HBASE-15216 Canary does not accept config params from command line (Vishal Khandelwal)

hbase-server/src/main/java/org/apache/hadoop/hbase/tool/Canary.java

@@ -76,6 +76,7 @@ import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
 import org.apache.hadoop.hbase.util.Pair;
 import org.apache.hadoop.hbase.util.ReflectionUtils;
 import org.apache.hadoop.hbase.util.RegionSplitter;
+import org.apache.hadoop.util.GenericOptionsParser;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
 
@@ -640,6 +641,8 @@ public final class Canary implements Tool {
     System.err.println("   -writeSniffing enable the write sniffing in canary");
     System.err.println("   -writeTable    The table used for write sniffing."
         + " Default is hbase:canary");
+    System.err
+        .println("   -D<configProperty>=<value> assigning or override the configuration params");
     System.exit(USAGE_EXIT_CODE);
   }
 
@@ -1184,7 +1187,13 @@ public final class Canary implements Tool {
 
   public static void main(String[] args) throws Exception {
     final Configuration conf = HBaseConfiguration.create();
+
+    // loading the generic options to conf
+    new GenericOptionsParser(conf, args);
+
     int numThreads = conf.getInt("hbase.canary.threads.num", MAX_THREADS_NUM);
+    LOG.info("Number of exection threads " + numThreads);
+
     ExecutorService executor = new ScheduledThreadPoolExecutor(numThreads);
 
     Class<? extends Sink> sinkClass =

src/main/asciidoc/_chapters/ops_mgt.adoc

@@ -94,6 +94,7 @@ Usage: bin/hbase org.apache.hadoop.hbase.tool.Canary [opts] [table1 [table2]...]
    -t <N>         timeout for a check, default is 600000 (milliseconds)
    -writeSniffing enable the write sniffing in canary
    -writeTable    The table used for write sniffing. Default is hbase:canary
+   -D<configProperty>=<value> assigning or override the configuration params
 ----
 
 This tool will return non zero error codes to user for collaborating with other monitoring tools, such as Nagios.