git bisect can turn out to be very useful when you want to find a bug in a series of commits. It uses binary search to search through commits and helps you find out where a bug was introduced. Lets take a look at an example. Say you have a file called controller.py, and you […]
Writing unit/integration tests for your search code ? If this includes creating an index and adding some data for your tests, the wait_for_status flag might be useful. The API looks like this: http://localhost:9200/health?wait_for_status=green&timeout=50s This is a blocking call and will wait till the timeout provided till the status changes. This will definitely be more helpful than sleeping […]
Elasticsearch’s cluster API is a good 30,000 ft high description of your cluster health. If you have Elasticsearch installed on your local machine, give this a try: http://localhost:9200/_cluster/health You output might look something like this: { “cluster_name”: “elasticsearch”, “status”: “yellow”, “timed_out”: false, “number_of_nodes”: 1, “number_of_data_nodes”: 1, “active_primary_shards”: 5, “active_shards”: 5, “relocating_shards”: 0, “initializing_shards”: 0, […]
There is typing I do on my PyCharm which are repetitive. An example of this is adding a breakpoint. I use ipdb to debug and I always need to type in this when I need to add a breakpoint: from ipdb import set_trace; set_trace() To avoid this, you can always use PyCharm’s macros to record the typing and […]
Navigating though code in PyCharm is easy. All you would need is this: But there is a hidden open-everything shortcut which might just save your day. Hit shift twice and this is what you’ll see: This window shows you classes, files and symbols. Its a lot easier than using a shortcut for each type !
You can close an active index in Elasticsearch. Deleting an index removes the entire index and you can never recover it. Closing an index, on the other hand, lets you revive the index on-demand. Closing an index removes the index from memory, but saves it into disk. The cluster overhead it incurs is pretty minimal as […]
The _source field is an predefined field which ES (elasticsearch) manages. It contains the entire document, just as it was sent for indexing. Here is an example of what you get back when you search on ES: As you see here, the default behavior (where _source is enabled) is that ES gives you back the […]
Todays unix flavors come with more than a kind of shell you can run your program with. While executing a shell script, the kernel has to know which one of these needs to be used to execute your script. The first line pretty much says that. Is used to tell the kernel that this script […]
/dev/null is a special file in unix. It is also called the ‘Bit Bucket’. Data sent to the /dev/null is as good as sending data to a black hole. But why would you ever want to send data to a black hole ? Here’s an example of why you might use it : Lets say […]
Today was a special evening. Had the amazing honor to listen to Neil Degrasse Tyson at the Orpheum Theatre in San Francisco. The talk was all about how we stopped innovating in the space arena and how the cold war was the most important reason we got to where we got to 50 years ago. Thats him reading the […]
sharath ravindran 