Aerospike: how do I get record key?

Question

Aerospike client has scanAll method for reading all rows from it's store. I use it in the folowing code: ``` ScanPolicy policy = new ScanPolicy(); policy.concurrentNodes = true; policy.priority = Priority.DEFAULT; policy.includeBinData = true; policy.scanPercent = 100; client.scanAll(policy, "namespaceName", "setName", new ScanCallback() { @Override public void scanCallback(Key key, Record record) throws AerospikeException { STORE.put(key.userKey.toLong(), record.getValue("binName").toString()); } }); ``` But it is finished with `NullPointerException`, because userKey is null. All other fields are valid as expected. User key is the Long value, that was used for saving data: ``` client.put(writePolicy, new Key("namespaceName", "setName", userKey), new Bin("binName", value)); ``` All is fine, if I do single request like this: ``` client.get(readPolicy, new Key("namespaceName", "setName", userKey)); ``` What may be wrong? Why userKey is null?

Accepted Answer

Aerospike uses key and set name to generate unique digest, So it stores only digest.

While inserting one record if you set `writePolicy.sendKey = true` then key will be stored as metadata of record. If one record is inserted with `writePolicy.sendKey = true` then only you will get key in scanCallback().

By default writePolicy.sendKey is false, so by default `scanCallback()` gets null as key. Thats why your `key.userKey.toLong()` gives NullPointerException.

Aerospike: how do I get record key?

Solution

Problem