> On March 19, 2014, 3:17 a.m., Jay Kreps wrote: > > clients/src/main/java/org/apache/kafka/common/record/CompressionFactory.java, > > line 46 > > <https://reviews.apache.org/r/18299/diff/14/?file=526586#file526586line46> > > > > I don't think this is needed. Inside an if statement you should be able > > to refer to a class. The class only loads if that branch is taken. > > Guozhang Wang wrote: > Just tested and verified that if the library is imported in the class > file, then whenever that class is ever executed the library will be loaded. > So we have t use the class loader. > > Jay Kreps wrote: > Here was the test I did last night to verify prior to my comment: > > jkreps-mn:tmp jkreps$ cat Test.java > > class Test { > > public static void main(String[] args) throws Exception { > if(args.length == 0) > return; > else > new org.xerial.snappy.SnappyOutputStream(System.out); > } > }jkreps-mn:tmp jkreps$ javac -cp > /Users/jkreps/.m2/repository/org/xerial/snappy/snappy-java/1.0.3.2/snappy-java-1.0.3.2.jar > Test.java > jkreps-mn:tmp jkreps$ java Test > jkreps-mn:tmp jkreps$ java Test 0 > Exception in thread "main" java.lang.NoClassDefFoundError: > org/xerial/snappy/SnappyOutputStream > at Test.main(Test.java:8) > Caused by: java.lang.ClassNotFoundException: > org.xerial.snappy.SnappyOutputStream > at java.net.URLClassLoader$1.run(URLClassLoader.java:202) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:190) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > at java.lang.ClassLoader.loadClass(ClassLoader.java:247) > ... 1 more
Tried various ways including 1) if-else 2) explicit reference of org.xerial.snappy.SnappyOutputStream inside case(if) statements Nothing works. I think it has something to do with the eager loader: http://javarevisited.blogspot.com/2012/07/when-class-loading-initialization-java-example.html - Guozhang ----------------------------------------------------------- This is an automatically generated e-mail. To reply, visit: https://reviews.apache.org/r/18299/#review37679 ----------------------------------------------------------- On March 19, 2014, 11:32 p.m., Guozhang Wang wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://reviews.apache.org/r/18299/ > ----------------------------------------------------------- > > (Updated March 19, 2014, 11:32 p.m.) > > > Review request for kafka. > > > Bugs: KAFKA-1253 > https://issues.apache.org/jira/browse/KAFKA-1253 > > > Repository: kafka > > > Description > ------- > > Incorporated Jay's comments > > In-place compression with > > 1) Dynamic reallocation in the underlying byte buffer > 2) Written bytes estimate to reduce reallocation probabilities > 3) Deallocation in buffer pool following the original capacity > > > Diffs > ----- > > build.gradle 84fa0d6b5f7405af755c5d7ff7bdd7592bb8668f > clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java > 1ac69436f117800815b8d50f042e9e2a29364b43 > clients/src/main/java/org/apache/kafka/clients/producer/ProducerConfig.java > 32e12ad149f6d70c96a498d0a390976f77bf9e2a > > clients/src/main/java/org/apache/kafka/clients/producer/internals/BufferPool.java > b69866a9fb9a8b4e1e78d304a20eda3cbf178c6f > > clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordAccumulator.java > 673b2962771c28ceb3c7a6c0fd6f69521bd7ed16 > > clients/src/main/java/org/apache/kafka/clients/producer/internals/RecordBatch.java > 038a05a94b795ec0a95b2d40a89222394b5a74c4 > > clients/src/main/java/org/apache/kafka/clients/tools/ProducerPerformance.java > 3ebbb804242be6a001b3bae6524afccc85a87602 > > clients/src/main/java/org/apache/kafka/common/record/ByteBufferInputStream.java > PRE-CREATION > > clients/src/main/java/org/apache/kafka/common/record/ByteBufferOutputStream.java > PRE-CREATION > clients/src/main/java/org/apache/kafka/common/record/CompressionType.java > 906da02d02c03aadd8ab73ed2fc9a1898acb8d72 > clients/src/main/java/org/apache/kafka/common/record/Compressor.java > PRE-CREATION > clients/src/main/java/org/apache/kafka/common/record/MemoryRecords.java > 9d8935fa3beeb2a78b109a41ed76fd4374239560 > clients/src/main/java/org/apache/kafka/common/record/Record.java > f1dc9778502cbdfe982254fb6e25947842622239 > clients/src/main/java/org/apache/kafka/common/utils/Crc32.java > 153c5a6d345293aa0ba2cf513373323a6e9f2467 > clients/src/main/java/org/apache/kafka/common/utils/Utils.java > 0c6b3656375721a718fb4de10118170aacce0ea9 > clients/src/test/java/org/apache/kafka/common/record/MemoryRecordsTest.java > b0745b528cef929c4273f7e2ac4de1476cfc25ad > clients/src/test/java/org/apache/kafka/common/record/RecordTest.java > ae54d67da9907b0a043180c7395a1370b3d0528d > clients/src/test/java/org/apache/kafka/common/utils/CrcTest.java > PRE-CREATION > clients/src/test/java/org/apache/kafka/test/TestUtils.java > 36cfc0fda742eb501af2c2c0330e3f461cf1f40c > core/src/main/scala/kafka/producer/ConsoleProducer.scala > dd39ff22c918fe5b05f04582b748e32349b2055f > core/src/test/scala/integration/kafka/api/ProducerCompressionTest.scala > PRE-CREATION > core/src/test/scala/integration/kafka/api/ProducerFailureHandlingTest.scala > c002f5ea38ece66ad559fadb18ffaf40ac2026aa > core/src/test/scala/integration/kafka/api/ProducerSendTest.scala > 66ea76b9b6c0f8839f715c845fb9b9671b8f35c1 > perf/src/main/scala/kafka/perf/ProducerPerformance.scala > 3df0d130308a35fca96184adc21eeee2eea1488f > > Diff: https://reviews.apache.org/r/18299/diff/ > > > Testing > ------- > > integration tests > > unit tests > > stress tests (1K message size, 1M messages in producer performance with ack = > 1, linger time = 0ms/500ms, random bit/all-ones messages) > > snappy dynamic load test > > > Thanks, > > Guozhang Wang > >
