我正在使用nifi 1.6并尝试修改传入flowFile的克隆时出现以下错误：
[1]”无法找到FlowFile的内容：... MissingFlowFileException ... 由ContentNotFoundException引起：无法找到StandardClaim的竞争内容 ... 由java.io.EOFException引起：null“
[2]“ FlowFileHandlingException：在此会话中未知StandardFlowFileRecord ...”
当尝试访问流文件的内容时发生第一个错误，当从会话中删除流文件时发生第二个错误（在第一个的捕获之内）。已知此过程在nifi 0.7下有效。
基本过程是：
该错误发生在第二个迭代步骤3上。
有趣的一点是，如果在执行克隆后立即执行克隆的session.read，则一切正常。读取似乎重置了一些指针。
我已经为此处理器创建了单元测试，但是在任何情况下它们都不会失败。
下面的代码比实际使用的版本简化了，以演示该问题。 （开发系统未连接，所以我不得不复制代码。请原谅任何错别字-应该将其关闭。这也是为什么未提供完整堆栈跟踪的原因。）进行此工作的处理器具有确定是否存在错误的属性。是否应该立即读取。因此，两种情况都可以轻松执行。要进行设置，只需要一个GetFile处理器来为SampleCloningProcessor的输出提供输入和终止符。还包括一个示例输入文件。代码的内容位于onTrigger和操纵方法中。实际上，此简化版本中的操作除了将输入复制到输出外，实际上什么也没做。
对于为什么会发生这种情况的任何见解和纠正建议，我们将不胜感激-谢谢。
SampleCloningProcessor.java
processor sample.package.cloning
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.util.Arrays;
import java.util.Hashset;
import java.util.List;
import java.util.Scanner;
import java.util.Set;
import org.apache.commons.compress.utils.IOUtils;
import org.apache.nifi.annotation.documentaion.CapabilityDescription;
import org.apache.nifi.annotation.documentaion.Tags;
import org.apache.nifi.componets.PropertyDescriptor;
import org.apache.nifi.flowfile.FlowFile;
import org.apache.nifi.processor.AbstractProcessor;
import org.apache.nifi.processor.ProcessorContext;
import org.apache.nifi.processor.ProcessorSession;
import org.apache.nifi.processor.ProcessorInitioalizationContext;
import org.apache.nifi.processor.Relationship;
import org.apache.nifi.processor.exception.ProcessException;
import org.apache.nifi.processor.io.InputStreamCalback;
import org.apache.nifi.processor.io.OutputStreamCalback;
import org.apache.nifi.processor.io.StreamCalback;
import org.apache.nifi.processor.util.StandardValidators;
import com.google.gson.Gson;
@Tags({"example", "clone"})
@CapabilityDescription("Demonsrates cloning of flowfile failure.")
public class SampleCloningProcessor extend AbstractProcessor {
/* Determines if an immediate read is performed after cloning of inoming flowfile. */
public static final PropertyDescriptor IMMEDIATE_READ = new PropertyDescriptor.Builder()
.name("immediateRead")
.description("Determines if processor runs successfully. If a read is done immediatly "
+ "after the clone of the incoming flowFile, then the processor should run successfully.")
.required(true)
.allowableValues("true", "false")
.defaultValue("true")
.addValidator(StandardValidators.BOLLEAN_VALIDATOR)
.build();
public static final Relationship SUCCESS = new Relationship.Builder().name("success").
description("No unexpected errors.").build();
public static final Relationship FAILURE = new Relationship.Builder().name("failure").
