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https://issues.apache.org/jira/browse/HADOOP-12610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15044806#comment-15044806
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Steve Loughran commented on HADOOP-12610:
-----------------------------------------
HDFS-9514 failing. [~jojochuang]: if you want to work on this, the ones that
fail are the obvious target —we need those fixes to find the real causes
> Tests lose stack traces on failures
> -----------------------------------
>
> Key: HADOOP-12610
> URL: https://issues.apache.org/jira/browse/HADOOP-12610
> Project: Hadoop Common
> Issue Type: Improvement
> Components: test
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Minor
> Labels: supportability
>
> I saw a test failure in TestCompressorDecompressor.testCompressorDecompressor
> with the output
> Error Message
> {noformat}
> testCompressorDecompressor error !!!java.lang.NullPointerException
> {noformat}
> Stacktrace
> {noformat}
> java.lang.AssertionError: testCompressorDecompressor error
> !!!java.lang.NullPointerException
> at org.junit.Assert.fail(Assert.java:88)
> at
> org.apache.hadoop.io.compress.TestCompressorDecompressor.testCompressorDecompressor(TestCompressorDecompressor.java:69)
> {noformat}
> However, this message does not expose the origin of the exception, nor does
> it print the error message. This makes debugging impossible. I also found the
> similar practice exists in multiple test files:
> {noformat}
> ~/hadoop/hadoop-common-project/hadoop-common ((c21a801...)) $ grep -r
> "fail(.*+ e" .|less
> ./src/test/java/org/apache/hadoop/net/TestNetworkTopologyWithNodeGroup.java:
> fail("Expecting IllegalArgumentException, but caught:" + e);
> ./src/test/java/org/apache/hadoop/io/nativeio/TestNativeIO.java:
> fail("Got unexpected exception: " + e.getMessage());
> ./src/test/java/org/apache/hadoop/io/nativeio/TestNativeIO.java:
> fail("Got unexpected exception: " + e.getMessage());
> ./src/test/java/org/apache/hadoop/io/nativeio/TestNativeIO.java:
> fail("Got unexpected exception: " + e.getMessage());
> ./src/test/java/org/apache/hadoop/io/TestMapFile.java: fail("testRename
> error " + ex);
> ./src/test/java/org/apache/hadoop/io/compress/snappy/TestSnappyCompressorDecompressor.java:
> fail("testSnappyDirectBlockCompression ex !!!" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("testCompressorDecompressor error !!!" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("testCompressorDecompressorWithExeedBufferLimit error !!!" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("testZlibCompressorDecompressorWithConfiguration ex error " +
> ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("testZlibCompressDecompress ex !!!" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("testZlibDirectCompressDecompress ex !!!" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("testBuiltInGzipDecompressorExceptions npe error " + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("testBuiltInGzipDecompressorExceptions aioob error" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("invalid 0 and 1 byte in gzip stream" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("invalid 2 byte in gzip stream" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("invalid 3 byte in gzip stream" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java:
> fail("invalid 3 byte make hasExtraField" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/TestCompressorDecompressor.java:
> fail("testCompressorDecompressor error !!!" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/TestCompressorDecompressor.java:
> fail("testCompressorDecompressorWithExeedBufferLimit error !!!" + ex);
> ./src/test/java/org/apache/hadoop/io/compress/TestBlockDecompressorStream.java:
> fail("unexpected IOException : " + e);
> ./src/test/java/org/apache/hadoop/io/compress/bzip2/TestBzip2CompressorDecompressor.java:
> fail("testBzip2CompressDecompress ex !!!" + ex);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("" + e);
> ./src/test/java/org/apache/hadoop/util/bloom/BloomFilterCommonTester.java:
> Assert.fail("error ex !!!" + ex);
> ./src/test/java/org/apache/hadoop/util/TestShell.java: fail("Expected an
> exception with the text `" + expectedText + "`"
> ./src/test/java/org/apache/hadoop/util/TestShell.java: fail("Expected an
> exception with the text `" + expectedText + "`"
> ./src/test/java/org/apache/hadoop/tracing/SetSpanReceiver.java:
> Assert.fail("timed out to get expected spans: " + e.getMessage());
> ./src/test/java/org/apache/hadoop/tracing/SetSpanReceiver.java:
> Assert.fail("interrupted while waiting spans: " + e.getMessage());
> ./src/test/java/org/apache/hadoop/ipc/TestRPCCompatibility.java:
> fail("Expected version mismatch but got " + ex);
> ./src/test/java/org/apache/hadoop/ipc/TestRPC.java: fail("Expecting
> HadoopIllegalArgumentException but caught " + e);
> ./src/test/java/org/apache/hadoop/ipc/TestRPC.java: fail("Expecting
> HadoopIllegalArgumentException but caught " + e);
> ./src/test/java/org/apache/hadoop/ipc/TestRPC.java: fail("Expecting
> HadoopIllegalArgumentException but caught " + e);
> ./src/test/java/org/apache/hadoop/security/token/delegation/TestDelegationToken.java:
> Assert.fail("action did not throw " + except);
> {noformat}
> I am filing this JIRA to make failure messages more verbose and make
> debugging easier. There are of course similar patterns in other part of
> Hadoop codebase, but I am starting with this one because I do see test
> failures here.
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