Ctest created HDFS-15128:
----------------------------
Summary: Unit test failing to clean testing data and caused Maven
to crash
Key: HDFS-15128
URL: https://issues.apache.org/jira/browse/HDFS-15128
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs, test
Affects Versions: 3.2.1
Reporter: Ctest
*Description:*
Actively-used test helper function `testVolumeConfig` in
`org.apache.hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureToleration`
chmod a directory with invalid perm 000 for testing purposes but later failed
to chmod back this directory with a valid perm if the assertion inside this
function failed. Any subsequent `mvn test` command would fail to run if this
test had failed before. It is because Maven failed to build itself as it did
not have permission to clean the temporarily-generated directory that has perm
000. See below for the code snippet that is buggy.
{code:java}
try {
for (int i = 0; i < volumesFailed; i++) {
prepareDirToFail(dirs[i]); // this will chmod dirs[i] to perm 000
}
restartDatanodes(volumesTolerated, manageDfsDirs);
} catch (DiskErrorException e) {
...
} finally {
...
}
assertEquals(expectedBPServiceState, bpServiceState);
for (File dir : dirs) {
FileUtil.chmod(dir.toString(), "755");
}
}
{code}
The failure of the statement `assertEquals(expectedBPServiceState,
bpServiceState)` caused function to terminate without executing
`FileUtil.chmod(dir.toString(), "755")` for each temporary directory with
invalid perm 000 the test has created.
*Consequence:*
Any subsequent `mvn test` command would fail to run if this test had failed
before. It is because Maven failed to build itself since it does not have
permission to clean this temporarily-generated directory. For details of the
failure, see below:
{noformat}
[INFO] --- maven-antrun-plugin:1.7:run (create-log-dir) @ hadoop-hdfs ---
[INFO] Executing tasks
main:
[delete] Deleting directory
/home/ctest/app/Ctest-Hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 8.349 s
[INFO] Finished at: 2019-12-27T03:53:04-06:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute
goalorg.apache.maven.plugins:maven-antrun-plugin:1.7:run (create-log-dir) on
project hadoop-hdfs: An Ant BuildException has occured: Unable to delete
directory
/home/ctest/app/Ctest-Hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/dfs/data/data1/current
[ERROR] around Ant part ...<delete
dir="/home/ctest/app/Ctest-Hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data"/>...
@ 4:105 in
/home/ctest/app/Ctest-Hadoop/hadoop-hdfs-project/hadoop-hdfs/target/antrun/build-main.xml
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please
read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException{noformat}
*Root Cause:*
The test helper function
`org.apache.hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureToleration#testVolumeConfig`
purposely set the directory
`/home/ctest/app/Ctest-Hadoop/hadoop-hdfs-project/hadoop-hdfs/target/test/data/dfs/data/data1/current`
to have perm 000. And at the end of this function, it changed the perm of this
directory to 755. However, there is an assertion in this function before the
perm was able to changed to 755. Once this assertion fails, the function
terminates before the directory’s perm can be changed to 755. Hence, this
directory was later unable to be removed by Maven for when executing `mvn
test`.
*Fix:*
In
`org.apache.hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureToleration#testVolumeConfig`,
move the assertion `assertEquals(expectedBPServiceState, bpServiceState)` to
the last line of this function. This fix will fix the bug and will not change
the test outcome.
*Content for the patch:*
{code:java}
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeFailureToleration.java
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeFailureToleration.java
index a9e4096df4b..a492fa5fd44 100644
---
a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeFailureToleration.java
+++
b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeFailureToleration.java
@@ -256,11 +256,11 @@ private void testVolumeConfig(int volumesTolerated, int
volumesFailed,
cluster.getDataNodes().get(0)
.isBPServiceAlive(cluster.getNamesystem().getBlockPoolId());
}
- assertEquals(expectedBPServiceState, bpServiceState);
for (File dir : dirs) {
FileUtil.chmod(dir.toString(), "755");
}
+ assertEquals(expectedBPServiceState, bpServiceState);
}
}
{code}
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