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From yeshwanth kumar <yeshwant...@gmail.com>
Subject Re: Unable to get data of znode /hbase/table/mytable.
Date Sun, 27 Apr 2014 16:43:06 GMT
hi ted,

i am using fuzzyrow filter while scanning a table.
my cluster is running on HBase 0.94.6-cdh4.5.0
but in my webapp i specified hbase 0.94.7. dependency.

even after changing the dependency i still see the same error.

thanks,
yeshwanth.




On Sun, Apr 27, 2014 at 10:03 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> Did the exception below happen when you were performing some query on the
> region server ?
>
> Can you tell us a bit more whether your query uses FilterList ?
>
> Thanks
>
>
> On Sun, Apr 27, 2014 at 9:28 AM, yeshwanth kumar <yeshwanth43@gmail.com
> >wrote:
>
> > hi jean,
> >
> > i am using HBase 0.94.6-cdh4.5.0
> >
> > i found this in regionservers log,
> >
> > org.apache.hadoop.hbase.io.HbaseObjectWritable
> > Error in readFields
> > java.lang.ClassCastException:
> > org.apache.hadoop.hbase.snapshot.HSnapshotDescription cannot be cast to
> > org.apache.hadoop.hbase.filter.Filter
> > at
> > org.apache.hadoop.hbase.filter.FilterList.readFields(FilterList.java:276)
> > at org.apache.hadoop.hbase.client.Scan.readFields(Scan.java:591)
> > at
> >
> >
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:689)
> > at org.apache.hadoop.hbase.ipc.Invocation.readFields(Invocation.java:127)
> > at
> >
> >
> org.apache.hadoop.hbase.ipc.HBaseServer$Connection.processData(HBaseServer.java:1313)
> > at
> >
> >
> org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:1228)
> > at
> >
> >
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:750)
> > at
> >
> >
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.doRunLoop(HBaseServer.java:541)
> > at
> >
> >
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:516)
> > at
> >
> >
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> > at
> >
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> > at java.lang.Thread.run(Thread.java:744)
> >
> > how can i fix this dependency issue.
> >
> >
> >
> >
> > On Fri, Apr 25, 2014 at 9:06 PM, yeshwanth kumar <yeshwanth43@gmail.com
> > >wrote:
> >
> > > hi jean,
> > >
> > > i haven't written any piece of code to workaround znode,
> > > one of my rest endpoint in webapp reads data from hbase.
> > > it is giving me empty set.
> > > all if found in the logs is
> > >
> > > Reading reply sessionid:0x145974472760023, packet:: clientPath:null
> > > serverPath:null finished:false header:: 42,4 replyHeader::
> > > 42,77309411972,-101 request:: '/hbase/table/NCSVs,F response::
> > > hconnection-0x145974472760023 Unable to get data of znode
> > > /hbase/table/NCSVs because node does not exist (not an error)
> > >
> > > this is what i found in zookeeper client
> > >
> > > *$[zk: localhost:2181(CONNECTED) 14] ls /hbase*
> > > *[splitlog, online-snapshot, unassigned, table94, root-region-server,
> rs,
> > > backup-masters, table, draining, master, shutdown, hbaseid]*
> > >
> > >
> > > -yeshwanth
> > >
> > >
> > > On Fri, Apr 25, 2014 at 8:18 PM, Jean-Marc Spaggiari <
> > > jean-marc@spaggiari.org> wrote:
> > >
> > >> Hi Yeshwanth,
> > >>
> > >> What is your webapp looking at the ZNode? If you should the Java
> client
> > >> and
> > >> not look at the ZNode. Not getting why it's looking there. Do yo
> uknow?
> > >>
> > >> JM
> > >>
> > >>
> > >> 2014-04-25 2:01 GMT-04:00 yeshwanth kumar <yeshwanth43@gmail.com>:
> > >>
> > >> > hi matteo,
> > >> >
> > >> > my problem isn't solved yet.
> > >> > webapp isn't reading data from hbase.
> > >> > all i see in logs is znode /hbase/table/mytable doesn't exist.
> > >> > but all my tables are present in /hbase/table94/
> > >> >
> > >> > so how can i fix this problem.
> > >> >
> > >> > thanks,
> > >> > yeshwanth
> > >> >
> > >> >
> > >> >
> > >> >
> > >> > On Tue, Apr 22, 2014 at 9:58 PM, Matteo Bertozzi <
> > >> theo.bertozzi@gmail.com
> > >> > >wrote:
> > >> >
> > >> > > that is already done by the server.
> > >> > > The ZooKeeperWatcher.java is using conf.get(
