The document discusses the architecture and performance challenges of a database system, focusing on scaling writes and maintaining API performance without increasing server numbers. It explores various storage engines such as InnoDB, Cassandra, and LevelDB, and addresses configuration settings for efficient data handling. Additionally, it outlines methods for sharding, clustering, and replication to optimize processing and improve write performance.

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2. CCM Escape Case Study
- Elastic Statistics Cluster
Damien Mangin, Nicolas Payart, Stéphane Varoqui
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3. ESCape Challenges
❏ Scale writes
❏ Should not hurt API performance
❏ Reduce the number of servers
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4. ESCape candidates
❏ Redis
Cluster is it ?(work in progress). Is it so fast for writes?
❏ Riak - LeveDB - InnoDB
Do I really need Erlang for this? To store billions of entries use Innostore.
InnoDB is a robust and well-known storage engine. Performance aside it
appears that LevelDB may become a preferred choice for Riak.
❏ Cassandra – Hbase
Do I really need Java for this? 10K insert per node group, is the price to
pay for hight level design. We don’t need eventualy consistancy? Read
performance will suffer from such design
❏ Syslogng & UDP
We do real time processing , what if database stopped
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5. MariaDB 10 my toolkit
❏ Storage Engines
InnoDB, Cassandra, Hbase, LevelDB, TokuDB,
Oqgraph
❏ Sharding, Clustering, and Federation
Spider, Multi source and Parallel replication,
Galera , Connect, federatedx, sphinx,
mroonga
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6. ESCape Architecture
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7. ESCape TokuDB
•
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TokuDB and MyISAM performance 3 times faster on 32G of memory on the most
demanding query
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8. ESCape Architecture
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9. ESCape Proxy Node Howto
CREATE TABLE shard01.kw (
ip INT unsigned NOT NULL,
date DATETIME shard02.kw (
CREATE TABLE NOT NULL,
firstseenon BINARY(255) NOT NULL,
ip INT unsigned NOT NULL,
keyword BINARY(128) NULL,
date DATETIME NOT NOT NULL,
domaine BINARY(128) NOT NULL, NULL,
firstseenon BINARY(255) NOT
referer BINARY(255) NOT NULL ,
keyword BINARY(128) NOT NULL,
crc64 BIGINT UNSIGNEDNULL,
c1 BINARY(128) NOT PRIMARY KEY
) ENGINE=blackhole;
c2 BINARY(255) NOT NULL ,
CREATE TABLE ccmkw (
ip INT unsigned NOT NULL,
date DATETIME NOT NULL,
firstseenon VARCHAR(255) NOT NULL,
keyword VARCHAR(128) NOT NULL,
c1 VARCHAR(128) NOT NULL,
c2 varchar(255) NOT NULL ,
crc64 BIGINT UNSIGNED PRIMARY KEY
crc64 BIGINT UNSIGNED AS (CONV(LEFT(MD5(
) ENGINE=blackhole;
IF(keyword='',CONCAT(firstseenon,c1),keyword)
) ,16),10,16)) PERSISTENT
) ENGINE=spider COMMENT='user "skysql",password "skyvodka"'
PARTITION BY LIST (mod(crc64,24))
(PARTITION pt01 VALUES IN (0) COMMENT = ' tbl
"3306", database "ccmstats_shard01"' ENGINE =
PARTITION pt02 VALUES IN (1) COMMENT = ' tbl
"3306", database "ccmstats_shard02"' ENGINE =
...
