Upgrading DataStax Enterprise 6.7 to 6.8
Instructions for upgrading DSE 6.7 to 6.8.
dse-env.sh
The default location of the dse-env.sh file depends on the type of installation:Package installations | /etc/dse/dse-env.sh |
Tarball installations | installation_location/bin/dse-env.sh |
DataStax Enterprise and Apache Cassandra™ configuration files
Configuration file | Installer-Services and package installations | Installer-No Services and tarball installations |
---|---|---|
DataStax Enterprise configuration files | ||
dse | /etc/default/dse (systemd) or /etc/init.d/ (SystemV) | N/A. Node type is set via command line flags. |
byoh-env.sh | /etc/dse/byoh-env.sh | install_location/bin/byoh-env.sh |
dse.yaml | /etc/dse/dse.yaml | install_location/resources/dse/conf/dse.yaml |
logback.xml | /etc/dse/cassandra/logback.xml | install_location/resources/logback.xml |
spark-env.sh | /etc/dse/spark/spark-env.sh | install_location/resources/spark/conf/spark-env.sh |
spark-defaults.conf | /etc/dse/spark/spark-defaults.conf | install_location/resources/spark/conf/spark-defaults.conf |
Cassandra configuration files | ||
cassandra.yaml | /etc/dse/cassandra/cassandra.yaml | install_location/conf/cassandra.yaml |
cassandra.in.sh | /usr/share/cassandra/cassandra.in.sh | install_location/bin/cassandra.in.sh |
cassandra-env.sh | /etc/dse/cassandra/cassandra-env.sh | install_location/conf/cassandra-env.sh |
cassandra-rackdc.properties | /etc/dse/cassandra/cassandra-rackdc.properties | install_location/conf/cassandra-rackdc.properties |
cassandra-topology.properties | /etc/dse/cassandra/cassandra-topology.properties | install_location/conf/cassandra-topology.properties |
jmxremote.password | /etc/cassandra/jmxremote.password | install_location/conf/jmxremote.password |
Tomcat server configuration file | ||
server.xml | /etc/dse/resources/tomcat/conf/server.xml | install_location/resources/tomcat/conf/server.xml |
DataStax driver changes
DataStax drivers come in two types:
- DataStax drivers for DataStax Enterprise — for use by DSE 4.8 and later
- DataStax drivers for Apache Cassandra™ — for use by Apache Cassandra™ and DSE 4.7 and earlier
OpsCenter version | DSE version |
---|---|
6.8 | 6.8, 6.7, 6.0, 5.1 |
6.7 | 6.7, 6.0, 5.1 |
6.5 | 6.0, 5.1, 5.0 (EOL) |
6.1 | 5.1, 5.0 (EOL), 4.8 (EOSL) |
6.0 | 5.0 (EOL), 4.8 (EOSL), 4.7 (EOSL) |
cassandra.yaml
The location of the cassandra.yaml file depends on the type of installation:Package installations | /etc/dse/cassandra/cassandra.yaml |
Tarball installations | installation_location/resources/cassandra/conf/cassandra.yaml |
Upgrade order
Upgrade nodes in this order:- In multiple datacenter clusters, upgrade every node in one datacenter before upgrading another datacenter.
- Upgrade the seed nodes within a datacenter first.
- Upgrade nodes in this order:
- DSE Analytics datacenters
- Transactional/DSE Graph datacenters
- DSE Search datacenters
The upgrade process for DataStax Enterprise provides minimal downtime (ideally zero). During this process, upgrade and restart one node at a time while other nodes continue to operate online. With a few exceptions, the cluster continues to work as though it were on the earlier version of DataStax Enterprise until all of the nodes in the cluster are upgraded.
zerocopy_streaming_enabled=false
in
cassandra.yaml and perform a rolling restart, AND/OR
run upgradesstables
on all nodes in your cluster before adding new nodes,
running repair, or restoring from backups. This bug is addressed in DSE 6.8.9.Back up your existing installation
Upgrade SSTables
Version specific notes
facet.limit=-1
. The maximum facet limit value is 20,000 as
set by solr.max.facet.limit.size
. While the facet limit size can be
overriden using -Dsolr.max.facet.limit.size
in jvm[ 8 | 11
]-server.options, depending upon your JVM version, it is not
recommended.Upgrade restrictions and limitations
Restrictions and limitations apply while a cluster is in a partially upgraded state. The cluster continues to work as though it were on the earlier version of DataStax Enterprise until all of the nodes in the cluster are upgraded.
General restrictions
- Do not enable new features.
- Ensure OpsCenter compatibility. See the compatibility table.
