Elasticsearch延迟存储并立即搜索

Question

我在用 弹性搜索用python。并dsl在python中使用驱动程序。

我的脚本如下。

import time
from elasticsearch_dsl import DocType, String
from elasticsearch import exceptions as es_exceptions
from elasticsearch_dsl.connections import connections

ELASTICSEARCH_INDEX = 'test'

class StudentDoc(DocType):
    student_id = String(required=True)
    tags = String(null_value=[])

    class Meta:
        index = ELASTICSEARCH_INDEX

    def save(self, **kwargs):
        '''
        Override to set metadata id
        '''
        self.meta.id = self.student_id
        return super(StudentDoc, self).save(**kwargs)

# Define a default Elasticsearch client
connections.create_connection(hosts=['localhost:9200'])

# create the mappings in elasticsearch
StudentDoc.init()

student_doc_obj = \
    StudentDoc(
        student_id=str(1),
        tags=['test'])

try:
    student_doc_obj.save()
except es_exceptions.SerializationError as ex:
    # catch both exception raise by elasticsearch
    LOGGER.error('Error while creating elasticsearch data')
    LOGGER.exception(ex)
else:
    print "*"*80
    print "Student Created:", student_doc_obj
    print "*"*80


search_docs = \
    StudentDoc \
    .search().query('ids',
                    values=["1"])
try:
     student_docs = search_docs.execute()
except es_exceptions.NotFoundError as ex:
    LOGGER.error('Unable to get data from elasticsearch')
    LOGGER.exception(ex)
else:
    print "$"*80
    print student_docs
    print "$"*80

time.sleep(2)

search_docs = \
    StudentDoc \
    .search().query('ids',
                    values=["1"])
try:
     student_docs = search_docs.execute()
except es_exceptions.NotFoundError as ex:
    LOGGER.error('Unable to get data from elasticsearch')
    LOGGER.exception(ex)
else:
    print "$"*80
    print student_docs
    print "$"*80

在此脚本中，我正在创建，StudentDoc并在创建时尝试访问相同的文档。记录下来empty时我会得到回应search。

输出值

********************************************************************************
Student Created: {'student_id': '1', 'tags': ['test']}
********************************************************************************
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
<Response: []>
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
<Response: [{u'student_id': u'1', u'tags': [u'test']}]>
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

save命令执行并存储数据，然后为什么search不返回tat数据。经过2第二睡眠，它返回的数据。:(

尝试与curl命令相同，输出相同。

echo "Create Data"
curl http://localhost:9200/test/student_doc/2 -X PUT -d '{"student_id": "2", "tags": ["test"]}' -H 'Content-type: application/json'

echo
echo "Search ID"
curl http://localhost:9200/test/student_doc/_search -X POST -d '{"query": {"ids": {"values": ["2"]}}}' -H 'Content-type: application/json'
echo

在将数据存储到Elasticsearch时是否有延迟？

Answer 1

是的，一旦您为新文档建立索引，该索引将在刷新索引后才可用。不过，您有几个选择，主要是。

答：您可以refresh将test使用底层的连接只是保存后的索引student_doc_obj和搜索之前：

connections.get_connection.indices.refresh(index= ELASTICSEARCH_INDEX)

B.您可以get直接搜索文档而不是搜索文档，因为a get是完全实时的，不需要等待刷新：

student_docs = StudentDoc.get("1")

同样，使用curl，您只需在refresh查询中添加查询字符串参数

echo "Create Data"
curl 'http://localhost:9200/test/student_doc/2?refresh=true' -X PUT -d '{"student_id": "2", "tags": ["test"]}' -H 'Content-type: application/json'

或者，您也可以通过id简单地获取文档

echo "GET ID"
curl -XGET http://localhost:9200/test/student_doc/2