{"id":1991,"date":"2012-12-14T00:06:27","date_gmt":"2012-12-14T05:06:27","guid":{"rendered":"http:\/\/hstore.cs.brown.edu\/?page_id=1991"},"modified":"2013-01-05T15:44:07","modified_gmt":"2013-01-05T20:44:07","slug":"markovupdate","status":"publish","type":"page","link":"https:\/\/hstore.cs.brown.edu\/documentation\/system-procedures\/markovupdate\/","title":{"rendered":"@MarkovUpdate"},"content":{"rendered":"

\u00ab<\/B> @LoadMultipartitionTable<\/a><\/div>
@NoOp<\/a> \u00bb<\/B><\/div>
<\/div><\/p>\n

@MarkovUpdate<\/h2>\n

This system procedure will cause every HStoreSite in the cluster to recompute the probabilities of their transaction prediction models<\/a>. If the the save_to_file<\/tt> input parameter is set to true, then the procedure will write out the updated Markov models to a random file in the HStoreSite’s global.temp_dir<\/a>.<\/p>\n

You can have the BenchmarkController invoke this procedure automatically after the warm-up period of a benchmark by passing in the markov.recompute_warmup<\/tt> parameter, or after the entire benchmark run by passing in the the markov.recompute_end<\/tt> parameter. This will automatically retrieve the written files and combine them into a single MarkovGraphsContainer<\/a> file that can then be loaded into the system.<\/p>\n

Input Parameters<\/h3>\n\n\n\n
Name<\/th>\nType<\/th>\nDescription<\/th>\n<\/tr>\n
SAVE_TO_FILE<\/td>\nboolean<\/td>\nWhether the procedure should write out the update Markov models to a temporary file on disk.<\/td>\n<\/tr>\n<\/table>\n

Return Values<\/h3>\n\n\n\n\n\n\n
Name<\/th>\nType<\/th>\nDescription<\/th>\n<\/tr>\n
SITE<\/td>\nInteger<\/td>\nThe id of the site that recomputed its models.<\/td>\n<\/tr>\n
PARTITION<\/td>\nInteger<\/td>\nThe id of the partition that recomputed its models.<\/td>\n<\/tr>\n
OUTPUTFILE<\/td>\nString<\/td>\nThe path to file that the HStoreSite saved its updated Markov models for this partition. If save_to_file<\/tt> is false, then this field will be null.<\/td>\n<\/tr>\n
ISGLOBAL<\/td>\nInteger<\/td>\nWhether or not the Markov models are global (i.e., they are not partitioned with a decision tree). (1 = TRUE, 0 = FALSE)<\/td>\n<\/tr>\n<\/table>\n

Java Example<\/h3>\n\n
Client client =<\/span> ClientFactory.createClient<\/span>(<\/span>)<\/span>;<\/span>\nclient =<\/span> client.createConnection<\/span>(<\/span>hostname, port)<\/span>;<\/span>\nClientResponse cresponse =<\/span> client.callProcedure<\/span>(<\/span>"@MarkovUpdate"<\/span>, 1<\/span>)<\/span>;<\/span><\/pre><\/td><\/tr><\/table><\/div>\n\n
Command-Line Example<\/h3>\n\n
hstore><\/span> EXEC @<\/span>MarkovUpdate 1<\/span><\/pre><\/td><\/tr><\/table><\/div>\n\n
\u00ab<\/B> @LoadMultipartitionTable<\/a><\/div> 
@NoOp<\/a> \u00bb<\/B><\/div>
<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"
@MarkovUpdate This system procedure will cause every HStoreSite in the cluster to recompute the probabilities of their transaction prediction models. If the the save_to_file input parameter is set to true, then the procedure will write out the updated Markov models to a random file in the HStoreSite’s global.temp_dir. You can have the BenchmarkController invoke this […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":1891,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/pages\/1991"}],"collection":[{"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/comments?post=1991"}],"version-history":[{"count":6,"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/pages\/1991\/revisions"}],"predecessor-version":[{"id":2039,"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/pages\/1991\/revisions\/2039"}],"up":[{"embeddable":true,"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/pages\/1891"}],"wp:attachment":[{"href":"https:\/\/hstore.cs.brown.edu\/wp-json\/wp\/v2\/media?parent=1991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}