jgit/org.eclipse.jgit.storage.dht.test at e38cf2078d22e2c902a373371382ac8d82268f2d - jgit

纯java实现的git操作库。

Shawn O. Pearce 0e1d5ad8f8 DHT: Drop leading hash digits from row keys Originally I put the first two digits of the object SHA-1 into the start of a row key to try and spread the load of objects around a DHT service. Unfortunately this tends to not work as well as I had hoped. Servers reading a repository need to contact every node in a DHT cluster if the cluster tries to evenly distribute the object rows. This is a lot of connections, especially if the cluster has many backend storage servers. If the library has an open connection limit (possibly due to JVM file descriptor limitations) it may need to open and close a lot of connections to access a repository, rather than being able to reuse the same connection to a handful of backend servers. This results in a lot of connection thrashing for some DHT type databases, and is inefficient. Some DHTs are able to operate even if part of the database space is currently unavailable. For example, a DHT service might assign some section of the key space to a node, and then fail that section over to another node when the primary is noticed as being offline. During that failover period that section of the key space is not available, but other sections hosted by other backends are still ready for service. Spreading keys all over the cluster makes it likely that any single backend being temporarily down means the entire cluster is down, rather than only some. This is a massive schema change, but it should improve relability and performance for any DHT system. Change-Id: I6b65bfb4c14b6f7bd323c2bd0638b49d429245be Signed-off-by: Shawn O. Pearce <spearce@spearce.org>		14 years ago
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.settings	Store Git on any DHT	14 years ago
META-INF	Prepare 1.1.0 builds	14 years ago
tst/org/eclipse/jgit/storage/dht	DHT: Drop leading hash digits from row keys	14 years ago
.classpath	Store Git on any DHT	14 years ago
.gitignore	Store Git on any DHT	14 years ago
.project	Store Git on any DHT	14 years ago
build.properties	Store Git on any DHT	14 years ago
org.eclipse.jgit.storage.dht--All-Tests.launch	Store Git on any DHT	14 years ago
plugin.properties	Remove incubation marker	14 years ago
pom.xml	Prepare 1.1.0 builds	14 years ago