cassandra write performance tuning

partition./dev/sdb2. The block of the log volume must be equal to/dev/sdb1mke2fs–o journal_dev–b 1024/dev/sdb25,/dev/sdb2 as the/DEV/SDB1 log volume. Tune2fs–j–j DEVICE=/DEV/SDB2/DEV/SDB1 9. Close the recording file system atime:For web site files, frequent modification of atime is meaningless and can affect performance Mount–o Remount,noatime DEVICE10, modify the file log submission time:The default is 5 seconds to commit the log, and modifying

replace its function in a short period of time. So a slightly more important server or application system, there will be at least one backup for the exception of the time can be quickly replaced to provide services.For a database, the primary and standby configuration is a very common design idea. For MySQL, it can be said that there is a natural advantage to achieve this function, because its Replication function is widely used in practical applications to achieve the main configuration of the

servers through data segmentation solves both write performance bottlenecks and, once again, the scalability of the entire database cluster. Whether it is through vertical slicing or horizontal slicing, the system is less likely to experience bottlenecks. Especially when we use the vertical and horizontal combination of the segmentation method, in theory will no longer encounter the expansion bottleneck.

deployment of one serverØ Deploy multiple Web serversØweb Load Balancing-f5Ø data read/write separationØ Synchronous/asynchronous computation between various applications using Message QueuingØ Select the appropriate communication mode between applications, communication protocolØweb distributed, distributed application, distributed dataØ distributed nodes using high-performance servers, small fleet, suppl

keyonlyfilter. This reduces network traffic. Turn Off Wal on puts When you put some non-important data, you can set writetowal (false) to further improve the write performance. Writetowal (false) will discard Wal log writing during put. The risk is that when the regionserver goes down, the data you put may be lost and cannot be recovered. Enable bloom Filter The bloom filter improves the read operation

in the memory and copy the logs to the hard disk when the system is disabled, when you run a laptop or mobile device with syslog enabled, ramlog can help you improve the life of your system battery or flash drive on your mobile device. One benefit of using ramlog is that, there is no need to worry that a daemon sends a message to syslog every 30 seconds. In the past, the hard disk must be running at any time, which is not good for hard disks and batteries. 19. Package and

log on Elasticsearch 2. Using the Jstat command 3. Generate Memory Dump The first article: in the ES profile elasticsearch.yml has the related properties can be configured, about the purpose of each property here is of course not complete. The second: The Jstat command helps us to look at the usage of each area in the JVM heap and the time-consuming situation of GC. Article three: The final approach is to dump the JVM's heap space into a file, essentially a snapshot of the JVM heap space. To le

SQL Server Performance Tuning 3 (Index) MaintenanceHeat1 reviews Brook Stream GrassSQL Server Performance Tuning 3 (Index) MaintenanceObjectiveThe previous article describes how to improve the query performance of a database by building an index, which is really just the be

This is a creation in Article, where the information may have evolved or changed. The main thing to be told is the Http,websocket test and some ways to tune the Go program. Divided into the following sections: I. Httptest TEST PACKAGE Two. Performance testing Three. How to use parametric analysis and tuning procedures Four. Real-time monitoring of tuning in oper

Spark Performance Tuning Series catalog: General Tuning Performance tuning to allocate more resources in real-world projects Performance tuning to adjust parallelism in real projects

PrefaceA project in the development, testing, on-line, then the size of the user is still relatively small, so just on-line projects are generally stable performance. However, with the passage of time, the increase in the number of users, the increase in QPS and other factors will cause the project slowly show a half-day unresponsive situation. In the previous work also happened to encounter this process, at that time, the project carried out a lot of

, the smaller the number of buffer connections, and the larger the buffer becomes.13.5Tuning Core buffer size (UDP)AdjustmentUDP BuffersizeA. Adjust the bdp/#connections buffer A in the/etc/sysctl.conf file.The Input/reader in Bytes receives the data net.core.rmem_default the default value Net.core.rmem_max the maximum value B.Output/write in Bytes sends data Net.core.wmem_default Net.core.wmem_max B. Reload/etc/sysctl.conf sysctl–p13.6

An outline that is roughly written in the optimization content of the physical design and logical design of the DB, mainly physical design, logical design introduction of the content is not much, the outline of the physical structure design and example optimization of organic combination of the logical structure design and application adjustment together ... Oracle Performance Tuning Guidance outline Desi

not offline, because of the risk, so the system is more and more complex, not only maintenance difficulties, system performance is getting worse) system architecture and implementation of the performance impact: A Web application is naturally inseparable from the application (Web Applic ation) and Web application Server (Web server), Web server We control the tu