Adding support for overriding cassandra backend retries and backoff factor (#251)

Author: keshavpeswani

deployment/terraform/main.tf

@@ -27,6 +27,9 @@ module "trace-indexer" {
   backend_memory_limit = "${var.traces["backend_memory_limit"]}"
   backend_memory_request = "${var.traces["backend_memory_request"]}"
   backend_jvm_memory_limit = "${var.traces["backend_jvm_memory_limit"]}"
+  cassandra_retries_max = "${var.traces["backend_cassandra_retries_max"]}"
+  cassandra_backoff_initial_ms = "${var.traces["backend_cassandra_backoff_initial_ms"]}"
+  cassandra_backoff_factor = "${var.traces["backend_cassandra_backoff_factor"]}"
 }
 
 module "trace-reader" {

deployment/terraform/trace-indexer/main.tf

@@ -40,6 +40,9 @@ data "template_file" "deployment_yaml" {
     graphite_host = "${var.graphite_hostname}"
     graphite_enabled = "${var.graphite_enabled}"
     cassandra_hostname = "${var.cassandra_hostname}"
+    cassandra_retries_max = "${var.cassandra_retries_max}"
+    cassandra_backoff_initial_ms = "${var.cassandra_backoff_initial_ms}"
+    cassandra_backoff_factor = "${var.cassandra_backoff_factor}"
     node_selecter_label = "${var.node_selector_label}"
     storage_backend_image = "${var.storage_backend_image}"
     indexer_image = "${var.indexer_image}"

deployment/terraform/trace-indexer/templates/deployment.yaml

@@ -31,6 +31,12 @@ spec:
         env:
         - name: "HAYSTACK_PROP_CASSANDRA_ENDPOINTS"
           value: "${cassandra_hostname}"
+        - name: "HAYSTACK_PROP_CASSANDRA_RETRIES_MAX"
+          value: "${cassandra_retries_max}"
+        - name: "HAYSTACK_PROP_CASSANDRA_BACKOFF_INITIAL_MS"
+          value: "${cassandra_backoff_initial_ms}"
+        - name: "HAYSTACK_PROP_CASSANDRA_BACKOFF_FACTOR"
+          value: "${cassandra_backoff_factor}"
         - name: "HAYSTACK_GRAPHITE_HOST"
           value: "${graphite_host}"
         - name: "HAYSTACK_GRAPHITE_PORT"

deployment/terraform/trace-indexer/variables.tf

@@ -7,6 +7,9 @@ variable "elasticsearch_hostname" {}
 variable "elasticsearch_port" {}
 variable "elasticsearch_template" {}
 variable "cassandra_hostname" {}
+variable "cassandra_retries_max" {}
+variable "cassandra_backoff_initial_ms" {}
+variable "cassandra_backoff_factor" {}
 variable "graphite_hostname" {}
 variable "graphite_port" {}
 variable "graphite_enabled" {}