- Do not run nodetool repair.
- Stop the OpsCenter Repair Service if enabled: 6.5 | 6.7 | 6.8.
- During the upgrade, do not bootstrap new nodes or decommission existing nodes.
- Do not issue TRUNCATE or DDL related queries during the upgrade process.
- Do not alter schemas for any workloads.
- Complete the cluster-wide upgrade before the expiration of
gc_grace_seconds
(approximately 13 days) to ensure any repairs complete successfully. - If the DSE Performance Service was disabled before the upgrade, do not enable it during the upgrade. See DSE Performance Service: 6.7 | 6.0 | 5.1 | 5.0 | OpsCenter 6.8 | OpsCenter 6.7 | OpsCenter 6.5.
Restrictions for nodes using security
- Do not change security credentials or permissions until the upgrade is complete on all nodes.
- If you are not already using Kerberos, do not set up Kerberos authentication before upgrading. First upgrade the cluster, and then set up Kerberos.
Restrictions for DSE Advanced Replication nodes
Upgrades are supported only for DSE Advanced Replication V2.
Driver version impacts
Be sure to check driver compatibility. Depending on the driver version, you might need to recompile your client application code. See DataStax driver changes.
- Protocol version: Set the protocol version explicitly in your application at start up. Switch to the Java driver to the new protocol version only after the upgrade is complete on all nodes in the cluster.
- Initial contact points: Ensure that the list of initial contact points contains only hosts with the oldest DSE version or protocol version. For example, the initial contact points contain only protocol version 2.
Preparing to upgrade
Follow these steps to prepare each node for the upgrade:
- Upgrade to the latest patch release on your current version. Fixes included in
the latest patch release can simplify the upgrade process.Get the current DSE version:
bin/dse -v current_dse_version
- Familiarize yourself with the changes and features in the new release:
- DataStax Enterprise 6.8 release notes.
- General upgrading advice for any version. Be sure to read 6.8 NEWS.txt all the way back to your current version.
- DataStax Enterprise changes in 6.8 CHANGES.txt.
- DataStax driver changes.
- Before upgrading, be sure that each node has adequate free disk
space. Determine current DSE data disk space usage:
sudo du -sh /var/lib/cassandra/data/ 3.9G /var/lib/cassandra/data/
Determine available disk space:sudo df -hT / Filesystem Type Size Used Avail Use% Mounted on /dev/sda1 ext4 59G 16G 41G 28% /
Important: The required space depends on the compaction strategy. See Disk space - Upgrade the SSTables on each node to ensure that all
SSTables are on the current version:
nodetool upgradesstables
Warning: Failure to upgrade SSTables when required results in a significant performance impact and increased disk usage.Tip: Use the--jobs
option to set the number of SSTables that upgrade simultaneously. The default setting is 2, which minimizes impact on the cluster. Set to 0 to use all available compaction threads. DataStax recommends running theupgradesstables
command on one node at a time or when using racks, one rack at a time.If the SSTables are already on the current version, the command returns immediately and no action is taken.
- Ensure that keyspace replication factors are correct for your environment:
cqlsh --execute "DESCRIBE KEYSPACE keyspace-name;" | grep "replication" CREATE KEYSPACE keyspace-name WITH replication = {'class': 'NetworkTopologyStrategy, 'replication_factor': '3'} AND durable_writes = true;
- Check the keyspace replication factor for analytics keyspaces.
- Check the keyspace replication factor for system_auth and dse_security keyspaces.
- Verify the Java runtime version and upgrade to the recommended version.
java -version openjdk version "1.8.0_222" OpenJDK Runtime Environment (build 1.8.0_222-8u222-b10-1ubuntu1~18.04.1-b10) OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)
- Recommended: OpenJDK 8 (1.8.0_151 minimum)
Note: Recommendation changed due to the end of public updates for Oracle JRE/JDK 8. See Oracle Java SE Support Roadmap.
- Supported: Oracle Java SE 8 (JRE or JDK) (1.8.0_151 minimum)
Important: Although Oracle JRE/JDK 8 is supported, DataStax does more extensive testing on OpenJDK 8. - Recommended: OpenJDK 8 (1.8.0_151 minimum)
- Run nodetool repair to ensure that data on each
replica is consistent with data on other
nodes:
nodetool repair -pr
- Back up any customized
configuration files since they may be overwritten with
default values during installation of the new version. Tip: If you backed up your installation using instructions in Backing up and restoring DSE, your original configuration files are included in the archive.
