diff --git a/README.md b/README.md index 89071e5..0cf09dd 100644 --- a/README.md +++ b/README.md @@ -1218,7 +1218,7 @@ Write-through is a slow overall operation due to the write operation, but subseq Source: Scalability, availability, stability, patterns

-In write-behind, tha application does the following: +In write-behind, the application does the following: * Add/update entry in cache * Asynchronously write entry to the data store, improving write performance @@ -1348,7 +1348,7 @@ TCP is a connection-oriented protocol over an [IP network](https://en.wikipedia. * Sequence numbers and [checksum fields](https://en.wikipedia.org/wiki/Transmission_Control_Protocol#Checksum_computation) for each packet * [Acknowledgement](https://en.wikipedia.org/wiki/Acknowledgement_(data_networks)) packets and automatic retransmission -If the sender does not receive a correct response, it will resend the packets. If there are multiple timeouts, the connection is dropped. TCP also implements [flow control](https://en.wikipedia.org/wiki/Flow_control_(data)) and [congestion control](https://en.wikipedia.org/wiki/Network_congestion#Congestion_control). These guarantees cause delays and generally results in less efficient transmission than UDP. +If the sender does not receive a correct response, it will resend the packets. If there are multiple timeouts, the connection is dropped. TCP also implements [flow control](https://en.wikipedia.org/wiki/Flow_control_(data)) and [congestion control](https://en.wikipedia.org/wiki/Network_congestion#Congestion_control). These guarantees cause delays and generally result in less efficient transmission than UDP. To ensure high throughput, web servers can keep a large number of TCP connections open, resulting in high memory usage. It can be expensive to have a large number of open connections between web server threads and say, a [memcached](#memcached) server. [Connection pooling](https://en.wikipedia.org/wiki/Connection_pool) can help in addition to switching to UDP where applicable.