Upgrading From an Older Release
Datameer customers can download updated software versions from http://my.datameer.com
To upgrade from an older release, you should first back up your data. Then you will need to upgrade the application and upgrade the database.
Upgrading to version 6.3
Parquet is the new default storage format
Datameer now uses Parquet as its default storage format as opposed to the previous sequence storage format. Sequence Files are still readable in Datameer but all new artifacts are written in Parquet. Depending on the configuration of your jobs, it might be difficult to roll back after upgrading to Datameer 6.3.
There is a property that forces Datameer to use Sequence Files instead of Parquet if a rollback is required. Under the JAVA_OPTIONS in etc/das-env.sh, add "
-Duse-sequence-storage=true" before starting Datameer for the first time following the upgrade. This property has been removed as of Datameer 7.0.
If upgrading from a Datameer version before 6.1, we highly recommend first upgrading to Datameer 6.1 and verifying that all job functions work without the MapReduce framework before upgrading to Datameer 6.3.
In 6.3, Datameer uses Parquet as its default storage format. While Datameer can still read data written in the sequence file format, all artifacts are now stored using the Parquet file format. Datameer still uses the sequence file format for writing intermediate files and preview files for performance reasons, but the final artifacts are saved using the Parquet format. Due to this change, it might not be possible to roll back after upgrading to Datameer 6.3, depending on the configuration of your artifacts. For example, if import jobs and workbooks are configured to purge historical data and only keep the last one result, the final artifacts are stored as Parquet files, and prior versions of Datameer cannot read them.
External authentication changes
As of Datameer 6.3, its' required to use ports 389/636 to connect to LDAP or the ports 3268/3269 to connect to Active Directory.
Upgrading to versions 7.0+
Ensure that Datameer application server, as well all data nodes, have Java 1.8 (Oracle recommended)
Upgrading to version 7.2
If you are upgrading to Datameer 7.2 from a 6.1.x or earlier version, must first upgrade to a 7.1.12 or later 7.1.x release, in order to trigger an important Database schema migration processes.
Upgrading with Kerberos
Keep the following in mind if you use Kerberos:
- If you used Kerberos prior to 5.11, you need to install the plug-in during upgrade.
- If you are running a Kerberos-secured cluster with impersonation enabled, you need to run the secure_hdfs_tool.sh command line tool when upgrading to versions 6 and above. For versions 6.1 and above, run the command after upgrading, starting, and stopping Datameer. Once you've run the command, restart Datameer.
Migrating workbooks and other artifacts when upgrading
Workbooks and other JSON files downloaded as a backup in older versions of Datameer are not supported in newer versions of Datameer.
When upgrading to a newer version of Datameer, ensure that all needed workbooks and files are part of the migration process so that they can be used in your new version of Datameer.
- Before upgrading Datameer, a plan should be made for application downtime scheduling, notifications, and creating a maintenance window for Datameer. Please take note of the system requirements and consider upgrading the MySQL service for Datameer's application database from 5.1 to 5.5 or 5.6, if applicable.
- Backed up Datameer files need to be included in the migration process. Previous files that aren't part of the migration process aren't supported in newer versions.
- Jobs will need to be set to stop executing prior to the upgrade process. This could be done e.g. by Pause Job Scheduler.
- Request possible assistance from the database administrator in case credentials for database are not available to the application owner.
- Custom plug-ins which were created by Using the Plug-in SDK of a former Datameer version need to be re-compiled!
- Since it is recommended to not copy old configuration files or scripts to the new location, note the changes you have made in the previous setup. This information you will need to make necessary changes in the new configuration files.
- As of Datameer 7.4, a property file exists so Job Scheduler and Event Bus settings adjusted in the UI are read during Datameer start up.
- A properties file called "overrides.properties" isn't written on Datameer but your systems HOME folder. (Path = <home>/.datameer/overrides.properties)
- This property file is auto-created when adjusting the Event Bus or Job Scheduler settings under the Admin tab. This file can also be manually added and edited.
- This is the last properties file read on start up. (E.g., it overrides other property files like default.properties and deployMode.properties)
- This file can be modified to allow for storing and the restoring of custom properties.
- As of Datameer 7.4, a property file exists so Job Scheduler and Event Bus settings adjusted in the UI are read during Datameer start up.