> > >> > > "zookeeper.znode.masterTableEnableDisable", "table94"));
> > >> > >
> > >> > > anyway, why are you looking at the znodes?
> > >> > > a client application should never look at the znodes.
> > >> > > The znodes are only carrying transient informations used for
> > >> coordination
> > >> > >
> > >> > > Matteo
> > >> > >
> > >> > >
> > >> > >
> > >> > > On Tue, Apr 22, 2014 at 9:20 AM, yeshwanth kumar <
> > >> yeshwanth43@gmail.com
> > >> > > >wrote:
> > >> > >
> > >> > > > hi matteo,
> > >> > > >
> > >> > > > how do i specify hbase znode to use /hbase/table94  instead
of
> > >> > > /hbase/table
> > >> > > >
> > >> > > > thanks
> > >> > > >
> > >> > > >
> > >> > > > On Tue, Apr 22, 2014 at 9:40 PM, Matteo Bertozzi <
> > >> > > theo.bertozzi@gmail.com
> > >> > > > >wrote:
> > >> > > >
> > >> > > > > On Tue, Apr 22, 2014 at 9:00 AM, yeshwanth kumar <
> > >> > > yeshwanth43@gmail.com
> > >> > > > > >wrote:
> > >> > > > >
> > >> > > > > > @matteo
> > >> > > > > > present znode is at /hbase/table where it is empty.
> > >> > > > > > where as all my tables are present in /hbase/table94
> > >> > > > > > now  webapp isn't reading the data from hbase.
> > >> > > > > >
> > >> > > > >
> > >> > > > > cdh 4.5.0 doesn't write in /hbase/table due to a compatibility
> > >> issue
> > >> > > > > /hbase/table94
> > >> > > > > is used.
> > >> > > > > (see HBASE-6710 for details)
> > >> > > > >
> > >> > > > > On Tue, Apr 22, 2014 at 6:56 PM, Matteo Bertozzi <
> > >> > > > theo.bertozzi@gmail.com
> > >> > > > > >wrote:
> > >> > > > >
> > >> > > > > >
> > >> > > > > > > /hbase/table94 is a "compatibility" znode
that replaces
> > >> > > /hbase/table
> > >> > > > > > > if you want more details take a look at HBASE-6710.
> > >> > > > > > >
> > >> > > > > > > what is the problem of looking into /hbase/table94
instead
> > of
> > >> > > > > > /hbase/table?
> > >> > > > > > >
> > >> > > > > > > Matteo
> > >> > > > > > >
> > >> > > > > > >
> > >> > > > > > >
> > >> > > > > > > On Tue, Apr 22, 2014 at 5:18 AM, yeshwanth
kumar <
> > >> > > > > yeshwanth43@gmail.com
> > >> > > > > > > >wrote:
> > >> > > > > > >
> > >> > > > > > > > Hi,
> > >> > > > > > > >
> > >> > > > > > > >
> > >> > > > > > > > i am running webapp written on jaxrs
framework which
> > >> performs
> > >> > > CRUD
> > >> > > > > > > > opereations on hbase.
> > >> > > > > > > >
> > >> > > > > > > > app was working fine till last week,
> > >> > > > > > > > now when i perform reading opeartion
 from hbase i don't
> > see
> > >> > any
> > >> > > > > data,
> > >> > > > > > i
> > >> > > > > > > > don't see any errors or exceptions but
i found this
> lines
> > in
> > >> > the
> > >> > > > log
> > >> > > > > > > >
> > >> > > > > > > > *""Unable to get data of znode /hbase/table/myTable
> > because
> > >> > node
> > >> > > > does
> > >> > > > > > not
> > >> > > > > > > > exist (not an error)"".*
> > >> > > > > > > >
> > >> > > > > > > > i followed this<
> > >> > > > > > > >
> > >> https://blog.cloudera.com/blog/2013/10/what-are-hbase-znodes/>
> > >> > > > > > > > cloudera
> > >> > > > > > > > article about znodes and this is what
i found,
> > >> > > > > > > >
> > >> > > > > > > > *$[zk: localhost:2181(CONNECTED) 14]
ls /hbase*
> > >> > > > > > > > *[splitlog, online-snapshot, unassigned,
table94,
> > >> > > > root-region-server,
> > >> > > > > > rs,
> > >> > > > > > > > backup-masters, table, draining, master,
shutdown,
> > hbaseid]*
> > >> > > > > > > >
> > >> > > > > > > > all the tables were present in /hbase/table94,
where as
> > >> > > > /hbase/table
> > >> > > > > is
> > >> > > > > > > > empty.
> > >> > > > > > > >
> > >> > > > > > > > i know what is the problem now,
> > >> > > > > > > > but i don't know how to solve it.
> > >> > > > > > > >
> > >> > > > > > > > can someone help me with this issue.
> > >> > > > > > > >
> > >> > > > > > > > Thanks,
> > >> > > > > > > > Yeshwanth
> > >> > > > > > > >
> > >> > > > > > >
> > >> > > > > >
> > >> > > > >
> > >> > > >
> > >> > >
> > >> >
> > >>
> > >
> > >
> >
>

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