Hi Ilya Is there a plan to introduce it as an option of Ignite configuration? In that instead the boolean type I suggest to use the enum and reserve the ability to extend compressions algorithms in future
On Thu, Aug 23, 2018 at 1:09 PM, Ilya Kasnacheev <ilya.kasnach...@gmail.com> wrote: > Hello! > > I want to share with the developer community my compression prototype. > > Long story short, it compresses BinaryObject's byte[] as they are written > to Durable Memory page, operating on a pre-built dictionary. Typical > compression ratio is 0.4 (meaning 2.5x compression) using custom > LZW+Huffman. Metadata, indexes and primitive values are unaffected > entirely. > > This is akin to DB2's table-level compression[1] but independently > invented. > > On Yardstick tests performance hit is -6% with PDS and up to -25% (in > throughput) with In-Memory loads. It also means you can fit ~twice as much > data into the same IM cluster, or have higher ram/disk ratio with PDS > cluster, saving on hardware or decreasing latency. > > The code is available as PR 4295[2] (set IGNITE_ENABLE_COMPRESSION=true to > activate). Note that it will not presently survive a PDS node restart. > The impact is very small, the patch should be applicable to most 2.x > releases. > > Sure there's a long way before this prototype can have hope of being > included, but first I would like to hear input from fellow igniters. > > See also IEP-20[3]. > > 1. > https://www.ibm.com/support/knowledgecenter/en/SSEPGG_10. > 5.0/com.ibm.db2.luw.admin.dbobj.doc/doc/c0052331.html > 2. https://github.com/apache/ignite/pull/4295 > 3. > https://cwiki.apache.org/confluence/display/IGNITE/IEP- > 20%3A+Data+Compression+in+Ignite > > Regards, > > -- > Ilya Kasnacheev > -- Sergey Kozlov GridGain Systems www.gridgain.com
