ElasticSearch基于version进行乐观锁并发控制
Posted ql211lin
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一、基于version进行乐观锁并发控制
1)、查看一条document
GET /test_version/test_version_type/1
{ "_index" : "test_version", "_type" : "test_version_type", "_id" : "1", "_version" : 1, "found" : true, "_source" : { "test_field" : "test test" } }
2)、模拟多并发下,利用version进行更新
同时带上数据的版本号,确保说,es中的数据的版本号,跟客户端中的数据的版本号是相同的,才能修改
PUT /test_version/test_version_type/1?version=1 { "test_field": "test client 1" } { "_index" : "test_version", "_type" : "test_version_type", "_id" : "1", "_version" : 2, "result" : "updated", "_shards" : { "total" : 2, "successful" : 1, "failed" : 0 }, "_seq_no" : 1, "_primary_term" : 1 }
PUT /test_version/test_version_type/1?version=1 { "test_field": "test client 2" } { "error": { "root_cause": [ { "type": "version_conflict_engine_exception", "reason": "[test_version_type][1]: version conflict, current version [2] is different than the one provided [1]", "index_uuid": "VT8uFhvTS_qawAksysahtQ", "shard": "3", "index": "test_version" } ], "type": "version_conflict_engine_exception", "reason": "[test_version_type][1]: version conflict, current version [2] is different than the one provided [1]", "index_uuid": "VT8uFhvTS_qawAksysahtQ", "shard": "3", "index": "test_version" }, "status": 409 }
二、基于external version进行乐观锁并发控制
es提供了一个feature,就是说,你可以不用它提供的内部_version版本号来进行并发控制,可以基于你自己维护的一个版本号来进行并发控制。
1)、查看一条document
GET /test_version/test_version_type/2 { "_index" : "test_version", "_type" : "test_version_type", "_id" : "2", "_version" : 1, "found" : true, "_source" : { "test_field" : "test" } }
2)、语法与区别
?version=1
?version=1&version_type=external
version_type=external,唯一的区别在于,_version,只有当你提供的version与es中的_version一模一样的时候,才可以进行修改,只要不一样,就报错;当version_type=external的时候,只有当你提供的version比es中的_version大的时候,才能完成修改
3)、模拟多并发下,利用version进行更新
PUT /test_version/test_version_type/3?version=2&version_type=external { "test_field": "test client 1" } { "_index" : "test_version", "_type" : "test_version_type", "_id" : "3", "_version" : 2, "result" : "updated", "_shards" : { "total" : 2, "successful" : 1, "failed" : 0 }, "_seq_no" : 1, "_primary_term" : 1 }
PUT /test_version/test_version_type/3?version=2&version_type=external { "test_field": "test client 2" } { "error": { "root_cause": [ { "type": "version_conflict_engine_exception", "reason": "[test_version_type][3]: version conflict, current version [2] is higher or equal to the one provided [2]", "index_uuid": "VT8uFhvTS_qawAksysahtQ", "shard": "4", "index": "test_version" } ], "type": "version_conflict_engine_exception", "reason": "[test_version_type][3]: version conflict, current version [2] is higher or equal to the one provided [2]", "index_uuid": "VT8uFhvTS_qawAksysahtQ", "shard": "4", "index": "test_version" }, "status": 409 }
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