Re: HTrace

[Masatake Iwasaki]

Hi Biju,

> Where you able to use the graphDrawer.py script against the HTrace
> output. Attached is the output got from my test and didn't generate any
> image. Any thoughts why? Thanks

Your tracing output does not include spans whose parent is root (which has the 
ID 0x74ace).
I think the cause is that the test code did not initialized SpanReceiverHost 
properly
or you run the test code on multi-node environment.

Regards,
Masatake Iwasaki


(3/5/14, 16:41), Biju G.S Nair wrote:

Masatake,
     Where you able to use the graphDrawer.py script against the HTrace
output. Attached is the output got from my test and didn't generate any
image. Any thoughts why? Thanks in advance.



- Biju



On Wed, Mar 5, 2014 at 4:57 PM, Masatake Iwasaki <
iwasak...@oss.nttdata.co.jp> wrote:

Hi Biju,

The org.apache.hadoop.hbase.trace.SpanReceiverHost is available only in

the

server jar. If we intend to keep the client and server components in
separate jars this call need to be included in the client jar as well.

Thanks for your feedback!
I will take this into consideration on fixing docs.

Regards,
Masatake Iwasaki


(3/5/14, 11:51), Biju G.S Nair wrote:

Thanks Masatake.

The org.apache.hadoop.hbase.trace.SpanReceiverHost is available only in
the
server jar. If we intend to keep the client and server components in
separate jars this call need to be included in the client jar as well.





Thanks,
Biju
Tel#: 978-707-5066


On Wed, Mar 5, 2014 at 1:29 PM, Masatake Iwasaki <
iwasak...@oss.nttdata.co.jp> wrote:

  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