Get Key Digest

[aerospike]

Get Key Digest

[GayathriKaliyamoorthy]

Currently digest based APIs are not supported. In the next release, we are planning to release the digest based APIs.

[GayathriKaliyamoorthy]

Hi,

With the latest release 1.0.26, you can retrieve the digest of a key when you do a client.get(key, callback). Please use the API and give us your feedback.

Thanks.

[prachaquant]

thank you :) I try it asap.

[prachaquant]

I've already try it. but there is some problem I get digest from put and I try to get the record using only digest

var aerospike = require("aerospike");
var client = aerospike.client(
{
    hosts: [
        {
            addr: "127.0.0.1",
            port: 3000
        }]
}).connect(function(err)
{
    if (err.code !== 0) console.log(err);
});

client.put(aerospike.key('test', 'test', '1'),{1: 1}, function(err, key)
{
    var digest = key.digest;
    console.log(digest);

    client.get(
    {
        ns: 'test',
        set: 'test',
        digest: digest
    }, function()
    {
        console.log(arguments);
    });
});

I got this error:

<Buffer 97 bd 2d 33 c6 2f e4 1c c8 39 b2 dd 98 0b d7 2d 12 b6 85 14>
Jan 13 2015 08:27:40 GMT: ERROR(30420) [get.cc:103] [prepare] - Parsing of key (C structure) from key object failed
{ '0': 
   { code: -2,
     message: 'AEROSPIKE_ERR_PARAM',
     func: null,
     file: '../src/main/client/get.cc',
     line: 104 },
  '1': null,
  '2': null,
  '3': null }

[GayathriKaliyamoorthy]

Hi,
You can retrieve a digest, but you cannot do any operations based on the digest.

1. The key object is a dictionary with entries, ns , set and key. So the entry digest is an invalid entry in the sample code above.
2. For any given key digest is calculated internally using the set value and the key value in the key object.
3. As we do not expose any digest based APIs, you cannot retrieve using the digest of the key.

If you need digest based APIs for your use case, please let us know, we will prioritize accordingly. And also, if you can explain your use case, we might be able to help you to design it our current API.

[prachaquant]

Digest based APIs might help me a lot. Right now I have a problem that I have to update Aerospike data using Unique ID.
Example:
When receive uid, look into DB find Aerospike key and update that record.
uid, aerospike key
id1, aerospike.key('ns','set','A1,B1,C1')
id2, aerospike.key('ns','set','A1,B1,C1')
id3, aerospike.key('ns','set','A1,B2,C1')
id4, aerospike.key('ns','set','A1,B2,C4')
id3, aerospike.key('ns','set','A1,B2,C3')

if no digest based API I need to store
id1, (A1,B1,C1)
id2, (A1,B1,C1)
....
in order to update target aerospike records

if there are digest based API,
id1, hash1
id2, hash1

which is more space saving because for me (A1,B1,C1) is a very long string