Hedis

Hedis stands for "Hyper Redis". It can retrieve data from ANY database directly and stores to itself.

What is Hedis?

Traditionally, application server retrieves hot data from in-memory database (like Redis) to reduce unnecessary paths. If in-memory database doesn't have specific data, application server gets back to retrieve data from original database.

Hedis can retrieve data from ANY database directly. Application server retrieves hot data from Hedis server, If Hedis server doesn't have specific data, Hedis retrieves data from original database via ANY connector.

Benchmark

Latency (lower is better)

Requests (higher is better)

Hedis configuration file

cdh1: # connector name (REQUIRED)
  type: hbase # connector type (REQUIRED)
  zookeeper: localhost:2181 # other configuration (depends on its type)
  env: # environment variables (OPTIONAL)
    CLASSPATH: $CLASSPATH:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/async-1.4.0.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/asynchbase-1.5.0-libhbase-20140311.193218-1.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/commons-configuration-1.6.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/commons-lang-2.5.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/commons-logging-1.1.1.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/hadoop-core-1.0.4.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/hbase-0.94.17.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/libhbase-1.0-SNAPSHOT.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/log4j-1.2.17.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/netty-3.8.0.Final.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/protobuf-java-2.5.0.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/slf4j-api-1.7.5.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/slf4j-log4j12-1.7.5.jar:/home/kewang/git/libhbase/target/libhbase-1.0-SNAPSHOT/lib/zookeeper-3.4.5.jar
    HBASE_LIB_DIR: /home/kewang/hbase/lib
    HBASE_CONF_DIR: /home/kewang/hbase/conf
    LD_LIBRARY_PATH: $LD_LIBRARY_PATH:/usr/lib/jvm/java-7-oracle/jre/lib/amd64/server
mysqltest:
  type: mysql
  username: root
  password: MY_PASSWORD
  host: localhost
  database: hedistest
  env:
    LD_LIBRARY_PATH: $LD_LIBRARY_PATH:/usr/lib/x86_64-linux-gnu
otherdb:
  type: gooddb

Connectors

• hedis-connector-template
• hedis-connector-hbase
• hedis-connector-mysql

How to make

Before you make the hedis, please clean the dependencies first in order to rebuild dependencies. "make" does not rebuild dependencies automatically, even if something in the source code of dependencies is changes.

make distclean

After clean the dependencies, build the hedis using "make" command.

make

How to run

redis-server --hedis hedis.yml

Commands

GET

GET [CONNECTOR-NAME]://(INVALIDATE-SIGN)[CONNECTOR-COMMAND]

Example

# HBase example:
#
# get "kewang" rowkey at "user" table on "cdh1" connector
GET "cdh1://user@kewang"

# HBase example:
#
# get "kewang" rowkey at "user" table on "cdh1" connector, again
GET "cdh1://!user@kewang"

# MySQL example:
#
# Query one record at "user" table on "mysqltest" connector
GET "mysqltest://select * from user limit 1"

SCAN, and so on.

TODO

Related with Redis

This is a modified version of Redis, maintaining by Kewang now.