Alejandro Fernandez created AMBARI-13251:
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Summary: RU - HDFS_Client restart and hdp-select causes
dfs_data_dir_mount.hist to be lost
Key: AMBARI-13251
URL: https://issues.apache.org/jira/browse/AMBARI-13251
Project: Ambari
Issue Type: Bug
Components: ambari-server
Affects Versions: 2.1.2
Reporter: Alejandro Fernandez
Assignee: Alejandro Fernandez
Priority: Blocker
Fix For: 2.1.2
During the Clients group of RU, restarting hdfs_client changes changes the
symlink /usr/hdp/current/hadoop-client/ from the old version to the new version.
Because the Data Dir Mount History file is stored at
/etc/hadoop/conf/dfs_data_dir_mount.hist and
/etc/hadoop/conf symlinks to /usr/hdp/current/hadoop-client/conf
it means that the file must be copied to the new location.
Multiple clients (HDFS, HBase, Hive, YARN, MapReduce, Pig, Slider, Tez)
actually end up calling
{code}
hdp_select.select("hadoop-client", params.version)
{code}
that changes the symlink, so the first one to be ran during RU must copy the
file. If DataNode is present, it means that HDFS Client is guaranteed to be
there, and from all of those clients it is the first one in the Upgrade Pack.
During a Rolling Downgrade, the file should already exist in the previous
version, and the file is only written to when DataNode is restarted, so we are
ok.
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