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From ramkrishna vasudevan <ramkrishna.s.vasude...@gmail.com>
Subject Re: Why Regionserver is not serving when I set the WAL trigger?
Date Sat, 10 Nov 2012 15:12:04 GMT
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 <yongyong313@gmail.com> 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
> 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
>

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