简介

GoldenGate是一款可以实时投递数据到大数据平台的软件，针对apache cassandra，经过简单配置，即可实现从关系型数据将增量数据实时投递到Cassandra，以下介绍配置过程。

Cassandra安装

解压apache-cassandra-3.11.1-bin.tar.gz到 /opt/cassandra

sudo mkdir /var/lib/cassandra

sudo mkdir /var/log/cassandra

sudo chown hadoop /var/log/cassandra

sudo chown hadoop /var/lib/cassandra

启动 cassandra

/opt/cassandara/bin/Cassandra

查看状态

$ ./nodetool status

Datacenter: datacenter1

=======================

Status=Up/Down

|/ State=Normal/Leaving/Joining/Moving

-- Address Load Tokens Owns (effective) Host ID Rack

UN 127.0.0.1 92.1 KiB 256 100.0% e4f1431e-85ec-483a-a1b4-fe7bc8f7c9d2 rack1

进入Cassandra的shell

/opt/cassandara/bin/cqlsh

Connected to Test Cluster at 127.0.0.1:9042.

[cqlsh 5.0.1 | Cassandra 3.11.1 | CQL spec 3.4.4 | Native protocol v4]

Use HELP for help.

cqlsh>  SELECT cluster_name, listen_address FROM system.local;

 cluster_name | listen_address

--------------+----------------

 Test Cluster |      127.0.0.1

(1 rows)

查看系统空间

cqlsh> desc system.local;

CREATE TABLE system.local (

    key text PRIMARY KEY,

    bootstrapped text,

    broadcast_address inet,

    cluster_name text,

    cql_version text,

    data_center text,

    gossip_generation int,

    host_id uuid,

    listen_address inet,

    native_protocol_version text,

    partitioner text,

    rack text,

    release_version text,

    rpc_address inet,

    schema_version uuid,

    thrift_version text,

    tokens set<text>,

    truncated_at map<uuid, blob>

) WITH bloom_filter_fp_chance = 0.01

    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}

    AND comment = 'information about the local node'

    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}

    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}

    AND crc_check_chance = 1.0

    AND dclocal_read_repair_chance = 0.0

    AND default_time_to_live = 0

    AND gc_grace_seconds = 0

    AND max_index_interval = 2048

    AND memtable_flush_period_in_ms = 3600000

    AND min_index_interval = 128

    AND read_repair_chance = 0.0

AND speculative_retry = '99PERCENTILE';

查看有哪些keyspaces

cqlsh>describe keyspaces;

system_schema system_auth system system_distributed system_traces

创建后面OGG投递时schema对应的keyspaces

cqlsh>CREATE KEYSPACE QASOURCE WITH replication = {'class': 'SimpleStrategy', 'replication_factor' : 1};

创建测试表，验证一下cassandra的功能

Cqlsh>use qasource;

Cqlsh>create table test

(

id int ,

name varchar,

primary key(id)

);

插入几条记录

cqlsh:qasource> insert into test(id,name) values(1,'bck');

cqlsh:qasource> insert into test(id,name) values(2,'test');

cqlsh:qasource> select * from test;

id | name

----+------

1 | bck

2 | test

根据名称查询，由于无索引，会报错

cqlsh:qasource> select * from test where name='test';

InvalidRequest: Error from server: code=2200 [Invalid query] message="Cannot execute this query as it might involve data filtering and thus may have unpredictable performance. If you want to execute this query despite the performance unpredictability, use ALLOW FILTERING"

基于主键可正常查询

cqlsh:qasource> select * from test where id=2;

id | name

----+------

2 | test

(1 rows)

创建索引后可正常查询

cqlsh:qasource> create index idx_test on test(name);

cqlsh:qasource> select * from test where name='test';

id | name

----+------

2 | test

(1 rows)

如果更新，则需要指定key对应的WHERE条件

cqlsh:qasource> select * from test where id=2;

id | name

----+-------

2 | newly

(1 rows)

删除记录

cqlsh:qasource> delete from test where id=2;

cqlsh:qasource> select * from test ;

id | name

----+------

1 | bck

(1 rows)

OGG配置

解压cassandra3.1.2 java driver到/u01/drivers/cassandra-java-driver-3.1.2

设置OGG for bigdata需要的环境变量

export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64/server

配置replicat进程

REPLICAT rcass -- Trail file for this example is located in "AdapterExamples/trail" directory -- Command to add REPLICAT -- add replicat rcass, exttrail AdapterExamples/trail/tr TARGETDB LIBFILE libggjava.so SET property=dirprm/cass.props REPORTCOUNT EVERY 1 MINUTES, RATE GROUPTRANSOPS 1000 MAP QASOURCE.*, TARGET QASOURCE.*;

添加投递进程，使用OGG软件中自带的队列文件

GGSCI>add replicat rcass, exttrail AdapterExamples/trail/tr

投递到cassandra需要的属性文件 cass.props

gg.handlerlist=cassandra #The handler properties gg.handler.cassandra.type=cassandra gg.handler.cassandra.mode=op gg.handler.cassandra.contactPoints=localhost gg.handler.cassandra.ddlHandling=CREATE,ADD,DROP gg.handler.cassandra.compressedUpdates=true gg.handler.cassandra.cassandraMode=async gg.handler.cassandra.consistencyLevel=ONE goldengate.userexit.timestamp=utc goldengate.userexit.writers=javawriter javawriter.stats.display=TRUE javawriter.stats.full=TRUE gg.log=log4j gg.log.level=INFO gg.report.time=30sec #Set the classpath here to the Datastax Cassandra Java Driver (3.1 latest) #Link to the Cassandra drivers website #http://cassandra.apache.org/doc/latest/getting_started/drivers.html#java #Link to the Datastax Cassandra Java Driver #https://github.com/datastax/java-driver gg.classpath=/opt/cassandra-java-driver-3.1.2/*:/opt/cassandra-java-driver-3.1.2/lib/* javawriter.bootoptions=-Xmx512m -Xms32m -Djava.class.path=.:ggjava/ggjava.jar:./dirprm

测试

启动ogg replicat 进程

GGSCI (ol73) 12> start rcass

Sending START request to MANAGER ...

