Recreate stream on SIGHUP event

lib/cartodb/backends/analysis.js

@@ -19,17 +19,31 @@ AnalysisBackend.prototype.setBatchConfig = function (options) {
 
 AnalysisBackend.prototype.setLoggerConfig = function (options) {
     var loggerConfig = options || {};
+
     loggerConfig.filename = loggerConfig.filename;
 
     this.loggerConfig = loggerConfig;
+
+    if (this.loggerConfig.filename) {
+        this.stream = fs.createWriteStream(this.loggerConfig.filename, { flags: 'a', encoding: 'utf8' });
+
+        process.on('SIGHUP', function () {
+            if (this.stream) {
+                this.stream.destroy();
+            }
+
+            this.stream = fs.createWriteStream(this.loggerConfig.filename, { flags: 'a', encoding: 'utf8' });
+        }.bind(this));
+    }
 };
 
 AnalysisBackend.prototype.create = function(analysisConfiguration, analysisDefinition, callback) {
     analysisConfiguration.batch.endpoint = this.batchConfig.endpoint;
     analysisConfiguration.batch.inlineExecution = this.batchConfig.inlineExecution;
     analysisConfiguration.batch.hostHeaderTemplate = this.batchConfig.hostHeaderTemplate;
+
     analysisConfiguration.logger = {
-        stream: this.loggerConfig.filename ? fs.createWriteStream(this.loggerConfig.filename) : process.stdout
+        stream: this.stream ? this.stream : process.stdout
     };
 
     camshaft.create(analysisConfiguration, analysisDefinition, callback);