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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5432) Want a memory format for PCAP files
Date Tue, 23 May 2017 21:21:04 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16021888#comment-16021888
] 

ASF GitHub Bot commented on DRILL-5432:
---------------------------------------

Github user parthchandra commented on a diff in the pull request:

    https://github.com/apache/drill/pull/831#discussion_r118098082
  
    --- Diff: exec/java-exec/src/test/java/org/apache/drill/exec/store/pcap/TestPcapDecoder.java
---
    @@ -0,0 +1,230 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to you under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + * <p>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p>
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.drill.exec.store.pcap;
    +
    +import com.google.common.io.Resources;
    +import org.apache.drill.BaseTestQuery;
    +import org.apache.drill.exec.store.pcap.decoder.Packet;
    +import org.apache.drill.exec.store.pcap.decoder.PacketDecoder;
    +import org.junit.BeforeClass;
    +import org.junit.Test;
    +
    +import java.io.BufferedInputStream;
    +import java.io.DataOutputStream;
    +import java.io.File;
    +import java.io.FileInputStream;
    +import java.io.FileOutputStream;
    +import java.io.IOException;
    +import java.io.InputStream;
    +
    +import static org.junit.Assert.assertEquals;
    +import static org.junit.Assert.assertTrue;
    +
    +public class TestPcapDecoder extends BaseTestQuery {
    +  private static File bigFile;
    +
    +  /**
    +   * Creates an ephemeral file of about a GB in size
    +   *
    +   * @throws IOException If input file can't be read or output can't be written.
    +   */
    +  @BeforeClass
    +  public static void buildBigTcpFile() throws IOException {
    +    bigFile = File.createTempFile("tcp", ".pcap");
    +    bigFile.deleteOnExit();
    +    boolean first = true;
    +    System.out.printf("Building large test file\n");
    +    try (DataOutputStream out = new DataOutputStream(new FileOutputStream(bigFile)))
{
    +      for (int i = 0; i < 1000e6 / (29208 - 24) + 1; i++) {
    +        // might be faster to keep this open and rewind each time, but
    +        // that is hard to do with a resource, especially if it comes
    +        // from the class path instead of files.
    +        try (InputStream in = Resources.getResource("store/pcap/tcp-2.pcap").openStream())
{
    +          ConcatPcap.copy(first, in, out);
    +        }
    +        first = false;
    +      }
    +      System.out.printf("Created file is %.1f MB\n", bigFile.length() / 1e6);
    --- End diff --
    
    Can we not use System.out in a test? We're trying to get the output from a full build
to be smaller. 


> Want a memory format for PCAP files
> -----------------------------------
>
>                 Key: DRILL-5432
>                 URL: https://issues.apache.org/jira/browse/DRILL-5432
>             Project: Apache Drill
>          Issue Type: New Feature
>            Reporter: Ted Dunning
>
> PCAP files [1] are the de facto standard for storing network capture data. In security
and protocol applications, it is very common to want to extract particular packets from a
capture for further analysis.
> At a first level, it is desirable to query and filter by source and destination IP and
port or by protocol. Beyond that, however, it would be very useful to be able to group packets
by TCP session and eventually to look at packet contents. For now, however, the most critical
requirement is that we should be able to scan captures at very high speed.
> I previously wrote a (kind of working) proof of concept for a PCAP decoder that did lazy
deserialization and could traverse hundreds of MB of PCAP data per second per core. This compares
to roughly 2-3 MB/s for widely available Apache-compatible open source PCAP decoders.
> This JIRA covers the integration and extension of that proof of concept as a Drill file
format.
> Initial work is available at https://github.com/mapr-demos/drill-pcap-format
> [1] https://en.wikipedia.org/wiki/Pcap



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