Disabling Housekeeping/Compaction services
In the event of a problem after a Datameer upgrade, it is possible to roll back to the previous release. To allow for the possibility of a roll back and avoid any potential data loss, Datameer strongly recommends disabling the Housekeeping and Compaction services before beginning the upgrade process. Once upgrade validation is complete and the environment is considered stable, the Housekeeping and Compaction services can be re-enabled.
- Open the /<Datameer new version installation directory>/conf/default.properties file.
- Disable Housekeeping by setting the property
- Disable Compaction by setting the property
- Start Datameer and perform upgrade validation testing.
- Once the upgrade validated and is considered successful, turn Housekeeping and Compaction back on by setting the above mentioned properties back to
Restarting Datameer is required to apply these changes
A Workbook is a complex structure that Datameer is constantly striving to improve. Workbooks can be built in a near unlimited number of different combinations of Column Renames, Joins, Unions, Filters, and Functions - including user built functions. While we do attempt to cover all the possibilities while implementing our upgrade code, some customer development decisions are unpredictable and as a result our Workbook upgrade code can not always successfully transform all workbooks.
To validate whether any Workbook has been broken during an upgrade, Datameer created the Workbook Health Check feature. The tool reviews a Workbook's structure and reports any logical issues. This tool is available in versions 6.4.14, 7.1.13, 7.2.13, 7.4.11+, 7.5.4+, and 10.0.1+. Datameer's best practice recommendations for upgrades are as follows:
- Upgrade within the current branch to the version where the Workbook Health Check tool is available. For Example, if the current version is 6.4.13, upgrade to 6.4.14.
- Navigate http://<Datameer host>:<port>/dev (admin rights are required), then click on Workbook Health Check and press Start button.
- As soon as validation is complete (execution time varies based on the number and complexity of the existing Workbooks), you will receive a status summary and the broken Workbooks configuration IDs. The same information will also be written into Datameer conductor.log together with the error for every artifact. You might want to review broken Workbooks and fix the errors before the upgrade. Note, a session timeout will interrupt the workbook validation check.
- Upgrade to the desired Datameer version.
- Rerun the Workbook Health Check and ensure that there are no new broken items. In case there are Workbooks that have been broken by the upgrade, check the error messages contained in conductor.log and decide whether you could fix them manually or need to roll back and get Datameer support assistance on the issue.
Backup Keyfiles and Keystore
Upgrade the Application
If you update Datameer using user/group root it is recommended for security to go back and change permissions back to the user/group datameer.
Pausing jobs being submitted to the cluster
Stop the application.
Unzip the upgrade file.
Move the MySQL JDBC driver located in <Datameer path>/das-data/jdbc-jars, as described into the Install the JDBC Database Drivers section of the Installation Guide.
In case you are using Datameer with MySQL as an application database, please check that database mode is configured accordingly in your etc/das-env.sh file
If upgrading in Workgroup or Enterprise versions, users may want to consider allocating additional memory in etc/das-env.sh.
Consider changing the container sizing of the Map, Reduce, and AM containers, which respectively correspond to MapReduce and Tez jobs. To do so, change the settings of the following properties:
If existing, copy the files from
the das-datafolder of the old distribution to the new location. Keep the original
das-datainformation as a backup.
Users need to check, and update if necessary, the folder where plug-in configurations are stored.
Open the file system of the previous Datameer version you are upgrading from and navigate to the
Search for the property file that defines the folder where plug-in configurations are stored.
Open the file system of the upgrade version of Datameer and find the same property in the
Check or update the new property value to be the same folder name in the previous version.
Copy the contents of the previous plug-in configurations folder into the file system of the new upgraded version of Datameer.
- If you made changes in your
conf/directory previously (like changing
log4j-<xyz>.properties), you need to apply** the same changes to the new
conf/directory of your upgraded instance.
Copy over the native libraries that you have added to Datameer (if this applies). You don't have to copy over the native libraries that are already bundled with Datameer.
- If you have made changes to the
conductor.shscript (for example, to enable SSH), apply** these changes to
/<new-location>/bin/conductor.shagain. Notice JAVA_OPTIONS has been moved to
Migrate the SSL values from the previous
start.inito the new one.
- Copy over files from
etc/custom-jars(these files could be database drivers or 3rd party libraries).
- If you are using custom Datameer plugins (jar archives stored under
etc/custom-plugins), update those to be in sync (API compatible) with the new version of Datameer and be sure to remove jar files related to older versions from
Do not copy the entire old
conf/ directory or
conductor.sh script to the new location. You need only to make changes in the new file for the changes you made previously.
