mongodb mapreduce lock
You may output to a collection when performing map-reduce operations on the ..... post-processing step prevents MongoDB from locking the database: during ... ,Simple answer? Sometimes ... It depends a lot on how you are using map/reduce ... but in my experience it's never been a problem. There isn't much info on this, ...
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 mongodb mapreduce lock 相關參考資料
Map-Reduce Concurrency — MongoDB Manual
The map-reduce operation is composed of many tasks, including reads from the input collection, ... During the operation, map-reduce takes the following locks:. https://docs.mongodb.com db.collection.mapReduce() — MongoDB Manual
You may output to a collection when performing map-reduce operations on the ..... post-processing step prevents MongoDB from locking the database: during ... https://docs.mongodb.com Does MongoDB MapReduce lock the database - Stack Overflow
Simple answer? Sometimes ... It depends a lot on how you are using map/reduce ... but in my experience it's never been a problem. There isn't much info on this, ... https://stackoverflow.com MongoDB - How does locking work for Map Reduce? - Stack Overflow
MapReduce, if outputting to a collection will take multiple write locks out as it writes (as any operation which is creating/updating a collection would). If you are ... https://stackoverflow.com Map-Reduce performance in MongoDb 2.2, 2.4, and 2.6 - Stack Overflow
Here is the current state of functionality for Map/Reduce in MongoDB ... is a single global JavaScript lock, which only allows a single JavaScript thread to run at a ... https://stackoverflow.com Does an inline mapreduce on Mongo block? - Stack Overflow
In terms of the locking, the Map/Reduce job can be thought of as many ... First, there is a javascript lock so that only one thread can execute JS code at one point ... https://stackoverflow.com MongoDB Map-reduce 如何避免全局锁- 开源中国
MongoDB Map-Reduce 示例(replace,merge以及reduce) ... 没有指定nonAtomic: true设置时，MongoDB则需要全局写锁"Lock::GlobalWrite lock" https://www.oschina.net MongoDB Map-reduce How To Avoid Global Locks | Venu Anuganti ...
MongoDB Map-reduce How To Avoid Global Locks. April 5, 2014. Two important features that drives analytics in MongoDB are: Aggregation · Map-Reduce. http://venublog.com Possible to prevent global lock during map reduce? - MongoDB Jira
During the reduce phase of a map-reduce job I'm running, it seems the entire mongod process becomes locked. I believe the following output ... https://jira.mongodb.org |