Java – aerospike: how to get the record key?

The aerospike client has a scanall method to read all rows in its store

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());
    }
});

However, since the userkey is null, the NullPointerException completes All other fields are valid as expected The user key is a long value used to save data:

client.put(writePolicy,new Key("namespaceName",userKey),new Bin("binName",value));

Everything is fine. If I do this, single request:

client.get(readPolicy,userKey));

What might be wrong? Why is the userkey empty?

Solution

Aerospike uses keys and set names to generate unique summaries, so it only stores summaries

If writepolicy. Is set Sendkey = true, insert a record, and the key will be stored as the metadata of the record If you use writepolicy Sendkey = true inserts a record, then the keyword can only be obtained in scancallback()

By default, writepolicy Sendkey is false, so scancallback() will be null by default That's why your key userKey. Tolong() gives NullPointerException