Chana
Avro Data Store based on Akka (persistence in progressing)
This project is named from Chinese word 刹那, which is a transliteration of the word "Kasna" from Sanskrit, means "instant; split second".
Core Design
- Each record is an actor (non-blocking)
- Akka sharding cluster (easy to scale-out)
- Locate field/value via avpath
- Scripting triggered by field updating events (JDK 8 JavaScript engine - Nashorn)
- JPQL query on cluster (under heavy developing)
Run chana
$ sbt run
Or
$ sbt clean compile dist
$ ls target/universal/
tmp chana-0.2.0-SNAPSHOT.zip
Then, copy chana-0.2.0-SNAPSHOT.zip to somewhere and unzip it
$ cd chana-0.2.0-SNAPSHOT/bin
$ ./chana
Access chana
Example 1: Simple Record
Schema: PersonInfo.avsc
{
"type" : "record",
"name" : "PersonInfo",
"namespace" : "chana",
"fields" : [ {
"name" : "name",
"type" : "string"
}, {
"name" : "age",
"type" : "int"
}, {
"name" : "gender",
"type" : {
"type" : "enum",
"name" : "GenderType",
"symbols" : [ "Female", "Male", "Unknown" ]
},
"default" : "Unknown"
}, {
"name" : "emails",
"type" : {
"type" : "array",
"items" : "string"
}
} ]
}
Try it:
$ cd src/test/resources/avsc
$ curl --data @PersonInfo.avsc 'http://127.0.0.1:8080/putschema/personinfo'
OK
$ curl 'http://127.0.0.1:8080/personinfo/get/1'
{"name":"","age":0,"gender":"Unknown","emails":[]}
$ curl --data-binary @PersonInfo.update 'http://127.0.0.1:8080/personinfo/update/1'
OK
$ curl 'http://127.0.0.1:8080/personinfo/get/1'
{"name":"James Bond","age":60,"gender":"Unknown","emails":[]}
$ curl 'http://127.0.0.1:8080/personinfo/get/1/name'
"James Bond"
#### JPQL Simple test
$ echo 'SELECT COUNT(p.age), AVG(p.age), p.age FROM PersonInfo p WHERE p.age >= 30 ORDER BY p.age' | curl -d @- 'http://127.0.0.1:8080/putjpql/JPQL_NO_1'
#### watching jpql results
$ cat ./jpql.ask
while :
do
sleep 1s
curl 'http://127.0.0.1:8080/askjpql/JPQL_NO_1'
echo -e '\n'
done
$ ./jpql.ask
#### update record with random id (effected by ?benchmark_only=10240). Repeat it to update more person's age to 40
$ echo '{"age":40}' | curl -d @- 'http://127.0.0.1:8080/personinfo/put/1?benchmark_only=10240'
#### finally, a simple benchmark test
$ ab -c100 -n100000 -k 'http://127.0.0.1:8080/personinfo/get/1?benchmark_only=1024'
Script example: (requires JDK8+)
A piece of JavaScript code that will be executed when field PersionInfo.name was updated: on_name.js:
function onNameUpdated() {
var age = record.get("age");
what_is(age);
what_is(http_get);
var http_get_result = http_get.apply("http://localhost:8080/ping");
java.lang.Thread.sleep(1000);
what_is(http_get_result.value());
what_is(http_post);
var http_post_result = http_post.apply("http://localhost:8080/personinfo/put/2/age", "888");
java.lang.Thread.sleep(1000);
what_is(http_post_result.value());
for (i = 0; i < fields.length; i++) {
var field = fields[i];
what_is(field._1);
what_is(field._2);
}
}
function what_is(value) {
print(id + ": " + value);
}
onNameUpdated();
Try it:
$ curl --data-binary @on_name.js \
'http://127.0.0.1:8080/personinfo/putscript/name/SCRIPT_NO_1'
OK
$ curl --data '"John"' 'http://127.0.0.1:8080/personinfo/put/1/name'
OK
$ curl 'http://127.0.0.1:8080/personinfo/get/2/age'
888
Example 2: With Embedded Type
Schema: hatInventory.avsc
{
"type" : "record",
"name" : "hatInventory",
"namespace" : "chana",
"fields" : [ {
"name" : "sku",
"type" : "string",
"default" : ""
}, {
"name" : "description",
"type" : {
"type" : "record",
"name" : "hatInfo",
"fields" : [ {
"name" : "style",
"type" : "string",
"default" : ""
}, {
"name" : "size",
"type" : "string",
"default" : ""
}, {
"name" : "color",
"type" : "string",
"default" : ""
}, {
"name" : "material",
"type" : "string",
"default" : ""
} ]
},
"default" : { }
} ]
}
Try it:
$ cd src/test/resources/avsc
$ curl --data @hatInventory.avsc 'http://127.0.0.1:8080/putschema/hatinv'
OK
$ curl 'http://127.0.0.1:8080/hatinv/get/1'
{"sku":"","description":{"style":"","size":"","color":"","material":""}}
$ curl --data '{"style":"classic","size":"Large","color":"Red"}' \
'http://127.0.0.1:8080/hatinv/put/1/description'
OK
$ curl 'http://127.0.0.1:8080/hatinv/get/1'
{"sku":"","description":{"style":"classic","size":"Large","color":"Red","material":""}}
$ curl 'http://127.0.0.1:8080/hatinv/get/1/description'
{"style":"classic","size":"Large","color":"Red","material":""}
$ ab -c100 -n100000 -k 'http://127.0.0.1:8080/hatinv/get/1?benchmark_only=1024'
Simple benchmark for REST-JSON API (too simple too naive)
Environment:
HOST: Dell Inc. PowerEdge R420/0VD50G CPU: 2 x Intel(R) Xeon(R) CPU E5-2420 v2 @ 2.20GHz (12 #core, 24 #HT) OS: CentOS Linux release 7.0.1406 (Core)
Simple GET/PUT REST-JSON Result:
Simple GET: 169,437 [req#/sec] (mean) Simple PUT: 102,961 [req#/sec] (mean)
Details:
To run:
sbt run
cd src/test/resources/avsc
./bench-get.sh
./bench-put.sh
Preface
chana stores Avro record, with two groups of APIs:
- Primitive API (Scala/Java)
- RESTful API
Primitive API (Scala / Java)
use avpath expression to locate. see avpath
1. Schema
case class PutSchema(entityName: String, schema: String, entityFullName: Option[String], idleTimeout: Duration)
case class RemoveSchema(entityName: String)
2. Basic operations
case class GetRecord(id: String)
