (); Metadata Metadata = Cluster.getmetadata (); System.out.printf ("Connected to cluster:%s\