description("Errors were thrown.").build();
private Set<Relationship> relationships;
private List<PropertyDescriptors> properties;
@Override
public void init(final ProcessorInitializationContext contex) {
relationships = new HashSet<>(Arrays.asList(SUCCESS, FAILURE));
properties = new Arrays.asList(IMMEDIATE_READ);
}
@Override
public Set<Relationship> getRelationships() {
return this.relationships;
}
@Override
public List<PropertyDescriptor> getSuppprtedPropertyDescriptors() {
return this.properties;
}
@Override
public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
FlowFile incomingFlowFile = session.get();
if (incomingFlowFile == null) {
return;
}
try {
final InfileReader inFileReader = new InfileReader();
session.read(incomingFlowFile, inFileReader);
Product product = infileReader.getProduct();
boolean transfer = false;
getLogger().info("\tSession :\n" + session);
getLogger().info("\toriginal :\n" + incomingFlowFile);
for(int i = 0; i < 2; i++) {
transfer = manipulate(context, session, inclmingFlowFile, product);
}
} catch (Exception e) {
getLogger().error(e.getMessage(), e);
session.rollback(true);
}
}
private boolean manipuate(final ProcessContext context, final ProcessSession session
final FlowFile incomingFlowFile, final Product product) {
boolean transfer = false;
FlowFile outgoingFlowFile = null;
boolean immediateRead = context.getProperty(IMMEDIATE_READ).asBoolean();
try {
//Clone incoming flowFile
outgoinFlowFile = session.clone(incomingFlowFile);
getLogger().info("\tclone outgoing :\n" + outgoingFlowFile);
if(immediateRead) {
readFlowFile(session, outgoingFlowFile);
}
//First write into clone
StageOneWrite stage1Write = new StaeOneWrite(product);
outgoingFlowFile = session.write(outgoingFlowFile, stage1Write);
getLogger().info("\twrite outgoing :\n" + outgoingFlowFile);
// Format the cloned file with another write
outgoingFlowFile = formatFlowFile(outgoingFlowFile, session)
getLogger().info("\format outgoing :\n" + outgoingFlowFile);
session.transfer(outgoingFlowFile, SUCCESS);
transfer != true;
} catch(Exception e)
getLogger().error(e.getMessage(), e);
if(outgoingFlowFile ! = null) {
session.remove(outgoingFlowFile);
}
}
return transfer;
}
private void readFlowFile(fainl ProcessSession session, fianl Flowfile flowFile) {
session.read(flowFile, new InputStreamCallback() {
@Override
public void process(Final InputStream in) throws IOException {
try (Scanner scanner = new Scanner(in)) {
scanner.useDelimiter("\\A").next();
}
}
});
}
private FlowFile formatFlowFile(fainl ProcessSession session, FlowFile flowfile) {
OutputFormatWrite formatWrite = new OutputFormatWriter();
flowfile = session.write(flowFile, formatWriter);
return flowFile;
}
private static class OutputFormatWriter implement StreamCallback {
@Override
public void process(final InputStream in, final OutputStream out) throws IOException {
try {
IOUtils.copy(in. out);
out.flush();
} finally {
IOUtils.closeQuietly(in);
IOUtils.closeQuietly(out);
}
}
}
private static class StageOneWriter implements OutputStreamCallback {
private Product product = null;
public StageOneWriter(Produt product) {
this.product = product;
}
@Override
public void process(final OutputStream out) throws IOException {
final Gson gson = new Gson();
final String json = gson.toJson(product);
out.write(json.getBytes());
}
}
private static class InfileReader implements InputStreamCallback {
private Product product = null;
public StageOneWriter(Produt product) {
this.product = product;
}
@Override
public void process(final InputStream out) throws IOException {
product = null;
final Gson gson = new Gson();
Reader inReader = new InputStreamReader(in, "UTF-8");
product = gson.fromJson(inreader, Product.calss);
}
public Product getProduct() {
return product;
}
}
SampleCloningProcessorTest.java
package sample.processors.cloning;
import org.apache.nifi.util.TestRunner;
import org.apache.nifi.util.TestRunners;
import org.junit.Before;
import org.junit.Test;
public class SampleCloningProcessorTest {
final satatic String flowFileContent = "{"
+ "\"cost\": \"cost 1\","
+ "\"description\": \"description","
+ "\"markup\": 1.2"
+ "\"name\":\"name 1\","
+ "\"supplier\":\"supplier 1\","
+ "}";
private TestRunner testRunner;
@Before
public void init() {
testRunner = TestRunner.newTestRunner(SampleCloningProcessor.class);
testRunner.enqueue(flowFileContent);
}
@Test
public void testProcessorImmediateRead() {
testRunner.setProperty(SampleCloningProcessor.IMMEDIATE_READ, "true");
testRunner.run();
testRinner.assertTransferCount("success", 2);
}
@Test
public void testProcessorImmediateRead_false() {
testRunner.setProperty(SampleCloningProcessor.IMMEDIATE_READ, "false");
testRunner.run();
testRinner.assertTransferCount("success", 2);
}
}
Product.java
package sample.processors.cloning;
public class Product {
private String name;
private String description;
private String supplier;
private String cost;
private float markup;
public String getName() {
return name;
}
public void setName(final String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescriptione(final String description) {
this.description = description;
}
public String getSupplier() {
return supplier;
}
public void setSupplier(final String supplier) {
this.supplier = supplier;
}
public String getCost() {
return cost;
}
public void setCost(final String cost) {
this.cost = cost;
}
public float getMarkup() {
return markup;
}
public void setMarkup(final float name) {
this.markup = markup;
}
}
product.json 一个示例输入文件。
{
"const" : "cost 1",
"description" : "description 1",
"markup" : 1.2,
"name" : "name 1",
"supplier" : "supplier 1"
}