![]() ![]() ![]() Because the JVM (Java Virtual Machine) executes this operation automatically, all other operations go on hold, introducing latency into the program's operation. Oracle has also tackled the performance problem that came with Java garbage collection, or the built-in process within Java to periodically free up memory no longer in use. "You no longer have to tell the system how big each cache should be." "We're now pretty comfortable in telling our customers that a couple terabytes of memory is easily achievable," he said. "That would depend on the application itself," he said. Purdy said he did not know of an upper limit to a size of a data grid using this technique. Instead, the administrator can set aside some solid-state flash memory on one of the servers to act as an overflow buffer. ![]() "This is pushing Java into a new strata."Īlso thanks to flash support, this is also the first version of the software that doesn't require that the administrator set the size of the data grid beforehand. "We've extend our capacity for storing data beyond the RAM and onto the flash device," he said, noting that the use of flash does not incur a performance penalty. A server can be outfitted with essentially an unlimited amount of solid-state flash memory, which then can be appropriated by Coherence. The new release allows administrators to incorporate solid-state flash memory into a configuration, in effect eliminating the upper limit of the amount of memory that can be devoted to each cache. This limitation has largely been due to the amount of working memory that can be placed on each server. Today's larger deployments of Coherence tend to be about a quarter-terabyte in size, Purdy explained. Oracle has also tried to do away with the size limitations of Coherence caches. In addition, at least two separate working groups are endeavoring to build caching directly into the Java Enterprise Edition 7 specifications, namely the JSR-107 working group and a Red Hat submission of its Infinispan data grid technology. Peers include the open-source Memcache, VMware's GemStone, and Terracotta's Ehcache. Net-based applications.Ĭoherence is one of a growing number of products and open-source applications designed for building multi-server caches. ![]() It is also used by organizations as a fail-over mechanism, assuring that if one server, or even an entire data center, goes offline, the application and associated data stays operational on other nodes.Ĭoherence itself was written in Java and tuned for that language, but it also offers connectivity with C++ and. Using Coherence, an organization can reduce the amount of times data needs to be written back to or read back from storage, a process that can slow an application. Version 3.7 of Coherence, to be released Monday, includes more than 500 changes since the 3.6 version, which debuted last July.Īmong the changes are support for flash drives, which should ease the process of sizing caches, and streamlining garbage collection to reduce latency.Ĭoherence is Oracle's in-memory data grid software, which allows a single application or database to be spread across multiple Java application servers. "So we've made some pretty significant investments in making things easy to use." "One of the things we didn't do so well early on was make the technology easily usable," admitted Cameron Purdy, Oracle vice president of development. Faced with an increasingly competitive market for large-scale distributed data caches, Oracle has endeavored to make its own Coherence data grid software sprightlier and simpler to use. ![]()
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