BRS Commands – Cli
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BRS Commands
Queries for BRS using cli
BRS is short form for BangDB Resource Server. BRS is for dealing with large files or objects, where the file / object size could go from few KBs to several GBs. BRS allows users to create buckets and then put the files or objects in these buckets. There are two default buckets that BangDB creates when it creates a db, namely "ml_bucket_info" and "udf_bucket_info". These are for storing ML related files and user defined functions respectively. We can interact with BRS using the commands from cli as follows.
Create buckets
bangdb> create bucket mybucket
bucket [ mybucket ] created
To see the buckets in the db
bangdb> show buckets
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|key |val |
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|mybucket |{"bucket_name":"mybucket","access_key":"brs_access_key","secret_key":"secret_key", |
| |"num_objects":" 0","create_time":1611991680677004,"ttl":0,"_pk":"mybucket","_v":1} |
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|ml_bucket_info |{"bucket_name":"ml_bucket_info","access_key":"brs_access_key","secret_key":"brs_secret_key", |
| |"ttl":604800,"num_objects":" 0","create_time":1611919352456474,"_pk":"ml_bucket_info","_v":1} |
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|bangdb_udf_bucket |{"bucket_name":"bangdb_udf_bucket","access_key":"brs_access_key","secret_key": |
| |"brs_secret_key","ttl":604800,"num_objects":" 0","create_time":1611919352512129," |
| |_pk":"bangdb_udf_bucket","_v":1} |
+-----------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
To put file in the buckets
Let's say we wish to upload a file name abc.txt, present at /home/sachin/Documents Size of the file is around 17MBbangdb> putfile /home/sachin/Documents/abc.txt into mybucket where filekey = "abc_file_key"
successfully put the file
Show the files in the bucket
bangdb> show from mybucket
{
"total_keys" : 1,
"key_list" : [
{
"key" : "abc_file_key:0:17:17254154:1612102871582854"
}
]
}
success
The file is stored in BRS in slices and if we read the key returned by the command "show from mybucket", we will see that the file has been sliced into 17 parts and stored in the db. When we retrieve the file, db combines all these slices and returns the entire file
To get the file from the BRS
Here we call the getfile command for the given file key and store the retrieved file at "/home/sachin/Document/xyz.txt"bangdb> getfile /home/sachin/Documents/xyz.txt from mybucket where filekey = "abc_file_key"
success in getting the file
To count the number of items in the bucket
bangdb> count from mybucket
total num of files = 1
To delete the file
bangdb> delfile from mybucket where filekey = "abc_file_key"
file deleted successfully
To drop the bucket
bangdb> drop bucket mybucket
do you wish to delete the bucket and all its files? [ yes | no ]: yes
bucket [ mybucket ] successfully dropped