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 <[email protected]>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 < > [email protected]> 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 <[email protected]>: >> >> > 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 < >> [email protected] >> > >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 < >> [email protected] >> > > >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 < >> > > [email protected] >> > > > >wrote: >> > > > >> > > > > On Tue, Apr 22, 2014 at 9:00 AM, yeshwanth kumar < >> > > [email protected] >> > > > > >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 < >> > > > [email protected] >> > > > > >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 < >> > > > > [email protected] >> > > > > > > >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 >> > > > > > > > >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> > >
