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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | 1x 1x 1x 1x 1x 1x 1x 1x 40013x 20004x 20004x 20004x 1x 1x 2x 1x 1x 1x 20004x 40012x 40012x 20004x 8x 8x 8x 8x 8x 8x 55x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 20004x 20004x 20004x 20003x 20003x 2000x 2000x 1x 20004x 20004x 200x 200x 200x 200x 20004x 20x 8x 8x 8x 8x 8x 1x 7x 1x 8x 8x 8x 8x 8x 1x | const Promise = require('bluebird'); const _ = require('lodash'); const util = require('util'); const fs = require('fs'); const path = require('path'); const jsonStream = require('JSONStream'); const debug = require('debug')('express-cassandra'); const importer = { buildTableQueryForDataRow(keyspace, tableInfo, row) { row = _.omitBy(row, (item) => (item === null)); let query = util.format('INSERT INTO "%s"."%s" ("%s") VALUES (?%s)', keyspace, tableInfo.name, _.keys(row).join('","'), _.repeat(',?', _.keys(row).length - 1)); let params = _.values(row); if (tableInfo.isCounterTable) { const primaryKeyFields = _.pick(row, tableInfo.primaryKeys); const otherKeyFields = _.omit(row, tableInfo.primaryKeys); const setQueries = _.map(_.keys(otherKeyFields), (key) => util.format('"%s"="%s" + ?', key, key)); const whereQueries = _.map(_.keys(primaryKeyFields), (key) => util.format('"%s"=?', key)); query = util.format('UPDATE "%s"."%s" SET %s WHERE %s', keyspace, tableInfo.name, setQueries.join(', '), whereQueries.join(' AND ')); params = _.values(otherKeyFields).concat(_.values(primaryKeyFields)); } params = _.map(params, (param) => { Iif (_.isPlainObject(param)) { if (param.type === 'Buffer') { return Buffer.from(param); } const omittedParams = _.omitBy(param, (item) => (item === null)); Object.keys(omittedParams).forEach((key) => { if (_.isObject(omittedParams[key]) && omittedParams[key].type === 'Buffer') { omittedParams[key] = Buffer.from(omittedParams[key]); } }); return omittedParams; } return param; }); return { query, params }; }, processTableImport(systemClient, fixtureDirectory, keyspace, table, batchSize) { return new Promise((resolve, reject) => { debug('=================================================='); debug(`Reading metadata for table: ${table}`); systemClient.metadata.getTable(keyspace, table) .then((tableInfo) => { Iif (!tableInfo) { resolve(); return; } const isCounterTable = _.some(tableInfo.columns, (column) => (column.type.code === 5)); if (isCounterTable) batchSize = 1; let primaryKeys = []; primaryKeys = primaryKeys.concat(_.map(tableInfo.partitionKeys, (item) => item.name)); primaryKeys = primaryKeys.concat(_.map(tableInfo.clusteringKeys, (item) => item.name)); tableInfo.isCounterTable = isCounterTable; tableInfo.primaryKeys = primaryKeys; let queryPromises = []; let queries = []; let processed = 0; debug(`Creating read stream from: ${table}.json`); const jsonfile = fs.createReadStream(path.join(fixtureDirectory, `${table}.json`), { encoding: 'utf8' }); const readStream = jsonfile.pipe(jsonStream.parse('*')); readStream.on('data', (row) => { processed++; const query = this.buildTableQueryForDataRow(keyspace, tableInfo, row); if (batchSize > 1) { queries.push(query); if (queries.length >= batchSize) { queryPromises.push(systemClient.batch(queries, { prepare: true })); queries = []; } } else { queryPromises.push(systemClient.execute(query.query, query.params, { prepare: true })); } const processPauseSize = (batchSize >= 10) ? batchSize * 10 : 100; if (processed % processPauseSize === 0) { readStream.pause(); Promise.all(queryPromises) .then(() => { queryPromises = []; readStream.resume(); }) .catch((err) => { reject(err); }); } if (processed % 1000 === 0) { debug(`Streaming ${processed} rows to table: ${table}`); } }); readStream.on('error', (err) => { reject(err); }); const startTime = Date.now(); readStream.on('end', () => { debug(`Streaming ${processed} rows to table: ${table}`); if (queries.length > 1) { queryPromises.push(systemClient.batch(queries, { prepare: true })); } else if (queries.length === 1) { queryPromises.push(systemClient.execute(queries[0].query, queries[0].params, { prepare: true })); } Promise.all(queryPromises) .then(() => { const timeTaken = (Date.now() - startTime) / 1000; const throughput = timeTaken ? processed / timeTaken : 0.00; debug(`Done with table, throughput: ${throughput.toFixed(1)} rows/s`); resolve(); }) .catch((err) => { reject(err); }); }); }) .catch((err) => { reject(err); }); }); }, }; module.exports = importer; |