sharding

Using the following query when I create the collection I set two shards for the collection10 . /solr/admin/collections?action=CREATE&name=collection10&numShards=2&replicationFactor=2 But what is my requirement is, I have to add 3rd shard dynamically after 10000 documents has been indexed in first two shards. Is it possible to add shards dynamically once we started the collection and indexing at existing shards? If it possible means how to add shards dynamically once after we started the collection? And also, is it possible to add replicas dynamically once we started the collection.For example

I'm trying a simple Hibernate shard example (Yes, odd, 3.0.0.Beta2 released 4 years ago) using Hibernate Core 4.1.7 and Spring 3.1.2 and hit this issue during session factory initialization: Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in class path resource [shardedspring-config.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.hibernate.SessionFactory it.sella.lab.crm.sys.persistence.ShardedSessionFactoryBuilder

I am new to Cassandra was going though this Article explaining sharding and replication and I am stuck at a point that is - I have a cluster with 6 Cassandra nodes configured at my local machine. I create a new keyspace "TestKeySpace" with replication factor as 6 and a table in keyspace "employee" and primary key is auto-increment-number named RID. I am not able to understand how this data will be partitioned and replicated. What I want to know is since I am keeping my replication factor to be 6, and data will be distributed on multiple nodes, then will each node will be having exactly same

I know there is a ShardingTest() object that can be used to create a testing sharding environment (see https://serverfault.com/questions/590576/installing-multiple-mongodb-versions-on-the-same-server ), eg: mongo --nodb cluster = new ShardingTest({shards : 3, rs : false}) However, given that the disk space in my testing machine is limited and I'm getting "Insufficient free space for journal files" errors when using the above command, I'd like to set the smallfiles option. I have tried with the following with no luck: cluster = new ShardingTest({shards : 3, rs : false, smallfiles: true}) How

I'm going to be very specific here, because similar questions have been asked, but none of the solutions work for this problem. I'm working on a project that has four postgres databases, but let's say for the sake of simplicity there are 2. Namely, A & B A,B represent two geographical locations, but the tables and schemas in the database are identical. Sample model: from flask_sqlalchemy import SQLAlchemy from sqlalchemy import * from sqlalchemy.ext.declarative import declarative_base db = SQLAlchemy() Base = declarative_base() class FRARecord(Base): __tablename__ = 'tb_fra_credentials' recnr

I have a collection "documentDev" present in the database with sharding key as 'dNumber' Sample Document : { "_id" : "12831221wadaee23", "dNumber" : "115", "processed": false } If I try to update this document through any query tool using a command like - db.documentDev.update({ "_id" : ObjectId("12831221wadaee23"), "dNumber":"115" },{ $set:{"processed": true}}, { multi: false, upsert: false} )}` It updates the document properly. But if I do use spring boot's mongorepository command like DocumentRepo.save(Object) it throws an exception Caused by: com.mongodb.MongoCommandException: Command

I'm trying to shard my database on django, but I've got strange error on a first steps. I made a simple db router, that dous nothing: '''file /myproject/myapp/routers.py''' class ShardingRouter(object): def db_for_read(self, model, **hints): return 'default' def db_for_write(self, model, **hints): return 'default' def allow_relation(self, obj1, obj2, **hints): return 'default' def allow_syncdb(self, db, model): return 'default' I added in settings.py: DATABASE_ROUTERS = ['myproject.myapp.routers.ShardingRouter',] I'm getting this error: Traceback (most recent call last): File "/usr/local/lib