;
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"ccmkw", host
SPIDER,
"ccmkw", host
SPIDER,
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"127.0.0.1", port
"127.0.0.1", port
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10. ESCape Proxy Node Howto
default-storage-engine=MyISAM
skip-innodb
skip_name_resolv
back_log=1024
max_connections = 1024
table_open_cache = 4096
table_definition_cache = 2048
max_allowed_packet = 32K
binlog_cache_size = 32K
max_heap_table_size = 64M
thread_cache_size = 1024
query_cache_size = 0
expire_logs_days=4
progress_report_time=0
Binlog_ignore_db=ccmstats
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spider_use_handler=1
spider_sts_sync=0
spider_remote_sql_log_off=1
spider_remote_autocommit=0
spider_direct_dup_insert=1
spider_local_lock_table=0
spider_support_xa=0
spider_sync_autocommit=0
spider_sync_trx_isolation=0
spider_crd_sync=0
spider_conn_recycle_mode=1
spider_reset_sql_alloc=0
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11. ESCape Data Node Multi source Howto
MariaDB [(none)]> pager egrep
'Connection_name|Slave_IO_Running|Slave_SQL_Running|Gtid_Slave_Pos'
MariaDB [(none)]> show
Connection_name:
Slave_IO_Running:
Slave_SQL_Running:
Gtid_Slave_Pos:
Connection_name:
Slave_IO_Running:
Slave_SQL_Running:
Gtid_Slave_Pos:
Connection_name:
Slave_IO_Running:
Slave_SQL_Running:
Gtid_Slave_Pos:
Connection_name:
Slave_IO_Running:
Slave_SQL_Running:
Gtid_Slave_Pos:
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all slaves statusG
Yes
Yes
0-31091-138522330
ccmstats_gertrude
Yes
Yes
0-31091-138522330
ccmstats_lucifer
Yes
Yes
0-31091-138522330
ccmstats_mysql1
Yes
Yes
0-31091-138522330
Subset of shards per data node
SET GLOBAL ESCapeProxy1.
replicate_do_db='ccmstats_shard09,
Subset of shards per data node
ccmstats_shard10,ccmstats_shard11,
SET ccmstats_shard12,ccmstats_shard13,
GLOBAL ESCapeProxy1.
replicate_do_db='ccmstats_shard01,
ccmstats_shard14,ccmstats_shard15,
ccmstats_shard02,ccmstats_shard03,
ccmstats_shard16';
Subset of shards per data node
ccmstats_shard04,ccmstats_shard05,
SET GLOBAL ESCapeProxy1.
ccmstats_shard06,ccmstats_shard07,
replicate_do_db='ccmstats_shard01,
ccmstats_shard08';
ccmstats_shard02,ccmstats_shard03,
ccmstats_shard04,ccmstats_shard05,
ccmstats_shard22,ccmstats_shard23,
ccmstats_shard24;
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12. ESCape Data Node: I’m a dummy
Not counting multiple time from a single
IP.
DECLARE l_idUrl INT unsigned DEFAULT 0;
DECLARE i_idDom TINYINT unsigned DEFAULT 0;
DECLARE c_kw VARCHAR(128);
IF NOT EXISTS (SELECT 1 FROM ccmreferers
WHERE keyword = NEW.keyword AND ip = NEW.ip)
THEN
SET l_idUrl = ccmstats.GetIdUrl(NEW.firstseenon);
SET i_idDom = ccmstats.GetIdDomaine(NEW.domaine);
INSERT INTO stats_url_cur
SET keyword_crc64 = NEW.keyword_crc64,
DATE = NEW.date,
idUrl = l_idUrl,
idDomaine = i_idDom,
nb = 1
ON DUPLICATE KEY UPDATE nb=nb+1;
IF LENGTH(NEW.keyword) > 0 THEN
SET c_kw = REPLACE(TRIM(NEW.keyword),' ',' ');
INSERT INTO stats_url_kw_cur
SET keyword_crc64 = NEW.keyword_crc64,
DATE = NEW.date,
idUrl = l_idUrl,
keyword = c_kw,
idDomaine = i_idDom,
nb = 1
ON DUPLICATE KEY UPDATE nb=nb+1;
END IF;
END IF;
Massively DEADLOCKING
Trigger execution should never be re
entering to same table
Solution is a blacklist IP keyword table
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13. ESCape Benchmarks Writes
Write performance should never be an
