Dear Wiki user, You have subscribed to a wiki page or wiki category on "Lucene-hadoop Wiki" for change notification.
The following page has been changed by JimKellerman: http://wiki.apache.org/lucene-hadoop/Hbase/HbaseArchitecture The comment on the change is: Start documenting inter-process interactions ------------------------------------------------------------------------------ * [#tabletserver Tablet Server] * [#sstable SSTable] * [#metadata METADATA Table] + * [#ipc Inter-process Communication Messages] + * [#wireformat IPC Message Wire Format] + * [#ipcclientmaster Client to Master Messages] + * [#ipcclienttablet Client to Tablet Server Messages] + * [#ipcmastertablet Master to Tablet Server Messages] * [#clientlib Client Library] - * [#api API] + * [#api API] * [#other Other] * [#comments Comments] @@ -204, +209 @@ [[Anchor(chubby)]] = Distributed Lock Server - a ''Chubby'' clone = - * [:DistributedLockServer:see also Hadoop Distributed Lock Server] + [:DistributedLockServer:See the Hadoop Distributed Lock Server Project Page] * Uses 1. To ensure that there is at most one active master at any time 1. To store bootstrap location of Bigtable data @@ -380, +385 @@ * Each row stores approximately 1KB of data in memory * All events pertaining to each tablet are logged here (such as when a tablet server starts serving a tablet) + [[Anchor(ipc)]] + = Inter-process Communication Messages = + + Interactions betwen the client and master, the client and the tablet + server and between the master and tablet servers occur as messages + transferred over a socket connection. The following sections document + the general format of the messages, and the specific messages for each + interaction. + + [[Anchor(wireformat)]] + == IPC Message Wire Format == + + All IPC messages have the same basic format but differ in the details + of the operation being performed and the parameters that are + passed. The basic format of a message is: + + ||<:> '''Size''' ||<(> '''Description''' || + ||<:> byte ||<(> protocol version number || + ||<:> int ||<(> message type (op code) || + ||<:> int ||<(> number of parameters || + ||||<:> ''repeat the following for each parameter'' || + ||<:> int ||<(> parameter identifier || + ||<:> int ||<(> length of parameter value || + ||<:> byte[length] ||<(> parameter value || + + [[Anchor(ipcclientmaster)]] + == Client to Master Messages == + + [[Anchor(ipcclienttablet)]] + == Client to TabletServer Messages == + + [[Anchor(ipcmastertablet)]] + == Master to Tablet Server Messages == [[Anchor(clientlib)]] = Client Library = @@ -391, +429 @@ [[Anchor(api)]] - = API = + == API == {{{ CreateTable()
