The line cat/proc/swaps in the /etc/fstab file should show NO entries. If your company policies or production environment requires swap to be on for other processes, you must ensure that the Cassandra process is not swapped out at any time.
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Best pgp application cassandra install#
If jemalloc is not installed, run the following command to install it from epel:Īpache Cassandra recommends that swap is disabled.Run the command rpm -q jemalloc to check if jemalloc is installed.If you are using another Linux distribution, consult your system administrator. The following commands apply for Red Hat 7.x. Perform the following procedures to ensure that each Cassandra machine meets the basic tuning requirements. Is swap disabled? : true, Address space adequate? : true, nofile limit adequate? : false, nproc limit adequate? : false WARN Cassandra server running in degraded mode. WARN jemalloc shared library could not be preloaded to speed up memory allocations. Increase RLIMIT_MEMLOCK or run Cassandra as root. This can result in part of the JVM being swapped out, especially with mmapped I/O enabled. These are examples of warnings for a misconfigured Cassandra host: WARN Unable to lock JVM memory (ENOMEM). This guide refers to this user account as cassandra_user.Ĭassandra executes basic performance and tuning checks at startup, and it writes warning messages to the console and to the system log file when issues are found.This user account must own all Cassandra related files, and it must be used to run the Cassandra process.You must create a specific UNIX user account for the Cassandra database.You must also perform a health check of the clock drift between nodes on a regular basis. The clock synchronization requires the use of a time service, such as NTP (Network Time Protocol), to ensure that the time is synchronized across all machines in the cluster. Failure to start or configure the machines correctly.The clocks of the system across all Cassandra cluster machines and the clocks of all client machines (API Gateway hosts) must be synchronized to one (1) millisecond precision.įailing to synchronize the clocks will result in: Follow the best practices in this section to achieve a stable Apache Cassandra environment, and to prevent data integrity and performance issues.Ĭomplete all of these tasks before you start Apache Cassandra.