Is that region offline?
Do a:
hbase> get ".META.", "TestTable,0001749889,1250092414985", {COLUMNS =>
"info"}.
If so, can you get its history so we can figure how it went offline? (See
region history in UI or grep it in master logs?)
St.Ack
On Fri, Aug 14, 2009 at 9:55 AM, llpind <[email protected]> wrote:
>
> Hey Stack, I tried the following command:
>
> hadoop-0.20.0/bin/hadoop jar hbase-0.20.0/hbase-0.20.0-test.jar
> randomWrite
> 10
>
> running a map/reduce job, it failed with the following exceptions in each
> node:
>
> org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to contact
> region server Some server for region , row '0001753186', but failed after
> 11
> attempts.
> Exceptions:
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
> org.apache.hadoop.hbase.client.RegionOfflineException: region offline:
> TestTable,0001749889,1250092414985
>
> at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getRegionLocationForRowWithRetries(HConnectionManager.java:995)
> at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.processBatchOfRows(HConnectionManager.java:1025)
> at
> org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:584)
> at org.apache.hadoop.hbase.client.HTable.put(HTable.java:450)
> at
>
> org.apache.hadoop.hbase.PerformanceEvaluation$RandomWriteTest.testRow(PerformanceEvaluation.java:497)
> at
>
> org.apache.hadoop.hbase.PerformanceEvaluation$Test.test(PerformanceEvaluation.java:406)
> at
>
> org.apache.hadoop.hbase.PerformanceEvaluation.runOneClient(PerformanceEvaluation.java:627)
> at
>
> org.apache.hadoop.hbase.PerformanceEvaluation$EvaluationMapTask.map(PerformanceEvaluation.java:194)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:356)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
>
> ================================================================
>
> This appears to be this issue:
>
> http://issues.apache.org/jira/browse/HBASE-1603
>
>
> Has this been fixed in .20? Thanks.
>
>
>
> stack-3 wrote:
> >
> > On Wed, Aug 12, 2009 at 8:58 AM, llpind <[email protected]> wrote:
> >
> >>
> >> Playing with the HBase perfomanceEval Class, but it seems to take a long
> >> time to run “sequentialWrite 2” (~20 minutes). If I simply emulate 1
> >> clients in a simple program, I can do 1 Million Puts in about 3 minutes
> >> (non
> >> mapred). The sequential write is writing 2 million with 2 clients.
> >> Please
> >> help in understanding how to use the performanceEvaluation Class.
> >>
> >
> > If the number of clients is > 1, unless you add the '--nomapred' (sp?)
> > argument, PE launches a mapreduce program of N tasks. Each task puts up
> a
> > client writing 1M rows (IIRC). Try N where N == number_of_map_slots and
> > see
> > what that does? N == 2 probably won't tell you much. You could also set
> > an
> > N > 1 and use the '--nomapred'. This will run PE clients in a distinct
> > thread. For small numbers of N, this can put up heavier loading than MR
> > with its setup and teardown cost.
> >
> > St.Ack
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/HBase-in-a-real-world-application-tp24920888p24975031.html
> Sent from the HBase User mailing list archive at Nabble.com.
>
>
