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https://issues.apache.org/jira/browse/AMBARI-10143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14371515#comment-14371515
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Paulo Tioseco commented on AMBARI-10143:
----------------------------------------
There were no new/modified tests because that would require refactoring the
lines of code that deal with path operations to another function.
After applying the patch, the installer will now succeed since the data dir
path of the data_dir_mount_file and hdfs-site.xml now match:
{code}
$ 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,/
{code}
> DataNode fails to start because of lowercase conversion 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
> Attachments: AMBARI-10143.patch
>
>
> 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):
> {code}
> 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
> {code}
> 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):
> {code}
> Forcefully creating directory: /upper_case_dir/data
> {code}
> The data_dir_mount_file and hdfs-site.xml also shows the case mismatch of the
> data dir path:
> {code}
> $ 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,/
> {code}
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