我编写了一个扩展FilterBase
并转换为JAR的Hbase自定义过滤器。过滤器如下所示:
public class MyFilter1 extends FilterBase implements Serializable{
boolean filterRow= true;
String srh;
public MyFilter1(String str) {
this.srh= str;
}
@Override
public ReturnCode filterKeyValue(Cell c) throws IOException {
String str= Bytes.toString(c.getValue());
if(str.contains(str)) {
filterRow= false;
return ReturnCode.INCLUDE;
}
filterRow= true;
return ReturnCode.SKIP;
}
@Override
public boolean filterRow() {
return filterRow;
}
@Override
public byte[] toByteArray() throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
ObjectOutputStream os = new ObjectOutputStream(out);
os.writeObject(this);
return out.toByteArray();
}
public static MyFilter1 parseFrom(final byte[] data) {
ByteArrayInputStream in = new ByteArrayInputStream(data);
MyFilter1 ans= null;
ObjectInputStream is;
try {
is = new ObjectInputStream(in);
ans= (MyFilter1)is.readObject();;
} catch (Exception e) {
e.printStackTrace();
}
return ans;
}
}
制作JAR文件(即MyFilter.jar)之后,我将它放在/ use / local / HBase / lib / filters目录中。然后我设置
export HBASE_CLASSPATH =“/ usr / local / Hbase / lib / filters / MyFilter.jar”
在hbase-env.sh中过滤并重新启动hbase服务器。然后我使用了java程序中的自定义过滤器:
public static void main(String argv[]) throws IOException {
Configuration conf= HBaseConfiguration.create();
Connection con= ConnectionFactory.createConnection(conf);
Table table= con.getTable(TableName.valueOf("stud"));
Filter fl= new MyFilter("uc");
Scan sc= new Scan();
sc.setFilter(fl);
ResultScanner rs= table.getScanner(sc);
for(Result r : rs)
System.out.println(Bytes.toString(r.getValue(Bytes.toBytes("perData"), Bytes.toBytes("name"))));
}
但是得到以下异常
Exception in thread "main" org.apache.hadoop.hbase.DoNotRetryIOException: org.apache.hadoop.hbase.DoNotRetryIOException: java.lang.reflect.InvocationTargetException
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.toFilter(ProtobufUtil.java:1478)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.toScan(ProtobufUtil.java:993)
at org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2396)
at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33648)
at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2180)
at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)
at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.toFilter(ProtobufUtil.java:1474)
... 8 more
Caused by: org.apache.hadoop.hbase.exceptions.DeserializationException: parseFrom called on base Filter, but should be called on derived type
at org.apache.hadoop.hbase.filter.Filter.parseFrom(Filter.java:270)
... 13 more
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:106)
at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:95)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRemoteException(ProtobufUtil.java:329)
at org.apache.hadoop.hbase.client.ScannerCallable.openScanner(ScannerCallable.java:408)
at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:204)
at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:65)
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:210)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:364)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:338)
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:136)
at org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:65)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.hadoop.hbase.ipc.RemoteWithExtrasException(org.apache.hadoop.hbase.DoNotRetryIOException): org.apache.hadoop.hbase.DoNotRetryIOException: java.lang.reflect.InvocationTargetException
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.toFilter(ProtobufUtil.java:1478)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.toScan(ProtobufUtil.java:993)
at org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2396)
at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33648)
at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2180)
at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)
at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.hadoop.hbase.protobuf.ProtobufUtil.toFilter(ProtobufUtil.java:1474)
... 8 more
Caused by: org.apache.hadoop.hbase.exceptions.DeserializationException: parseFrom called on base Filter, but should be called on derived type
at org.apache.hadoop.hbase.filter.Filter.parseFrom(Filter.java:270)
... 13 more
at org.apache.hadoop.hbase.ipc.RpcClientImpl.call(RpcClientImpl.java:1267)
at org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpcClient.java:227)
at org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementation.callBlockingMethod(AbstractRpcClient.java:336)
at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$BlockingStub.scan(ClientProtos.java:34094)
at org.apache.hadoop.hbase.client.ScannerCallable.openScanner(ScannerCallable.java:400)
... 10 more
任何人都可以帮助我...
答案 0 :(得分:1)
只需在上面的Abhishek Kumar的答案中添加一个(可能很重要的)细节。似乎序列化程序toByteArray()
和反序列化程序parseFrom(byte[] rawBytes)
必须通过Google协议缓冲区2实现。下面是一个示例实现。
AFilter.java
// whatever fields you need for the AFilter
long fieldA;
long fieldB;
/**
* Transform this {@code AFilter} instance to a byte array for serialization.
* @return raw bytes of this instance
*/
@Override
public byte[] toByteArray() {
final FilterProtos.AFilter.Builder builder = FilterProtos.AFilter.newBuilder();
builder.setFieldA(fieldA);
builder.setFieldB(fieldB);
return builder.build().toByteArray();
}
/**
* De-serialize {@code AFilter} from {@code rawBytes}.
*
* @param rawBytes raw bytes of the filter
* @return AFilter object
* @throws DeserializationException
*/
public static AFilter parseFrom(final byte[] rawBytes)
throws DeserializationException {
try {
FilterProtos.AFilter proto;
proto = FilterProtos.AFilter.parseFrom(rawBytes);
return new AFilter(proto.getFieldA(), proto.getFieldB());
} catch (InvalidProtocolBufferException ex) {
throw new DeserializationException(
ex);
}
}
Filters.proto
option java_package = "my.java.package";
option java_outer_classname = "FilterProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
option optimize_for = SPEED;
message AFilter{
required uint64 fieldA = 1;
required uint64 fieldB = 2;
}
答案 1 :(得分:0)
正如您在异常堆栈中看到的那样,它是由于在基过滤器上调用" parseFrom
引起的,但是应该在派生类型上调用"。
这意味着您还必须在自定义过滤器类中实现parseFrom
。
此外,您可能需要实施toByteArray
以及它们一起使用。