case class GetRecordAvro(id: String)
case class GetRecordJson(id: String)
case class PutRecord(id: String, record: Record)
case class PutRecordJson(id: String, record: String)
case class GetField(id: String, field: String)
case class GetFieldAvro(id: String, field: String)
case class GetFieldJson(id: String, field: String)
case class PutField(id: String, field: String, value: Any)
case class PutFieldJson(id: String, field: String, value: String)
case class Select(id: String, path: String)
case class SelectAvro(id: String, path: String)
case class SelectJson(id: String, path: String)
case class Update(id: String, path: String, value: Any)
case class UpdateJson(id: String, path: String, value: String)
3. Operations applicable on Array / Map
case class Insert(id: String, path: String, value: Any)
case class InsertJson(id: String, path: String, value: String)
case class InsertAll(id: String, path: String, values: List[_])
case class InsertAllJson(id: String, path: String, values: String)
case class Delete(id: String, path: String)
case class Clear(id: String, path: String)
4. Script
case class PutScript(entity: String, field: String, id: String, script: String)
case class RemoveScript(entity: String, field: String, id: String)
REST API
Put schema
POST /putschema/$entityName?fullname=entity_full_name&timeout=1000 Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: <SCHEMA_STRING>
parameters:
fullname
: for schema that contains multiple referenced complex types in union, you should provide the full name of main entry. Optionaltimeout
: idle timeout in milliseconds. Optional
Del schema
GET /delschema/$entityName/ Host: status.wandoujia.com
Get record
GET /$entity/get/$id/ Host: status.wandoujia.com
Get record field
GET /$entity/get/$id/$field Host: status.wandoujia.com
Put record
POST /$entity/put/$id/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: <JSON_STRING>
Put record field
POST /$entity/put/$id/$field Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: <JSON_STRING>
Select
POST /$entity/select/$id/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: $avpath
Update
POST /$entity/update/$id/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: $avpath <JSON_STRING>
Example (update array field -> record’s number field):
POST /account/update/12345/ BODY: .chargeRecords[0].time 1234
Example (update map field -> record’s number field):
POST /account/update/12345/ BODY: .devApps("a"|"b").numBlackApps 1234
Insert (applicable for Array / Map only)
POST /$entity/insert/$id/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: $avpath <JSON_STRING>
Example (insert to array field):
POST /account/insert/12345/ BODY: .chargeRecords {"time": 4, "amount": -4.0}
Example (insert to map field):
POST /account/insert/12345/ BODY: .devApps {"h" : {"numBlackApps": 10}}
InsertAll (applicable for Array / Map only)
POST /$entity/insertall/$id/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: $avpath <JSON_STRING>
Example (insert to array field):
POST /account/insertall/12345/ BODY: .chargeRecords [{"time": -1, "amount": -5.0}, {"time": -2, "amount": -6.0}]
Example (insert to map field):
POST /account/insertall/12345/ BODY: .devApps {"g" : {}, "h" : {"numBlackApps": 10}}
Delete (applicable for Array / Map only)
POST /$entity/delete/$id/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: $avpath
Clear (applicable for Array / Map only)
POST /$entity/clear/$id/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: $avpath
Put Script (apply on all instances of this entity)
POST /$entity/putscript/$field/$scriptid/ Host: status.wandoujia.com Content-Type: application/octet-stream Content-Length: NNN BODY: <JavaScript>
Del Script (apply on all instances of this entity)
GET /$entity/delscript/$field/$scriptid/ Host: status.wandoujia.com
Note:
- Replace
$entity
with the object/table/entity name - Replace
$id
with object id - Replace
$avpath
with actual avpath expression - Put the
$avpath
and JSON format value(s) for update / insert / insertall in POST body, separate$avpath
and JSON value(s) with \n, and make sure it’s encoded as binary, set Content-Type: application/octet-stream
Scripting supporting
The bindings that could be accessed in script:
def prepareBindings(onUpdated: OnUpdated) = {
val bindings = new SimpleBindings
bindings.put("http_get", http_get)
bindings.put("http_post", http_post)
bindings.put("id", onUpdated.id)
bindings.put("record", onUpdated.recordAfter)
bindings.put("fields", onUpdated.fieldsBefore)
bindings
}
Where,
http_get
: a function could be invoked viahttp_get.apply(url: CharSequence)
, returns scala.concurrent.Future[Any]http_post
: a function could be invoked viahttp_post.apply(url: CharSequence, body: CharSequence)
returns scala.concurrent.Future[Any]id
: the id of this entityrecord
: the entity record after updatedfields
: array of tuple (Schema.Field, valueBeforeUpdated) during this updating actionfields[i]._1
: org.apache.avro.Schema.Fieldfields[i]._2
: value- The JavaScript code should do what ever operation via function only. You can define local variables in function, and transfer these local vars between functions to share them instead of defining global vars.