PramodBisht

Here is a sample multi-provider Vagrantfile that can use either VirtualBox or Docker as a provider with vagrant:

$touch Vagrantfile

#Copy and paste Vagrantfile into newly created file

PramodBisht

Elasticsearch: updating the mappings and settings of an existing index

Note: This was written using elasticsearch 0.9.

Elasticsearch will automatically create an index (with basic settings and mappings) for you if you post a first document:

$ curl -X POST 'http://localhost:9200/thegame/weapons/1' -d \
'{
  "_id": 1,

PramodBisht

/* Useful celery config.

app = Celery('tasks',
             broker='redis://localhost:6379',
             backend='redis://localhost:6379')

app.conf.update(
    CELERY_TASK_RESULT_EXPIRES=3600,
    CELERY_QUEUES=(
        Queue('default', routing_key='tasks.#'),

PramodBisht

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

PramodBisht

#!/usr/bin/env python
# marc-w.com
# Built and tested on Django 1.5

class BulkInsertManager(models.Manager):
    
    def _bulk_insert_ignore(self, create_fields, values, print_sql=False):
        '''
        Bulk insert/ignore
        @param create_fields : list, required, fields for the insert field declaration