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https://issues.apache.org/jira/browse/AMBARI-13251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alejandro Fernandez updated AMBARI-13251:
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Attachment: AMBARI-13251.patch
> 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
>
> Attachments: AMBARI-13251.patch
>
>
> 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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