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Merge pull request #5816 from edx/usman/plat71-mongo-autoreconnect-errors-2

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Proxy to retry on mongo Autoreconnect errors.
This commit is contained in:
Usman Khalid
2014-11-10 19:56:11 +05:00
parent 6df676b9b8 5fa1104787
commit 96b1a17b66
5 changed files with 58 additions and 69 deletions
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63
common/lib/xmodule/xmodule/modulestore/mongo/base.py
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@@ -20,34 +20,37 @@ import re
from uuid import uuid4
from bson.son import SON
from fs.osfs import OSFS
from path import path
from contracts import contract, new_contract
from datetime import datetime
from fs.osfs import OSFS
from mongodb_proxy import MongoProxy, autoretry_read
from path import path
from pytz import UTC
from contracts import contract, new_contract
from operator import itemgetter
from sortedcontainers import SortedListWithKey
from importlib import import_module
from xmodule.errortracker import null_error_tracker, exc_info_to_str
from xmodule.mako_module import MakoDescriptorSystem
from xmodule.error_module import ErrorDescriptor
from xblock.runtime import KvsFieldData
from xblock.exceptions import InvalidScopeError
from xblock.fields import Scope, ScopeIds, Reference, ReferenceList, ReferenceValueDict
from xmodule.modulestore import ModuleStoreWriteBase, ModuleStoreEnum, BulkOperationsMixin, BulkOpsRecord
from xmodule.modulestore.draft_and_published import ModuleStoreDraftAndPublished, DIRECT_ONLY_CATEGORIES
from opaque_keys.edx.keys import UsageKey, CourseKey, AssetKey
from opaque_keys.edx.locations import Location
from xmodule.modulestore.exceptions import ItemNotFoundError, DuplicateCourseError, ReferentialIntegrityError
from xmodule.modulestore.inheritance import InheritanceMixin, inherit_metadata, InheritanceKeyValueStore
from xblock.core import XBlock
from opaque_keys.edx.locations import SlashSeparatedCourseKey
from opaque_keys.edx.locator import CourseLocator
from opaque_keys.edx.keys import UsageKey, CourseKey, AssetKey
from xmodule.exceptions import HeartbeatFailure
from xmodule.modulestore.edit_info import EditInfoRuntimeMixin
from xblock.core import XBlock
from xblock.exceptions import InvalidScopeError
from xblock.fields import Scope, ScopeIds, Reference, ReferenceList, ReferenceValueDict
from xblock.runtime import KvsFieldData
from xmodule.assetstore import AssetMetadata
from xmodule.error_module import ErrorDescriptor
from xmodule.errortracker import null_error_tracker, exc_info_to_str
from xmodule.exceptions import HeartbeatFailure
from xmodule.mako_module import MakoDescriptorSystem
from xmodule.modulestore import ModuleStoreWriteBase, ModuleStoreEnum, BulkOperationsMixin, BulkOpsRecord
from xmodule.modulestore.draft_and_published import ModuleStoreDraftAndPublished, DIRECT_ONLY_CATEGORIES
from xmodule.modulestore.edit_info import EditInfoRuntimeMixin
from xmodule.modulestore.exceptions import ItemNotFoundError, DuplicateCourseError, ReferentialIntegrityError
from xmodule.modulestore.inheritance import InheritanceMixin, inherit_metadata, InheritanceKeyValueStore
log = logging.getLogger(__name__)
@@ -442,6 +445,7 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
error_tracker=null_error_tracker,
i18n_service=None,
fs_service=None,
retry_wait_time=0.1,
**kwargs):
"""
:param doc_store_config: must have a host, db, and collection entries. Other common entries: port, tz_aware.
@@ -455,15 +459,18 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
"""
Create & open the connection, authenticate, and provide pointers to the collection
"""
self.database = pymongo.database.Database(
pymongo.MongoClient(
host=host,
port=port,
tz_aware=tz_aware,
document_class=dict,
**kwargs
self.database = MongoProxy(
pymongo.database.Database(
pymongo.MongoClient(
host=host,
port=port,
tz_aware=tz_aware,
document_class=dict,
**kwargs
),
db
),
db
wait_time=retry_wait_time
)
self.collection = self.database[collection]
@@ -516,9 +523,10 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
super(MongoModuleStore, self)._drop_database()
connection = self.collection.database.connection
connection.drop_database(self.collection.database)
connection.drop_database(self.collection.database.proxied_object)
connection.close()
@autoretry_read()
def fill_in_run(self, course_key):
"""
In mongo some course_keys are used without runs. This helper function returns
@@ -692,6 +700,7 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
item['location'] = item['_id']
del item['_id']
@autoretry_read()
def _query_children_for_cache_children(self, course_key, items):
"""
Generate a pymongo in query for finding the items and return the payloads
@@ -796,6 +805,7 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
for item in items
]
@autoretry_read()
def get_courses(self, **kwargs):
'''
Returns a list of course descriptors.
@@ -927,6 +937,7 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
for key in ('tag', 'org', 'course', 'category', 'name', 'revision')
])
@autoretry_read()
def get_items(
self,
course_id,

52
common/lib/xmodule/xmodule/modulestore/split_mongo/mongo_connection.py
View File

