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Teamwork Cloud uses Apache Cassandra, an open-source NoSQL distributed database. Before installing Teamwork Cloud, please follow the steps below to install Apache Cassandra.

To install Apache Cassandra

1. Install Apache Cassandra by executing the install_cassandra<version_number>_<os_version>.sh installation script.

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   sudo ./install_cassandra4x_centos_rhel_7.sh

   Info

   The script downloads and installs the necessary packages, Cassandra, and the Cassandra tools from the Apache Software Foundation repository, and creates the necessary firewall rules to allow proper operation both for a single node or a cluster installation. OpenJDK 8 will be installed with other packages, if you cannot use OpenJDK 8, you can install Oracle Java 8u202 instead. For instructions on how to do that, see Installing Oracle Java (optional). You can switch your setup to use OpenJDK 11 with Cassandra 4 alsoCassandra. Additionally, the installation script will install OpenJDK 11 and set the system environment to use the newer Java 11.

2. Start Apache Cassandra by executing the following command:

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   sudo systemctl start cassandra

3. Check if Apache Cassandra is running by executing the following command:

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   nodetool -h ::FFFF:127.0.0.1 status

   Note
   You can also use the following command: Code Block language bash theme DJango linenumbers true nodetool -Dcom.sun.jndi.rmiURLParsing=legacy status

   If Apache Cassandra is running, you should receive the output displayed below. If the service is fully operational, the first 2 characters of the last line are "UN", indicating that the node status is Up, and its state is Normal.

   
   

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   Datacenter: datacenter1 ======================= Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN 127.0.0.1 128.4 KB 256 100.0% ea3f99eb-c4ad-4d13-95a1-80aec71b750f rack1

   Note
   Wait for a few minutes until Cassandra starts for the first time before checking if it is running. If Cassandra has not started yet, you will get the error: "No nodes present in the cluster. Has this node finished starting up?" This means that you need to give Cassandra more time to start.

4. If Apache Cassandra is not running or if you used installation options other than the one described in this chapter, optionally configure Apache Cassandra.

Configuring Apache Cassandra (optional)

If you used other installation options and not the provided script or if Apache Cassandra does not start, configure it as described below.

To configure Apache Cassandra

1. Edit the cassandra.yaml file by executing the following command:

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   sudo nano /etc/cassandra/default.conf/cassandra.yaml

2. Find the following parameters related to the Cassandra node IP address and communication settings, and change them as shown below:

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   seeds: "192.168.130.10" listen_address: 192.168.130.10 broadcast_rpc_address: 192.168.130.10 rpc_address: 0.0.0.0

   • seeds - a comma-delimited list containing all of the seeds in the Cassandra cluster. Since our cluster consists of a single node, it contains only one entry - our IP address.
   • listen address - the IP address that Cassandra uses to listen for connections.
   • broadcast_rcp_address - the IP address used to broadcast to other Cassandra nodes in the cluster. This parameter may be commented. In such case, remove "#" and make sure there are no leading spaces.
   • rcp_address - when set to to 0.0.0.0, Cassandra listens to rpc requests on all interfaces.

3. Find the following parameters that control thresholds to ensure that the data being sent is processed properly, and change them as shown below:
   

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   commitlog_segment_size_in_mb: 192 read_request_timeout_in_ms: 1800000 range_request_timeout_in_ms: 1800000 write_request_timeout_in_ms: 1800000 cas_contention_timeout_in_ms: 1000 truncate_request_timeout_in_ms: 1800000 request_timeout_in_ms: 1800000 batch_size_warn_threshold_in_kb: 3000 batch_size_fail_threshold_in_kb: 5000

4. To ensure that the default commit log size is 8GB (recommended), uncomment the commitlog_total_space_in_mb parameter as show as below.
   

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   commitlog_total_space_in_mb: 8192

   Note
   Ensure that the partition where the commit log is installed has enough space to accommodate a commit log of 8GB.

5. To point the data to the appropriate locations, find the following parameters and change them as shown below:
   

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   data_file_directories: - /data/data commitlog_directory: /logs/commitlog hints_directory: /data/hints saved_caches_directory: /data/saved_caches

6. Start Apache Cassandra by executing the following command:

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   sudo systemctl start cassandra

7. Check if Apache Cassandra is running by executing the following command:

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   nodetool status

   If Apache Cassandra is running, you should receive the output displayed below. If the service is fully operational, the first 2 characters of the last line are "UN", indicating that the node status is Up, and its state is Normal.

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   Datacenter: datacenter1 ======================= Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN 127.0.0.1 128.4 KB 256 100.0% ea3f99eb-c4ad-4d13-95a1-80aec71b750f rack1

Configuring Cassandra JVM node (optional)

If you did not use the installation script or want to increase the RAM usage by Cassandra, make the following changes. Otherwise, these configuration changes are set automatically by the Cassandra installation script.

• By default, the maximum RAM usage for Cassandra is 8GB. To change the amount of RAM used by Cassandra, uncomment -Xms4G (min) and -Xmx4G (max) in the jvm-server.options file and specify their values.
• In the jvm11-server.options and jvm8-server.options files, comment all lines from"### CMS Settings" to "### G1 Settings".

• In the jvm11-server.options and jvm8-server.options files, uncomment the following lines:

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  #-XX:+UseG1GC #-XX:MaxGCPauseMillis=500

• In the jvm11-server.options and jvm8-server.options files, uncomment the following lines and set the values to the physical CPU core count (the values of both parameters should be the same):

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  #-XX:ParallelGCThreads=16 #-XX:ConcGCThreads=16

• In the jvm8-server.options file, comment all lines from "### GC logging options" to the end of the file.

• Synchronize CPU clocks on all Cassandra cluster nodes. Otherwise, you may encounter issues when creating an empty Cassandra cluster.

• When using cqlsh, use Python 3.6.0 or a later version. Python 2.7 series is no longer supported.
• In the logback.xml file, comment the "<appender-ref ref="ASYNCDEBUGLOG" />" line. This will increase Cassandra's performance by disabling the debug log.

Tuning Linux to improve Apache Cassandra performance

To improve Apache Cassandra performance

1. Open the sysctl.conf file by executing the following command:

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   sudo nano /etc/sysctl.conf

2. To configure the TCP settings, add the following tuning parameters to the file:

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   net.core.rmem_max=16777216 net.core.wmem_max=16777216 net.core.optmem_max=40960 net.core.default_qdisc=fq net.core.somaxconn=4096 net.ipv4.conf.all.arp_notify = 1 net.ipv4.tcp_keepalive_time=60 net.ipv4.tcp_keepalive_probes=3 net.ipv4.tcp_keepalive_intvl=10 net.ipv4.tcp_mtu_probing=1 net.ipv4.tcp_rmem=4096 12582912 16777216 net.ipv4.tcp_wmem=4096 12582912 16777216 net.ipv4.tcp_max_syn_backlog=8096 net.ipv4.tcp_slow_start_after_idle = 0 net.ipv4.tcp_tw_reuse = 1 vm.max_map_count = 1048575 vm.swappiness = 0 vm.dirty_background_ratio=5 vm.dirty_ratio=80 vm.dirty_expire_centisecs = 12000

3. To apply the setting without rebooting, execute the following command:

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   sudo sysctl -p

For more information about tuning Linux, see DSE 6.8 Administrator Guide.