Upgrade steps
- Flush the commit log of the current
installation:
nodetool drain
- Stop the node:
- Package
installations:
sudo service dse stop
- Tarball
installations:
installation_dir/bin/dse cassandra-stop
- Package
installations:
- Use the appropriate method to install the new product version on a supported platform:
- To configure the new version:
-
Compare changes in the new configuration files with the backup configuration files after the upgrade but before restarting, remove deprecated settings, and update any new settings if required.Warning: Do not simply replace new configuration files with old. Rather compare your old files to the new files and make any required changes.Tip: Use the DSE yaml_diff tool to compare backup YAML files with the upgraded YAML files:
cd /usr/share/dse/tools/yamls
./yaml_diff path/to/yaml-file-old path/to/yaml-file-new ... CHANGES ========= authenticator: - AllowAllAuthenticator + com.datastax.bdp.cassandra.auth.DseAuthenticator authorizer: - AllowAllAuthorizer + com.datastax.bdp.cassandra.auth.DseAuthorizer roles_validity_in_ms: - 2000 + 120000 ...
cassandra.yaml changes
Internode encryption settings
Important: For security reasons, DSE 6.8 only allows the TLS encryption option protocol:server_encryption_options: ... protocol: TLS
See https://www.oracle.com/technetwork/java/javase/8u31-relnotes-2389094.html#newft for details.
Client encryption settings
Important: For security reasons, DSE 6.8 only allows the TLS encryption option protocol:client_encryption_options: ... protocol: TLS
See https://www.oracle.com/technetwork/java/javase/8u31-relnotes-2389094.html#newft for details.
-
- Start the node.
- Package
installations:
sudo service dse start
- Tarball
installations:
installation_dir/bin/dse cassandra
- Package
installations:
- Verify that the upgraded datacenter names match the
datacenter names in the keyspace schema definition:
- Get the node's datacenter
name:
nodetool status | grep "Datacenter" Datacenter: datacenter-name
- Verify that the node's datacenter name matches the datacenter name for a
keyspace:
cqlsh --execute "DESCRIBE KEYSPACE keyspace-name;" | grep "replication" CREATE KEYSPACE keyspace-name WITH replication = {'class': 'NetworkTopologyStrategy, 'datacenter-name': '3'};
- Get the node's datacenter
name:
- Review the logs for warnings, errors, and
exceptions:
grep -w 'WARNING\|ERROR\|exception' /var/log/cassandra/*.log
Warnings, errors, and exceptions are frequently found in the logs when starting an upgraded node. Some of these log entries are informational to help you execute specific upgrade-related steps. If you find unexpected warnings, errors, or exceptions, contact DataStax Support.Tip: Non standard log locations are configured in dse-env.sh. - Repeat the upgrade process on each node in the cluster following the recommended order.
- After the entire cluster upgrade is complete: upgrade
the SSTables on one node at a time or, when using racks, one rack at a time.Warning: Failure to upgrade SSTables when required results in a significant performance impact and increased disk usage and possible data loss. Upgrading is not complete until the SSTables are upgraded.
nodetool upgradesstables
Tip: Use the--jobs
option to set the number of SSTables that upgrade simultaneously. The default setting is 2, which minimizes impact on the cluster. Set to 0 to use all available compaction threads. DataStax recommends running theupgradesstables
command on one node at a time or when using racks, one rack at a time.Important: You can run theupgradesstables
command before all the nodes are upgraded as long as you run the command on only one node at a time or when using racks, one rack at a time. Runningupgradesstables
on too many nodes at once will degrade performance.
General post upgrade steps
After all nodes are upgraded:
- If you use the OpsCenter Repair Service, turn on the Repair Service.
- DSE 6.7 introduces, and enables by default, the DSE Metrics Collector, a diagnostics information aggregator used to help facilitate DSE problem resolution. For more information on the DSE Metrics Collector, or to disable metrics collection, see DataStax Enterprise Metrics Collector.
- Spark Jobserver uses DSE custom version 8.0.4.45. Ensure that applications use the compatible Spark Jobserver API from the DataStax repository.
Locking DSE package versions
If you have upgraded a DSE package installation, you can prevent future unintended upgrades.
RHEL yum installations
- Install
yum-versionlock
(one-time operation):sudo yum install yum-versionlock
- Lock the current DSE
version:
sudo yum versionlock dse-*
sudo yum versionlock clear
For details on the versionlock
command, see http://man7.org/linux/man-pages/man1/yum-versionlock.1.html.
Debian apt-get installations
sudo apt-mark hold dse-*
sudo apt-mark unhold dse-*
For details on the apt-mark command, see http://manpages.ubuntu.com/manpages/bionic/man8/apt-mark.8.html.