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From Stuti Awasthi <stutiawas...@hcl.com>
Subject RE: Facing issues in Import tool
Date Wed, 31 Aug 2011 06:44:49 GMT
Hi Friends

I resolved this. Command should be :
./hadoop org.apache.hadoop.hbase.mapreduce.Import list /backup

Now it worked and imported my data from /backup to list table. :)

From: Stuti Awasthi
Sent: Wednesday, August 31, 2011 12:06 PM
To: user@hbase.apache.org
Subject: Facing issues in Import tool

I was trying export/import utility but facing some issues while importing. I have 2 cluster
of Hbase with Hadoop say A and B.
Here what I did :

Cluster A:

*         Created table 'list' in Hbase which is stored in /hbase in Hadoop

*         Exported table 'list' at /backup in Hadoop

*         Distcp '/backup' to cluster B at location /backup in Hadoop.

Cluster B : Now I have exported file of my table 'list' in other cluster B which I try to

*         Created table schema similar to 'list' with same name 'list' table in cluster B.

*         Tried to import data from  /backup to 'list' table.

Comand is:  "./hadoop org.apache.hadoop.hbase.mapreduce.Import /hbase/list /backup"

Here : /hbase/list is empty table named "list" in Hbase
                     /backup contains exported file from cluster A

Error I am getting is :
11/08/31 11:33:39 WARN client.HConnectionManager$HConnectionImplementation: Encountered problems
when prefetch META table:
org.apache.hadoop.hbase.TableNotFoundException: Cannot find row in .META. for table: /hbase/list,
        at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:136)
        at org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:95)
        at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.prefetchRegionCache(HConnectionManager.java:648)
        at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:702)
        at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:593)
        at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:558)
        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:172)
        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:146)
        at org.apache.hadoop.hbase.mapreduce.TableOutputFormat.setConf(TableOutputFormat.java:198)
        at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62)
        at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
        at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:768)
        at org.apache.hadoop.mapreduce.Job.submit(Job.java:432)
        at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:448)
        at org.apache.hadoop.hbase.mapreduce.Import.main(Import.java:124)
11/08/31 11:33:39 ERROR mapreduce.TableOutputFormat: org.apache.hadoop.hbase.TableNotFoundException:
11/08/31 11:33:39 INFO input.FileInputFormat: Total input paths to process : 1
11/08/31 11:33:40 INFO mapred.JobClient: Running job: job_201108302028_0005
11/08/31 11:33:41 INFO mapred.JobClient:  map 0% reduce 0%
11/08/31 11:33:52 INFO mapred.JobClient: Task Id : attempt_201108302028_0005_m_000000_0, Status

Scan .Meta. result :

hbase(main):002:0> scan '.META.'
ROW                                         COLUMN+CELL
list,,1314770593439.e054afd492290f53cc0a80 column=info:regioninfo, timestamp=1314770593490,
value=REGION => {NAME => 'list,,1314770593439.e054afd492290f53cc0a8060b5a69
60b5a697bb.                                7bb.', STARTKEY => '', ENDKEY => '', ENCODED
=> e054afd492290f53cc0a8060b5a697bb, TABLE => {{NAME => 'list', FAMILIES => [{N
                                            AME => 'info', BLOOMFILTER => 'NONE', REPLICATION_SCOPE
=> '0', COMPRESSION => 'NONE', VERSIONS => '3', TTL => '2147483647',
                                             BLOCKSIZE => '65536', IN_MEMORY => 'false',
BLOCKCACHE => 'true'}]}}
list,,1314770593439.e054afd492290f53cc0a80 column=info:server, timestamp=1314770593537, value=
list,,1314770593439.e054afd492290f53cc0a80 column=info:serverstartcode, timestamp=1314770593537,

How to correctly import it  any ideas ?



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