如何从 aerospike 命名空间获取所有键，就像我可以使用 map.keyset 从 Map 中获取键 . 我浏览了这个链接Aerospike: how do I get record key? . 我做了答案中被告知的事情 . 我用 writePolicy.sendKey = true 编写了代码，但是当我在 scanCallback 功能中显示密钥时，我仍然得到 NULL .
这是我写一条记录的代码（任何帮助将不胜感激）
def writeToAerospike(): Boolean = {
val host:Host = new Host("xx.xxx.xxx.xx", 3000)
val client = new AerospikeClient(new ClientPolicy,host)
val policy = new WritePolicy();
policy.sendKey = true;
policy.timeout = 50000;
if(client.isConnected()){
println("connection to aerospike client sucessful")
client.put(policy,new Key("test", "testSet", "1"),new Bin("name", "john"))
//verify if the record is entered correctly
println(client.get(policy,new Key("test", "testing", "1")).getValue("name"))
client.close()
return true
}
return false
}
我正在使用此示例中的代码来扫描记录：http://www.aerospike.com/docs/client/java/usage/scan/scan.html
class ScanParallelTest extends ScanCallback {
private var recordCount: Int = _
def runTest() {
val client = new AerospikeClient("xxx.xx.xxx.xx", 3000)
try {
val policy = new ScanPolicy()
policy.concurrentNodes = true
policy.priority = Priority.LOW
policy.includeBinData = true
client.scanAll(policy, "test", "testSet", this)
println("Records " + recordCount)
} finally {
client.close()
}
}
def scanCallback(key: Key, record: Record) {
recordCount += 1
println("Records " + recordCount )
println ("key=" + " "+key.userKey.toString() +" and "+" record: "+" "+ record.bins)
}
}
这是我得到的错误：
com.aerospike.client.AerospikeException: java.lang.NullPointerException
at com.aerospike.client.command.ScanExecutor.scanParallel(ScanExecutor.java:66)
at com.aerospike.client.AerospikeClient.scanAll(AerospikeClient.java:551)
at aerospike.asd.ScanParallelTest.runTest(ScanParallelTest.scala:23)
at aerospike.asd.test$.main(test.scala:10)
at aerospike.asd.test.main(test.scala)
Caused by: java.lang.NullPointerException
at aerospike.asd.ScanParallelTest.scanCallback(ScanParallelTest.scala:35)
at com.aerospike.client.command.ScanCommand.parseRecordResults(ScanCommand.java:122)
at com.aerospike.client.command.MultiCommand.parseResult(MultiCommand.java:58)
at com.aerospike.client.command.SyncCommand.execute(SyncCommand.java:56)
at com.aerospike.client.command.ScanExecutor$ScanThread.run(ScanExecutor.java:134)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
2 回答
我尝试使用
client.readPolicyDefault.sendKey = true;和client.scanPolicyDefault.sendKey = true;与client.writePolicyDefault.sendKey = true;，代码开始返回原始键而不是NULL .以下是
helipilot50的工作代码链接：https://github.com/helipilot50/store-primary-key这对我的情况很有帮助 . 谢谢！
加上法赫德的回答：
请记住，存储密钥（而不仅仅是摘要）会占用空间 . 如果key是100个字符的字符串，并且您的记录是两个8字节整数，则密钥存储将使用比这两个值更多的空间 .
使用这些知识是为了好，而不是为了邪恶:)