Dear All,

I used hbase 0.94.1 and implemented the test example of WAL trigger like:

public class WalTrigger extends BaseRegionObserver implements WALObserver{

public boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment>
ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws
IOException{
Configuration conf = new Configuration();
String key = logKey.toString();
String value = logEdit.toString();
String logRes = key + value;
HTable table = new HTable(conf,"log");
Put put = new Put(Bytes.toBytes(key));
put.add(Bytes.toBytes("logEntry"), null, Bytes.toBytes(value));
table.put(put);
return true;
}
public void postWALWrite(ObserverContext<WALCoprocessorEnvironment>
ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws
IOException{

}
}

However, when I inserted the tuples in HBase, it returns Exception in
thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException:
Failed after attempts=10, exceptions:
Sat Nov 10 15:58:14 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:15 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:16 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:17 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:19 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:21 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:25 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:29 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:37 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1
Sat Nov 10 15:58:54 CET 2012,
org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: Region is not
online: .META.,,1

at org.apache.hadoop.hbase.client.ServerCallable.withRetries(ServerCallable.java:183)
at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:205)
at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:120)
at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:626)
at org.apache.hadoop.hbase.catalog.MetaReader.fullScan(MetaReader.java:707)
at org.apache.hadoop.hbase.catalog.MetaReader.fullScan(MetaReader.java:183)
at org.apache.hadoop.hbase.catalog.MetaReader.tableExists(MetaReader.java:448)
at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:233)
at datageneraion.HBaseDataGenerator.createTable(HBaseDataGenerator.java:24)
at datageneraion.HBaseDataGenerator.main(HBaseDataGenerator.java:76)

By the way, I set in the hbase-site.xml file

<property>
<name>hbase.coprocessor.wal.classes</name>
<value>yonghu.waltrigger.WalTrigger</value>

Can anyone give me some advices?

Thanks!

Yong

Sorry i am not very sure if there is any link between the coprocessor and
region not online.
Pls check if your META region is online.

Regards
ram

On Sat, Nov 10, 2012 at 8:37 PM, yonghu <[EMAIL PROTECTED]> wrote:

> Dear All,
>
> I used hbase 0.94.1 and implemented the test example of WAL trigger like:
>
> public class WalTrigger extends BaseRegionObserver implements WALObserver{
>
>         public boolean
> preWALWrite(ObserverContext<WALCoprocessorEnvironment>
> ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws
> IOException{
>                 Configuration conf = new Configuration();
>                 String key = logKey.toString();
>                 String value = logEdit.toString();
>                 String logRes = key + value;
>                 HTable table = new HTable(conf,"log");
>                 Put put = new Put(Bytes.toBytes(key));
>                 put.add(Bytes.toBytes("logEntry"), null,
> Bytes.toBytes(value));
>                 table.put(put);
>                 return true;
>         }
>         public void postWALWrite(ObserverContext<WALCoprocessorEnvironment>
> ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws
> IOException{
>
>         }
> }
>
> However, when I inserted the tuples in HBase, it returns Exception in
> thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException:
> Failed after attempts=10, exceptions:
> Sat Nov 10 15:58:14 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:15 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:16 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:17 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:19 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:21 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:25 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:29 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:37 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
> Sat Nov 10 15:58:54 CET 2012,
> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
> org.apache.hadoop.hbase.NotServingRegionException:
> org.apache.hadoop.hbase.NotServingRegionException: Region is not
> online: .META.,,1
>
>         at
> org.apache.hadoop.hbase.client.ServerCallable.withRetries(ServerCallable.java:183)
>         at
> org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:205)
>         at
> org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:120)
>         at

The problem is caused by the code, as I create the configuration by
myself. The correct way is to use getConfiguration() method.

regards!

Yong

On Sat, Nov 10, 2012 at 4:12 PM, ramkrishna vasudevan
<[EMAIL PROTECTED]> wrote:
> Sorry i am not very sure if there is any link between the coprocessor and
> region not online.
> Pls check if your META region is online.
>
> Regards
> ram
>
> On Sat, Nov 10, 2012 at 8:37 PM, yonghu <[EMAIL PROTECTED]> wrote:
>
>> Dear All,
>>
>> I used hbase 0.94.1 and implemented the test example of WAL trigger like:
>>
>> public class WalTrigger extends BaseRegionObserver implements WALObserver{
>>
>>         public boolean
>> preWALWrite(ObserverContext<WALCoprocessorEnvironment>
>> ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws
>> IOException{
>>                 Configuration conf = new Configuration();
>>                 String key = logKey.toString();
>>                 String value = logEdit.toString();
>>                 String logRes = key + value;
>>                 HTable table = new HTable(conf,"log");
>>                 Put put = new Put(Bytes.toBytes(key));
>>                 put.add(Bytes.toBytes("logEntry"), null,
>> Bytes.toBytes(value));
>>                 table.put(put);
>>                 return true;
>>         }
>>         public void postWALWrite(ObserverContext<WALCoprocessorEnvironment>
>> ctx, HRegionInfo info, HLogKey logKey, WALEdit logEdit) throws
>> IOException{
>>
>>         }
>> }
>>
>> However, when I inserted the tuples in HBase, it returns Exception in
>> thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException:
>> Failed after attempts=10, exceptions:
>> Sat Nov 10 15:58:14 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:15 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:16 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:17 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:19 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:21 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:25 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:29 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:37 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not
>> online: .META.,,1
>> Sat Nov 10 15:58:54 CET 2012,
>> org.apache.hadoop.hbase.client.ScannerCallable@1ff92f5,
>> org.apache.hadoop.hbase.NotServingRegionException:
>> org.apache.hadoop.hbase.NotServingRegionException: Region is not