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From: saurabh chhajed <schhajed.iet@gmail.com>
Date: Mon, 16 Sep 2013 08:05:16 +0530
Message-ID: 
 <CAKYEBfwzm0-U9O0fysayNmcVUd0p90evbGMmRizS8n29WjuDag@mail.gmail.com>
Subject: Re: SequenceFileReadDemo issue
To: user@hadoop.apache.org
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--001a11c3509624035a04e6770fc1
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Hi,

Can you look at this please, this might help you --

http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/TestSequenceFile.java?view=markup


Thanks,



On Mon, Sep 16, 2013 at 7:48 AM, kun yan <yankunhadoop@gmail.com> wrote:

> Hi all when i read  SequenceFIle occur exception
>
> Exception in thread "main" java.lang.RuntimeException:
> java.lang.NoSuchMethodException:
> org.apache.hadoop.io.SequenceFile$Reader.<init>()
>  at
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:128)
> at
> com.yanbit.hadoop.filesystem.sequence.SequenceFileReadDemo.main(SequenceFileReadDemo.java:24)
> Caused by: java.lang.NoSuchMethodException:
> org.apache.hadoop.io.SequenceFile$Reader.<init>()
> at java.lang.Class.getConstructor0(Unknown Source)
>  at java.lang.Class.getDeclaredConstructor(Unknown Source)
> at
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:122)
>  ... 1 more
>
> follow is my source code
>
> public class SequenceFileReadDemo {
>     public static void main(String[] args) throws IOException {
>  String uri = args[0];// /sequence/sequencefile
> Configuration conf = new Configuration();
> conf.set("fs.defaultFS", "hdfs://hydra0001:8020");
>  FileSystem fs = FileSystem.get(conf);
> Path path = new Path(uri);
> SequenceFile.Reader reader = null;
>
> try {
>     reader = new SequenceFile.Reader(fs, path, conf);
>     Writable key = (Writable) ReflectionUtils.newInstance(
>      reader.getClass(), conf);
>     Writable value = (Writable) ReflectionUtils.newInstance(
>      reader.getValueClass(), conf);
>     long position = reader.getPosition();
>     while (reader.next(key,value)) {
>         String syncSeen = reader.syncSeen() ? "*" : "";
>         System.out.printf("[%s%s]\t%s\t%s\n",  position,  syncSeen,  key,
>  value);
>         position = reader.getPosition(); // beginning of next record
>     }
> } finally {
>     IOUtils.closeStream(reader);
>  }
>     }
> }
>
> --
>
> In the Hadoop world, I am just a novice, explore the entire Hadoop
> ecosystem, I hope one day I can contribute their own code
>
> YanBit
> yankunhadoop@gmail.com
>
>

--001a11c3509624035a04e6770fc1
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi,<div><br></div><div>Can you look at this please, this m=
ight help you --</div><div><br></div><div><a href=3D"http://svn.apache.org/=
viewvc/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/jav=
a/org/apache/hadoop/io/TestSequenceFile.java?view=3Dmarkup">http://svn.apac=
he.org/viewvc/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/t=
est/java/org/apache/hadoop/io/TestSequenceFile.java?view=3Dmarkup</a><br>

</div><div><br></div><div><br></div><div>Thanks,</div><div><br></div></div>=
<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Mon, Sep 1=
6, 2013 at 7:48 AM, kun yan <span dir=3D"ltr">&lt;<a href=3D"mailto:yankunh=
adoop@gmail.com" target=3D"_blank">yankunhadoop@gmail.com</a>&gt;</span> wr=
ote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>Hi all when i read =A0=
SequenceFIle occur exception=A0</div><div><br></div><div><div>Exception in =
thread &quot;main&quot; java.lang.RuntimeException: java.lang.NoSuchMethodE=
xception: org.apache.hadoop.io.SequenceFile$Reader.&lt;init&gt;()</div>


<div><span style=3D"white-space:pre-wrap">	</span>at org.apache.hadoop.util=
.ReflectionUtils.newInstance(ReflectionUtils.java:128)</div><div><span styl=
e=3D"white-space:pre-wrap">	</span>at com.yanbit.hadoop.filesystem.sequence=
.SequenceFileReadDemo.main(SequenceFileReadDemo.java:24)</div>