@@ -2,6 +2,7 @@
Segregation of pymongo functions from the data modeling mechanisms for split modulestore.
"""
import re
from mongodb_proxy import autoretry_read, MongoProxy
import pymongo
import time
@@ -68,50 +69,28 @@ def structure_to_mongo(structure):
return new_structure
def autoretry_read(wait=0.1, retries=5):
"""
Automatically retry a read-only method in the case of a pymongo
AutoReconnect exception.
See http://emptysqua.re/blog/save-the-monkey-reliably-writing-to-mongodb/
for a discussion of this technique.
"""
def decorate(fn):
@wraps(fn)
def wrapper(*args, **kwargs):
for attempt in xrange(retries):
try:
return fn(*args, **kwargs)
break
except AutoReconnect:
# Reraise if we failed on our last attempt
if attempt == retries - 1:
raise
if wait:
time.sleep(wait)
return wrapper
return decorate
class MongoConnection(object):
"""
Segregation of pymongo functions from the data modeling mechanisms for split modulestore.
"""
def __init__(
self, db, collection, host, port=27017, tz_aware=True, user=None, password=None, asset_collection=None, **kwargs
self, db, collection, host, port=27017, tz_aware=True, user=None, password=None,
asset_collection=None, retry_wait_time=0.1, **kwargs
):
"""
Create & open the connection, authenticate, and provide pointers to the collections
"""
self.database = pymongo.database.Database(
pymongo.MongoClient(
host=host,
port=port,
tz_aware=tz_aware,
**kwargs
self.database = MongoProxy(
pymongo.database.Database(
pymongo.MongoClient(
host=host,
port=port,
tz_aware=tz_aware,
**kwargs
),
db
),
db
wait_time=retry_wait_time
)
# Remove when adding official Split support for asset metadata storage.
@@ -142,7 +121,6 @@ class MongoConnection(object):
else:
raise HeartbeatFailure("Can't connect to {}".format(self.database.name))
@autoretry_read()
def get_structure(self, key):
"""
Get the structure from the persistence mechanism whose id is the given key
@@ -195,7 +173,6 @@ class MongoConnection(object):
"""
self.structures.insert(structure_to_mongo(structure))
@autoretry_read()
def get_course_index(self, key, ignore_case=False):
"""
Get the course_index from the persistence mechanism whose id is the given key
@@ -212,7 +189,6 @@ class MongoConnection(object):
}
return self.course_index.find_one(query)
@autoretry_read()
def find_matching_course_indexes(self, branch=None, search_targets=None):
"""
Find the course_index matching particular conditions.
@@ -271,14 +247,12 @@ class MongoConnection(object):
'run': course_index['run'],
})
@autoretry_read()
def get_definition(self, key):
"""
Get the definition from the persistence mechanism whose id is the given key
"""
return self.definitions.find_one({'_id': key})
@autoretry_read()
def get_definitions(self, definitions):
"""
Retrieve all definitions listed in `definitions`.

3
common/lib/xmodule/xmodule/modulestore/split_mongo/split.py
View File

@@ -56,6 +56,7 @@ import datetime
import logging
from contracts import contract, new_contract
from importlib import import_module
from mongodb_proxy import autoretry_read
from path import path
from pytz import UTC
from bson.objectid import ObjectId
@@ -775,6 +776,7 @@ class SplitMongoModuleStore(SplitBulkWriteMixin, ModuleStoreWriteBase):
# add it in the envelope for the structure.
return CourseEnvelope(course_key.replace(version_guid=version_guid), entry)
@autoretry_read()
def get_courses(self, branch, **kwargs):
'''
Returns a list of course descriptors matching any given qualifiers.
@@ -2631,6 +2633,7 @@ class SplitMongoModuleStore(SplitBulkWriteMixin, ModuleStoreWriteBase):
"""
structure['blocks'][block_key] = content
@autoretry_read()
def find_courses_by_search_target(self, field_name, field_value):
"""
Find all the courses which cached that they have the given field with the given value.

8
common/lib/xmodule/xmodule/modulestore/tests/test_split_w_old_mongo.py
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@@ -70,9 +70,9 @@ class SplitWMongoCourseBoostrapper(unittest.TestCase):
Remove the test collections, close the db connection
"""
split_db = self.split_mongo.db
split_db.drop_collection(split_db.course_index)
split_db.drop_collection(split_db.structures)
split_db.drop_collection(split_db.definitions)
split_db.drop_collection(split_db.course_index.proxied_object)
split_db.drop_collection(split_db.structures.proxied_object)
split_db.drop_collection(split_db.definitions.proxied_object)
def tear_down_mongo(self):
"""
@@ -80,7 +80,7 @@ class SplitWMongoCourseBoostrapper(unittest.TestCase):
"""
split_db = self.split_mongo.db
# old_mongo doesn't give a db attr, but all of the dbs are the same
split_db.drop_collection(self.draft_mongo.collection)
split_db.drop_collection(self.draft_mongo.collection.proxied_object)
def _create_item(self, category, name, data, metadata, parent_category, parent_name, draft=True, split=True):
"""

1
requirements/edx/github.txt
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@@ -11,6 +11,7 @@
-e git+https://github.com/edx/django-pipeline.git@88ec8a011e481918fdc9d2682d4017c835acd8be#egg=django-pipeline
-e git+https://github.com/edx/django-wiki.git@cd0b2b31997afccde519fe5b3365e61a9edb143f#egg=django-wiki
-e git+https://github.com/edx/django-oauth2-provider.git@0.2.7-fork-edx-2#egg=django-oauth2-provider
-e git+https://github.com/edx/MongoDBProxy.git@efe14679c9263ab491916ed960f5930127e05faf#egg=mongodb_proxy
-e git+https://github.com/gabrielfalcao/lettuce.git@cccc3978ad2df82a78b6f9648fe2e9baddd22f88#egg=lettuce
-e git+https://github.com/dementrock/pystache_custom.git@776973740bdaad83a3b029f96e415a7d1e8bec2f#egg=pystache_custom-dev
-e git+https://github.com/eventbrite/zendesk.git@d53fe0e81b623f084e91776bcf6369f8b7b63879#egg=zendesk