issue full scalability with group commit
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14. ESCape Spider Open Resty and LibDrizzle
❏
Non blocking all the way
http {
include
mime.types;
default_type application/octet-stream;
sendfile
on;
keepalive_timeout 65;
upstream backend {
drizzle_server 192.168.0.30:5059 dbname=stat_shard01
password=skyvodka user=skysql protocol=mysql;
drizzle_keepalive max=100 mode=single overflow=reject;
}
server {
listen
81;
server_name localhost;
location / {
root
html;
index index.html index.htm;
}
location /referers {
set_unescape_uri $ip $arg_ip;
set_unescape_uri $date $arg_date;
set_unescape_uri $firstseenon $arg_firstseenon;set_quote_sql_str $quoted_firstseenon $firstseenon;
set_unescape_uri $keyword $arg_keyword;set_quote_sql_str $quoted_keyword $keyword;
set_unescape_uri $domaine $arg_domaine;set_quote_sql_str $quoted_domaine $domaine;
set_unescape_uri $ref $arg_ref;set_quote_sql_str $quoted_ref $ref;
set_unescape_uri $crc64 $arg_crc64;
❏
Fast as mysqlslap in C
❏
A gazillon faster vs ApachePHP
❏
Limited usage but scripting via lua
cosocket
❏
Non blocking MariaDB not in Resty
but should be faster
echo_location /mysql "INSERT INTO ref VALUES($ip,$date,$quoted_firstseenon,$quoted_keyword,$quoted_domaine,$quoted_ref,$crc64)";
location /mysql {
drizzle_pass backend;
drizzle_module_header off;
drizzle_query $query_string;
rds_json on;
}
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15. ESCape Benchmarks
Latency for 1000 Key Point Access
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16. ESCape Spider Direct SQL voodoo
HOW TO MAP REDUCE
CREATE TEMPORARY TABLE `res` (
`keyword_crc64` bigint(20) unsigned NOT NULL,
`date` date NOT NULL DEFAULT '0000-00-00',
`idUrl` int(10) unsigned NOT NULL,
`keyword` varchar(128) NOT NULL DEFAULT '',
`idDomaine` tinyint(3) unsigned NOT NULL DEFAULT '0',
`nb` mediumint(8) unsigned NOT NULL DEFAULT '0',
`id` bigint(20) unsigned NOT NULL DEFAULT '0'
) ENGINE=MEMORY DEFAULT CHARSET=latin1;
select spider_bg_direct_sql('SELECT * FROM stats_url_kw_cur s WHERE s.id IN
(241448386253908686)', 'res',
concat('host "', host, '", port "', port, '", user
"', username, '", password "', password, '", database "', tgt_db_name, '"')) a from
mysql.spider_tables where
db_name = 'commentcamarche' and table_name like 'stats_url_kw_cur#P#pt%’;
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17. ESCape Running non RC
Be prepared for beta testing
❏
❏
Have a compilation machine
❏
Learn about reproductible test
case
❏
Learn about Valgrind and mode
debug
❏
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Presente yourself and the
feature you would like to beta
test IRC on freenode #mariadb
Don’t get frustated if no answer it
is a dev channel
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18. ESCape Running non RC
10.0.4, Oups my InnoDB datetime are
broken after alter table
Fixed in 10.0.6
MySQL 5.5, it is NOT marked as
DATA_UNSIGNED despite it being treated by
the handler as HA_KEYTYPE_ULONGLONG.
This should perhaps be considered a bug in
InnoDB, but it is ancient history
Spider debug
mysqld --debug=S:T:t:r:p:n:L:i:F:f:D:d,info,error,query,
qcache,my,exit,general,where:O,/tmp/mysqld.trace
Having a compilation server
-DBUILD_CONFIG=mysql_release DCMAKE_BUILD_TYPE=Debug -DWITH_VALGRIND=ON
Replication Gotcha 10.0.6
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20. Thanks
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