<div>Caused by: java.lang.NoSuchMethodException: org.apache.hadoop.io.Seque=
nceFile$Reader.&lt;init&gt;()</div><div><span style=3D"white-space:pre-wrap=
">	</span>at java.lang.Class.getConstructor0(Unknown Source)</div><div>
<span style=3D"white-space:pre-wrap">	</span>at java.lang.Class.getDeclared=
Constructor(Unknown Source)</div><div><span style=3D"white-space:pre-wrap">=
	</span>at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUti=
ls.java:122)</div>


<div><span style=3D"white-space:pre-wrap">	</span>... 1 more</div></div><di=
v><br></div><div>follow is my source code=A0</div><div><br></div><div>publi=
c class SequenceFileReadDemo {</div><div>=A0 =A0 public static void main(St=
ring[] args) throws IOException {</div>


<div><span style=3D"white-space:pre-wrap">	</span>String uri =3D args[0];//=
 /sequence/sequencefile</div><div><span style=3D"white-space:pre-wrap">	</s=
pan>Configuration conf =3D new Configuration();</div><div><span style=3D"wh=
ite-space:pre-wrap">	</span>conf.set(&quot;fs.defaultFS&quot;, &quot;hdfs:/=
/hydra0001:8020&quot;);</div>


<div><span style=3D"white-space:pre-wrap">	</span>FileSystem fs =3D FileSys=
tem.get(conf);</div><div><span style=3D"white-space:pre-wrap">	</span>Path =
path =3D new Path(uri);</div><div><span style=3D"white-space:pre-wrap">	</s=
pan>SequenceFile.Reader reader =3D null;</div>


<div><br></div><div><span style=3D"white-space:pre-wrap">	</span>try {</div=
><div><span style=3D"white-space:pre-wrap">	</span> =A0 =A0reader =3D new S=
equenceFile.Reader(fs, path, conf);</div><div><span style=3D"white-space:pr=
e-wrap">	</span> =A0 =A0Writable key =3D (Writable) ReflectionUtils.newInst=
ance(</div>


<div><span style=3D"white-space:pre-wrap">	</span> =A0 =A0<span style=3D"wh=
ite-space:pre-wrap">	</span>reader.getClass(), conf);</div><div><span style=
=3D"white-space:pre-wrap">	</span> =A0 =A0Writable value =3D (Writable) Ref=
lectionUtils.newInstance(</div>


<div><span style=3D"white-space:pre-wrap">	</span> =A0 =A0<span style=3D"wh=
ite-space:pre-wrap">	</span>reader.getValueClass(), conf);</div><div><span =
style=3D"white-space:pre-wrap">	</span> =A0 =A0long position =3D reader.get=
Position();</div>


<div><span style=3D"white-space:pre-wrap">	</span> =A0 =A0while (reader.nex=
t(key,value)) {</div><div><span style=3D"white-space:pre-wrap">	</span> =A0=
 =A0 =A0 =A0String syncSeen =3D reader.syncSeen() ? &quot;*&quot; : &quot;&=
quot;;</div>
<div><span style=3D"white-space:pre-wrap">	</span> =A0 =A0 =A0 =A0System.ou=
t.printf(&quot;[%s%s]\t%s\t%s\n&quot;, =A0position, =A0syncSeen, =A0key, =
=A0value);=A0</div><div><span style=3D"white-space:pre-wrap">	</span> =A0 =
=A0 =A0 =A0position =3D reader.getPosition(); // beginning of next record</=
div>


<div><span style=3D"white-space:pre-wrap">	</span> =A0 =A0}</div><div><span=
 style=3D"white-space:pre-wrap">	</span>} finally {</div><div><span style=
=3D"white-space:pre-wrap">	</span> =A0 =A0IOUtils.closeStream(reader);</div=
>
<div><span style=3D"white-space:pre-wrap">	</span>}</div><div>=A0 =A0 }</di=
v><div>}</div><span class=3D"HOEnZb"><font color=3D"#888888"><div><br></div=
>-- <br><div dir=3D"ltr"><br><div>In the Hadoop world, I am just a novice, =
explore the entire Hadoop ecosystem, I hope one day I can contribute their =
own code</div>


<div>=A0</div><div>YanBit</div><div><a href=3D"mailto:yankunhadoop@gmail.co=
m" target=3D"_blank">yankunhadoop@gmail.com</a></div><div><br></div></div>
</font></span></div>
</blockquote></div><br></div>

--001a11c3509624035a04e6770fc1--