Django Haystack 更新索引更快

Question

我使用 Django Haystack 已经有一段时间了，它很棒！我有一个相当繁重的网站，其中的数据需要不时更新（15 到 30 分钟）。

使用python manage.py update_index 时，更新数据需要很长时间。有没有办法加快这个速度？或者，如果可能，可能只更新更改的数据..

我目前正在使用 Django Haystack 1.2.7 和 Solr 作为后端和 Django 1.4。

谢谢！！！

---

编辑：

是的，我已经尝试阅读文档的那一部分，但我真正需要的是一种加快索引速度的方法。也许只更新最近的数据而不是全部更新。我找到了get_updated_field，但不知道如何使用它。在文档中只提到了使用它的原因，但没有显示实际示例。

---

编辑 2：

start = DateTimeField(model_attr='start', null=True, faceted=True, --HERE?--)

---

编辑 3：

好的，我已经实现了下面的解决方案，但是当我尝试重建索引（包含 45000 个数据）时，它几乎让我的计算机崩溃了。等待10分钟后出现错误：

 File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 443, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/haystack/management/commands/rebuild_index.py", line 16, in handle
    call_command('update_index', **options)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 150, in call_command
    return klass.execute(*args, **defaults)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/haystack/management/commands/update_index.py", line 193, in handle
    return super(Command, self).handle(*apps, **options)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 304, in handle
    app_output = self.handle_app(app, **options)
  File "/usr/local/lib/python2.7/dist-packages/haystack/management/commands/update_index.py", line 229, in handle_app
    do_update(index, qs, start, end, total, self.verbosity)
  File "/usr/local/lib/python2.7/dist-packages/haystack/management/commands/update_index.py", line 109, in do_update
    index.backend.update(index, current_qs)
  File "/usr/local/lib/python2.7/dist-packages/haystack/backends/solr_backend.py", line 73, in update
    self.conn.add(docs, commit=commit, boost=index.get_field_weights())
  File "/usr/local/lib/python2.7/dist-packages/pysolr.py", line 686, in add
    m = ET.tostring(message, encoding='utf-8')
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1127, in tostring
    ElementTree(element).write(file, encoding, method=method)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 821, in write
    serialize(write, self._root, encoding, qnames, namespaces)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 940, in _serialize_xml
    _serialize_xml(write, e, encoding, qnames, None)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 940, in _serialize_xml
    _serialize_xml(write, e, encoding, qnames, None)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 915, in _serialize_xml
    write("<" + tag)
MemoryError

Answer 1

get_updated_field 应返回一个字符串，该字符串包含模型上的属性名称，其中包含模型更新的日期 (haystack docs)。具有 auto_now=True 的 DateField 将是理想的选择 (Django docs)。

例如，我的 UserProfile 模型有一个名为 updated 的字段

models.py

class UserProfile(models.Model):
    user = models.ForeignKey(User)
    # lots of other fields snipped
    updated = models.DateTimeField(auto_now=True)

search_indexes.py

class UserProfileIndex(SearchIndex):
    text = CharField(document=True, use_template=True)
    user = CharField(model_attr='user')
    user_fullname = CharField(model_attr='user__get_full_name')

    def get_model(self):
        return UserProfile

    def get_updated_field(self):
        return "updated"

然后，当我运行 ./manage.py update_index --age=10 时，它只会索引过去 10 小时内更新的用户配置文件。