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https://issues.apache.org/jira/browse/NIFI-3205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867206#comment-15867206
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Joseph Witt commented on NIFI-3205:
-----------------------------------
[~markap14] please see attached template. In reviewing this PR i ran the
template and was left with a lot of content in the repo. It did eventually
clear out except a single file sitting in my content repository. I assume
there should be zero files left given I never created any content except in the
DebugFlow and it only ever rolled back its results.
Does this make sense?
> Uncaught Failures Can Leave New Flow Files on Disk
> --------------------------------------------------
>
> Key: NIFI-3205
> URL: https://issues.apache.org/jira/browse/NIFI-3205
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Alan Jackoway
> Assignee: Mark Payne
> Priority: Critical
> Fix For: 1.2.0
>
> Attachments: replicate_issue.xml
>
>
> We have been hitting a situation where our content repository quickly fills
> the entire disk despite having archiving off and close to nothing queued.
> We believe this problem happens more often when a processor that creates many
> flow files fails in the middle.
> I then created this test script and deployed it on a new nifi with a 100KB
> GenerateFlowFile in front of it. The script makes 5 copies of the incoming
> flow file, then does session.remove on those copies, then throws a
> RuntimeException. However, the content repository grows 500KB every time it
> runs. Then when you restart nifi, it cleans up the content repository with
> messages like this:
> {noformat}
> 2016-12-15 11:17:29,774 INFO [main] o.a.n.c.repository.FileSystemRepository
> Found unknown file
> /Users/alanj/nifi-1.1.0/content_repository/1/1481818525279-1 (1126400 bytes)
> in File System Repository; archiving file
> 2016-12-15 11:17:29,778 INFO [main] o.a.n.c.repository.FileSystemRepository
> Found unknown file
> /Users/alanj/nifi-1.1.0/content_repository/2/1481818585493-2 (409600 bytes)
> in File System Repository; archiving file
> {noformat}
> The test processor is the following:
> {code:java}
> // Copyright 2016 (c) Cloudera
> package com.cloudera.edh.nifi.processors.bundles;
> import com.google.common.collect.Lists;
> import java.io.IOException;
> import java.io.InputStream;
> import java.io.OutputStream;
> import java.util.List;
> import org.apache.nifi.annotation.behavior.InputRequirement;
> import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
> import org.apache.nifi.flowfile.FlowFile;
> import org.apache.nifi.processor.AbstractProcessor;
> import org.apache.nifi.processor.ProcessContext;
> import org.apache.nifi.processor.ProcessSession;
> import org.apache.nifi.processor.exception.ProcessException;
> import org.apache.nifi.processor.io.InputStreamCallback;
> import org.apache.nifi.processor.io.OutputStreamCallback;
> import org.apache.nifi.stream.io.StreamUtils;
> /**
> * Makes 5 copies of an incoming file, then fails and rolls back.
> */
> @InputRequirement(value = Requirement.INPUT_REQUIRED)
> public class CopyAndFail extends AbstractProcessor {
> @Override
> public void onTrigger(ProcessContext context, ProcessSession session)
> throws ProcessException {
> FlowFile inputFile = session.get();
> if (inputFile == null) {
> context.yield();
> return;
> }
> final List<FlowFile> newFiles = Lists.newArrayList();
>
> // Copy the file 5 times (simulates us opening a zip file and unpacking
> its contents)
> for (int i = 0; i < 5; i++) {
> session.read(inputFile, new InputStreamCallback() {
> @Override
> public void process(InputStream inputStream) throws IOException {
> FlowFile ff = session.create(inputFile);
> ff = session.write(ff, new OutputStreamCallback() {
> @Override
> public void process(final OutputStream out) throws IOException {
> StreamUtils.copy(inputStream, out);
> }
> });
> newFiles.add(ff);
> }
> });
> }
>
> getLogger().warn("Removing the new files");
> System.err.println("Removing the new files");
> session.remove(newFiles);
>
> // Simulate an error handling some file in the zip after unpacking the
> rest
> throw new RuntimeException();
> }
> }
> {code}
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