We should also leave 8 bytes of empty space for future changes. D.
On Aug 1, 2017, 6:41 PM, at 6:41 PM, Pavel Tupitsyn <ptupit...@apache.org> wrote: >Alexey, good idea. ODBC and JDBC could also benefit from this. > >On Tue, Aug 1, 2017 at 7:27 PM, Alexey Kuznetsov ><akuznet...@apache.org> >wrote: > >> Pavel, >> >> How about data compression? >> May be it make sense to add a byte with compression algorithm? >> 0 - none >> 1 - ZIP >> 2 - .... >> .... >> >> On Tue, Aug 1, 2017 at 11:10 PM, Pavel Tupitsyn ><ptupit...@apache.org> >> wrote: >> >> > Igniters, >> > >> > Below is a proposed design for thin client protocol [1] [2] socket >data >> > exchange format. >> > >> > * Values are little-endian >> > * Every request and response message starts with 4-byte length >(including >> > handshake) >> > * Ignite binary format is used for value serialization (via >> > GridBinaryMarshaller/BinaryWriter/BinaryReader). Ignite binary >protocol >> > has >> > to be implemented by clients anyway to work with cache values, so >it >> makes >> > sense to use for all data exchange. >> > >> > >> > 1) Socket connection is established on a port according >> > to ConnectorConfiguration.port >> > >> > 2) Handshake is performed. >> > Request: >> > int32 length = 8 // message length >> > byte opCode = 1 // handshake command >> > int16 verMajor >> > int16 verMinor >> > int16 verMaintenance >> > byte clientCode = 2 // client type code (odbc, jdbc, >platform) >> > >> > Response: >> > uint32 length = 1 >> > byte success >> > >> > 3) Execute command. Request starts with a command code, then goes >> > command-specific data. >> > For example, IgniteCache<Integer, String>.put(1, "foo") will look >like >> > this: >> > Request: >> > int16 opCode // OP_CACHE_GET >> > int32 cacheId // GridCacheUtils.cacheId >> > byte flags // skipStore, noRetry, etc >> > binobject key >> > >> > Response: >> > byte success >> > binobject value >> > >> > Where binobject corresponds to Ignite BinaryMarshaller format, >which is >> > produced by BinaryWriter.writeObject method. Integer will be >represented >> as >> > byte typeCode = 3 // GridBinaryMarshaller.INT >> > int32 value = 1 >> > >> > 4) Goto (3) >> > >> > >> > Comments are welcome. >> > >> > Pavel >> > >> > [1] >> > http://apache-ignite-developers.2346864.n4.nabble. >> com/Support-for-Ignite- >> > clients-in-any-language-thin-client-protocol-td20297.html >> > [2] https://issues.apache.org/jira/browse/IGNITE-5896 >> > >> >> >> >> -- >> Alexey Kuznetsov >>
