HADOOP-16768. SnappyCompressor test cases wrongly assume that the compressed data is always smaller than the input data.

[aajisaka]

Backport HADOOP-16768 to fix TestSnappyCompressorDecompressor and TestCompressorDecompressor.

https://ci-hadoop.apache.org/job/hadoop-qbt-branch-3.2-java8-linux-x86_64/1/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt

[ERROR] Failures: 
[ERROR]   TestCompressorDecompressor.testCompressorDecompressor:69  Expected to find 'testCompressorDecompressor error !!!' but got unexpected exception: java.lang.NullPointerException
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:877)
	at com.google.common.base.Joiner.toString(Joiner.java:452)
	at com.google.common.base.Joiner.appendTo(Joiner.java:109)
	at com.google.common.base.Joiner.appendTo(Joiner.java:152)
	at com.google.common.base.Joiner.join(Joiner.java:195)
	at com.google.common.base.Joiner.join(Joiner.java:185)
	at com.google.common.base.Joiner.join(Joiner.java:211)
	at org.apache.hadoop.io.compress.CompressDecompressTester$CompressionTestStrategy$2.assertCompression(CompressDecompressTester.java:329)
	at org.apache.hadoop.io.compress.CompressDecompressTester.test(CompressDecompressTester.java:135)
	at org.apache.hadoop.io.compress.TestCompressorDecompressor.testCompressorDecompressor(TestCompressorDecompressor.java:66)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)

[ERROR]   TestCompressorDecompressor.testCompressorDecompressorWithExeedBufferLimit:92  Expected to find 'testCompressorDecompressorWithExeedBufferLimit error !!!' but got unexpected exception: java.lang.NullPointerException
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:877)
	at com.google.common.base.Joiner.toString(Joiner.java:452)
	at com.google.common.base.Joiner.appendTo(Joiner.java:109)
	at com.google.common.base.Joiner.appendTo(Joiner.java:152)
	at com.google.common.base.Joiner.join(Joiner.java:195)
	at com.google.common.base.Joiner.join(Joiner.java:185)
	at com.google.common.base.Joiner.join(Joiner.java:211)
	at org.apache.hadoop.io.compress.CompressDecompressTester$CompressionTestStrategy$2.assertCompression(CompressDecompressTester.java:329)
	at org.apache.hadoop.io.compress.CompressDecompressTester.test(CompressDecompressTester.java:135)
	at org.apache.hadoop.io.compress.TestCompressorDecompressor.testCompressorDecompressorWithExeedBufferLimit(TestCompressorDecompressor.java:89)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)

[ERROR] Errors: 
[ERROR]   TestSnappyCompressorDecompressor.testSnappyCompressDecompress:192 » Internal C...
[ERROR]   TestSnappyCompressorDecompressor.testSnappyCompressDecompressInMultiThreads:409 » Runtime

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	11m 14s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 2 new or modified test files.
			_ branch-3.2 Compile Tests _
+0 🆗	mvndep	3m 22s		Maven dependency ordering for branch
+1 💚	mvninstall	25m 36s		branch-3.2 passed
+1 💚	compile	15m 35s		branch-3.2 passed
+1 💚	checkstyle	2m 40s		branch-3.2 passed
+1 💚	mvnsite	1m 41s		branch-3.2 passed
+1 💚	javadoc	1m 31s		branch-3.2 passed
+0 🆗	spotbugs	0m 27s		branch/hadoop-project no spotbugs output file (spotbugsXml.xml)
+1 💚	shadedclient	15m 26s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 23s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 3s		the patch passed
+1 💚	compile	14m 51s		the patch passed
+1 💚	javac	14m 51s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	2m 37s		the patch passed
+1 💚	mvnsite	1m 41s		the patch passed
+1 💚	xml	0m 2s		The patch has no ill-formed XML file.
+1 💚	javadoc	1m 26s		the patch passed
+0 🆗	spotbugs	0m 24s		hadoop-project has no data from spotbugs
+1 💚	shadedclient	16m 1s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	0m 22s		hadoop-project in the patch passed.
+1 💚	unit	16m 1s		hadoop-common in the patch passed.
+1 💚	asflicense	0m 43s		The patch does not generate ASF License warnings.
		136m 59s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3264/1/artifact/out/Dockerfile
GITHUB PR	#3264
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell xml spotbugs checkstyle
uname	Linux 1a9fea32a89d 4.15.0-143-generic #147-Ubuntu SMP Wed Apr 14 16:10:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-3.2 / 19c0c1f
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~18.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3264/1/testReport/
Max. process+thread count	1273 (vs. ulimit of 5500)
modules	C: hadoop-project hadoop-common-project/hadoop-common U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3264/1/console
versions	git=2.17.1 maven=3.6.0 spotbugs=4.2.2
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