[jira] [Created] (HDDS-4269) Ozone DataNode thinks a volume is failed if an unexpected file is in the HDDS root directory

["Wei-Chiu Chuang (Jira)" <ji...@apache.org>]

Wei-Chiu Chuang created HDDS-4269:
-------------------------------------

             Summary: Ozone DataNode thinks a volume is failed if an unexpected file is in the HDDS root directory
                 Key: HDDS-4269
                 URL: https://issues.apache.org/jira/browse/HDDS-4269
             Project: Hadoop Distributed Data Store
          Issue Type: Bug
          Components: Ozone Datanode
    Affects Versions: 1.1.0
            Reporter: Wei-Chiu Chuang


Took me some time to debug a trivial bug.

DataNode crashes after this mysterious error and no explanation:
{noformat}
10:11:44.382 PM	INFO	MutableVolumeSet	Moving Volume : /var/lib/hadoop-ozone/fake_datanode/data/hdds to failed Volumes
10:11:46.287 PM	ERROR	StateContext	Critical error occurred in StateMachine, setting shutDownMachine
10:11:46.287 PM	ERROR	DatanodeStateMachine	DatanodeStateMachine Shutdown due to an critical error
{noformat}
Turns out that if there are unexpected files under the hdds directory ($hdds.datanode.dir/hdds), DN thinks the volume is bad and move it to failed volume list, without an error explanation. I was editing the VERSION file and vim created a temp file under the directory. This is impossible to debug without reading the code.
{code:java|title=HddsVolumeUtil#checkVolume()}
} else if(hddsFiles.length == 2) {
      // The files should be Version and SCM directory
      if (scmDir.exists()) {
        return true;
      } else {
        logger.error("Volume {} is in Inconsistent state, expected scm " +
                "directory {} does not exist", volumeRoot, scmDir
            .getAbsolutePath());
        return false;
      }
    } else {
      // The hdds root dir should always have 2 files. One is Version file
      // and other is SCM directory.
      <---- HERE!
      return false;
    }
{code}



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