Follow the steps for upgrading your MySQL or HSQL database. As of Datameer 7.4: MariaDB is supported as an alternative to MySQL.
Upgrade the MySQL database
- As of Datameer 6.0, only versions MySQL versions 5.5 and above are supported.
- It is highly recommend to backup the application database before proceeding further with the upgrade process.
- If you are upgrading from an older release, you may need to migrate your database schema.
To upgrade the database, enter the following command:
If either the structure of the MySQL database or any of the tables in the database will be modified by the Datameer upgrade, running this command automatically creates a dump of the database.
- Ensure that the script is not executed under root, but by the same user account that starts and stops Datameer.
- Run the upgrade script directly from the <INSTALLDIR>. Preface the script with the bin directory.
If your database name is different than the default
dapor the database runs on a different server or customized port, you will need to provide the additional arguments:
Check to ensure your database character encoding is set to UTF-8.
In the Database, enter:
If UTF8 was returned, open the default properties and comment in the setting
If something other than UTF8 was returned, change the database character encoding setting to UTF8 or special characters may show as corrupt.
To finish the upgrade, restart the application.
MySQL thread stack overrun during database upgrade
If you receive the above error message during an update, raise the MySQL stack size. For example,
or higher if necessary.
Migrating from HSQL to MySQL
Datameer provides a tool to migrate data from an HSQL file database to a MySQL database:
- Set-up MySQL as per the Installation Guide
Migrate HSQL database to MySQL
* Ensure this script is being run from root Datameer installation folder.
Ensure your users clear their browser caches after implementing a Datameer upgrade.
Upgrade the HSQL database
You have to use the script
bin/upgrade_hsql_db.sh to upgrade your HSQL database to a higher version. Ensure this script is run from the root Datameer installation folder.
-pi option you define the previous datameer installation. We need this folder to find the HSQL database we want to upgrade.
We backup your previous database into your current installation folder. Furthermore we use all upgrade scripts with name pattern
upgrade-<version>.hsql in your current installation folder.
As an option you can use the parameters
-odd . These parameters define the new/old location of your
das-data folder. When you running datameer in LOCAL mode it could be possible that you want to copy your
das-data folder to a new location. A common use case is when the
das-data folder is saved within the installation directory.
Here is an example of what it looks like when upgrading a database.
Check or Update YARN Path Settings
Check or update YARN application classpath and LD_LIBRARY path. The path settings are used to lookup and load libraries , therefor incorrect path settings may lead into unexpected behavior .
Open the Administration tab
Open the Hadoop Cluster options
Check or update YARN application classpath and LD_LIBRARY path
Retrigger the Search Index
The search settings to enable file search within the 'File Browser' must be retriggered manually after the upgrade.
All plug-ins used that aren't a part of standard distribution, e.g., Advanced Governance package, require an upgrade.
- Check if any plug-ins are located in <OLD Datameer version installation folder>/etc/custom-plugins/.
- Request a Datameer representative to provide these plug-ins recompiled for the Datameer version you are upgrading to.
- Copy the new versions of the plugins to <NEW Datameer version installation folder>/etc/custom-plugins/.
Validate the Upgrade
After the upgrade has completed, preform a test to validate that the upgrade was successful.
- Start Datameer.
- If applicable, upload recompiled plug-ins.
- Validate the upgrade by preforming tests with baseline jobs that could previously be run without errors.
- If applicable, test custom plug-ins.
- Create a connection where the data is stored, import the data, add and modify the data in a workbook, and run the data.
If no unexpected errors occur the upgrade has been validated.
Removing Extraneous Properties After Upgrade Adjustments
The support for MapReduce has been deprecated and was removed in Datameer 6.3. After it is verified that all jobs work without the MapReduce framework, remove MapReduce related custom properties from the Hadoop cluster page under the Administration tab and in the advanced settings of data links, import jobs, and/or workbooks.
How to Roll Back to a Previous Database Version
When upgrading, a database dump is created by Datameer, the file name is similar to
mysql_db_dump_<oldVer>.sql. If an upgrade failed (failing upgrade scripts / failing upgrade injectors during startup), the database paths might be conflicting, it is therefore necessary to restore the Datameer MySQL database dump. Follow the steps to complete this task.
Drop the new database, for example on the database server or the MySQL CLI.
mysql-init.sqlscript, create a new database.
Import and restore the previous database using the following shell command.