[jira] [Created] (AMBARI-10143) DataNode fails to start because of lowercase converversion of data dir path in data_dir_mount_file.

["Paulo Tioseco (JIRA)" <ji...@apache.org>]

Paulo Tioseco created AMBARI-10143:
--------------------------------------

             Summary: DataNode fails to start because of lowercase converversion of data dir path in data_dir_mount_file.
                 Key: AMBARI-10143
                 URL: https://issues.apache.org/jira/browse/AMBARI-10143
             Project: Ambari
          Issue Type: Bug
          Components: ambari-agent
    Affects Versions: 1.7.0
         Environment: Ubuntu 12.04 x64
            Reporter: Paulo Tioseco


The code that handles creating the data dir and reading data_dir_mount_file explicitly converts the data dir paths to lower case.

This behavior is undesired because when the value of dfs.datanode.data.dir contains one or more uppercase characters, it won't be able to match any item in the data_dir_mount_file since Linux file paths are case sensitive.

The issue may be reproduced by creating a single node cluster and setting the value of the "DataNode directories" in "CLUSTER INSTALL WIZARD > Customize Services > HDFS > DataNode" to: /UPPER_CASE_DIR/data

Continue to the next step and the "DataNode start" task will fail with the following exception (from /var/log/hadoop/hdfs/hadoop-hdfs-datanode-*.log):

```
datanode.DataNode (DataNode.java:checkStorageLocations(2284)) - Invalid dfs.datanode.data.dir /UPPER_CASE_DIR/data :
java.io.FileNotFoundException: File file:/UPPER_CASE_DIR/data does not exist
```

The checkStorageLocations function won't be able to find the directory because the directory name was created with all lower case characters (from /var/lib/ambari-agent/data/output-9.txt):

```
Forcefully creating directory: /upper_case_dir/data
```

The data_dir_mount_file and hdfs-site.xml also shows the case mismatch of the data dir path:

```
$ grep -rni UPPER_CASE_DIR /etc/hadoop/
/etc/hadoop/conf.empty/hdfs-site.xml:46:      <value>/UPPER_CASE_DIR/data</value>
/etc/hadoop/conf.empty/dfs_data_dir_mount.hist:7:/upper_case_dir/data,/
/etc/hadoop/conf/hdfs-site.xml:46:      <value>/UPPER_CASE_DIR/data</value>
/etc/hadoop/conf/dfs_data_dir_mount.hist:7:/upper_case_dir/data,/
```



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