Re: HTrace

[Masatake Iwasaki]

Hi Biju,

> Trying to understand the process to enable HTrace. Following is the change
> to hbase-site.xml
>    <property>
>      <name>hbase.trace.spanreceiver.localfilespanreceiver.filename</name>
>      <value>/var/log/hbase/htrace.out</value>
>    </property>

Please try configuration like below.::

  <property>
    <name>hbase.trace.spanreceiver.classes</name>
    <value>org.cloudera.htrace.impl.LocalFileSpanReceiver</value>
  </property>

  <property>
    <name>hbase.local-file-span-receiver.path</name>
    <value>/var/log/hbase/htrace.out</value>
  </property>

and add lines for receivers initialization to your client code before starting 
trace.::

  import org.apache.hadoop.hbase.trace.SpanReceiverHost;
  ...
  private SpanReceiverHost spanReceiverHost;
  ...
  spanReceiverHost = SpanReceiverHost.getInstance(conf);

I will file a JIRA to fix documentation later.


Regards,
Masatake Iwasaki




(3/5/14, 9:08), Biju G.S Nair wrote:

Trying to understand the process to enable HTrace. Following is the change
to hbase-site.xml
   <property>
     <name>hbase.trace.spanreceiver.localfilespanreceiver.filename</name>
     <value>/var/log/hbase/htrace.out</value>
   </property>

Following is a simple code to trace a get call

public static void main(String[] args) throws IOException {

            Configuration conf = HBaseConfiguration.create();

           TraceScope getSpan = Trace.startSpan("Gets", Sampler.ALWAYS);

     try{

           System.out.println("Is tracing on :"+Trace.isTracing());

           HTable table = new HTable(conf, "t1");

          Get get = new Get(Bytes.toBytes("r1"));

          Result res = table.get(get);

          System.out.println(res.toString());

          table.close();

          } catch(Exception e) {

                     getSpan.close();

          } finally {

         getSpan.close();

    }

}
Is something missed
?
No trace file is getting
generated
. Thanks in advance.

Thanks,
Biju