REPLICAT RCASS starting

查看状态

GGSCI (ol73) 13> info rcass

REPLICAT RCASS Last Started 2017-12-25 11:29 Status STARTING

Checkpoint Lag 00:00:00 (updated 02:56:41 ago)

Process ID 100794

Log Read Checkpoint File /u01/ogg4bd_12.3/AdapterExamples/trail/tr000000000

First Record RBA 0

GGSCI (ol73) 14> info rcass

REPLICAT RCASS Last Started 2017-12-25 11:30 Status RUNNING

Checkpoint Lag 00:00:00 (updated 00:00:00 ago)

Process ID 100794

Log Read Checkpoint File /u01/ogg4bd_12.3/AdapterExamples/trail/tr000000000

2015-11-06 02:45:39.000000 RBA 5660

已经正常启动，并写入数据。

统计写入的数据

GGSCI (ol73) 15> stats rcass, total

Sending STATS request to REPLICAT RCASS ... Start of Statistics at 2017-12-25 11:31:12. Replicating from QASOURCE.TCUSTMER to QASOURCE.TCUSTMER: *** Total statistics since 2017-12-25 11:30:43 *** Total inserts 5.00 Total updates 1.00 Total deletes 0.00 Total discards 0.00 Total operations 6.00 Replicating from QASOURCE.TCUSTORD to QASOURCE.TCUSTORD: *** Total statistics since 2017-12-25 11:30:43 *** Total inserts 5.00 Total updates 3.00 Total deletes 2.00 Total discards 0.00 Total operations 10.00 End of Statistics.

同步成功。

进入cassandra shell进行验证

./cqlsh

cqlsh> desc qasource;

CREATE KEYSPACE qasource WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'} AND durable_writes = true; CREATE TABLE qasource.tcustord ( cust_code text, order_date text, product_code text, order_id double, product_amount bigint, product_price double, transaction_id double, PRIMARY KEY (cust_code, order_date, product_code, order_id) ) WITH CLUSTERING ORDER BY (order_date ASC, product_code ASC, order_id ASC) AND bloom_filter_fp_chance = 0.01 AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'} AND comment = '' AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'} AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'} AND crc_check_chance = 1.0 AND dclocal_read_repair_chance = 0.1 AND default_time_to_live = 0 AND gc_grace_seconds = 864000 AND max_index_interval = 2048 AND memtable_flush_period_in_ms = 0 AND min_index_interval = 128 AND read_repair_chance = 0.0 AND speculative_retry = '99PERCENTILE'; CREATE TABLE qasource.tcustmer ( cust_code text PRIMARY KEY, city text, name text, state text ) WITH bloom_filter_fp_chance = 0.01 AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'} AND comment = '' AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'} AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'} AND crc_check_chance = 1.0 AND dclocal_read_repair_chance = 0.1 AND default_time_to_live = 0 AND gc_grace_seconds = 864000 AND max_index_interval = 2048 AND memtable_flush_period_in_ms = 0 AND min_index_interval = 128 AND read_repair_chance = 0.0 AND speculative_retry = '99PERCENTILE';

可以看到，已经增加了2张表到qasource keyspace中。

在cassandra中查询OGG写入的数据

cqlsh>use QASOURCE

cqlsh>desc keyspace QASOURCE;

查看表定义

cqlsh>desc table qasource.tcustmer;

cqlsh:qasource> desc table qasource.tcustmer;

CREATE TABLE qasource.tcustmer ( cust_code text PRIMARY KEY, city text, name text, state text ) WITH bloom_filter_fp_chance = 0.01 AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'} AND comment = '' AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'} AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'} AND crc_check_chance = 1.0 AND dclocal_read_repair_chance = 0.1 AND default_time_to_live = 0 AND gc_grace_seconds = 864000 AND max_index_interval = 2048 AND memtable_flush_period_in_ms = 0 AND min_index_interval = 128 AND read_repair_chance = 0.0 AND speculative_retry = '99PERCENTILE';

查询数据

cqlsh>select * from qasource.tcustmer ;

cust_code | city | name | state -----------+-------------+--------------------+------- WILL | SEATTLE | BG SOFTWARE CO. | WA JANE | DENVER | ROCKY FLYER INC. | CO ANN | NEW YORK | ANN'S BOATS | NY DAVE | TALLAHASSEE | DAVE'S PLANES INC. | FL BILL | DENVER | BILL'S USED CARS | CO (5 rows)

cqlsh:qasource> select * from qasource.tcustmer where cust_code='WILL';

cust_code | city | name | state

-----------+---------+-----------------+-------

WILL | SEATTLE | BG SOFTWARE CO. | WA

(1 rows)

cqlsh:qasource> select * from qasource.tcustord;

cust_code | order_date | product_code | order_id | product_amount | product_price | transaction_id -----------+---------------------+--------------+----------+----------------+---------------+---------------- WILL | 1994-09-30 15:33:00 | CAR | 144 | 3 | 16520 | 100 BILL | 1995-12-31 15:00:00 | CAR | 765 | 3 | 14000 | 100 BILL | 1996-01-01 00:00:00 | TRUCK | 333 | 15 | 25000 | 100 (3 rows)

可以正常访问数据，测试完成。