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From Jean-Marc Spaggiari <jean-m...@spaggiari.org>
Subject Re: Problem When Prefetch META table
Date Tue, 10 Dec 2013 13:34:42 GMT
Hi Andrea,

Which version of HBase are you testing with?

JM


2013/12/10 Andrea <andrea.gandini.89@gmail.com>

> Hi, I encounter this problem:
>
> 13/12/10 13:25:15 WARN client.HConnectionManager$HConnectionImplementation:
> Encountered problems when prefetch META table:
> java.io.IOException: HRegionInfo was null or empty in Meta for usertable,
> row=usertable,user4300292263938371081,99999999999999
>         at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:170)
>         at
> org.apache.hadoop.hbase.client.MetaScanner.access$000(MetaScanner.java:54)
>         at
> org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:133)
>         at
> org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:130)
>         at
>
> org.apache.hadoop.hbase.client.HConnectionManager.execute(HConnectionManager
> .java:360)
>         at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:130)
>         at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:105)
>         at
>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.
> prefetchRegionCache(HConnectionManager.java:918)
>         at
>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.
> locateRegionInMeta(HConnectionManager.java:973)
>         at
>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.
> locateRegion(HConnectionManager.java:860)
>         at
>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.
> locateRegion(HConnectionManager.java:817)
>         at
>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.
> processBatchCallback(HConnectionManager.java:1507)
>         at
>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.
> processBatch(HConnectionManager.java:1392)
>         at
> org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:918)
>         at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:774)
>         at org.apache.hadoop.hbase.client.HTable.put(HTable.java:749)
>         at com.yahoo.ycsb.db.HBaseClient.update(HBaseClient.java:328)
>         at com.yahoo.ycsb.db.HBaseClient.insert(HBaseClient.java:357)
>         at com.yahoo.ycsb.DBWrapper.insert(DBWrapper.java:148)
>         at
> com.yahoo.ycsb.workloads.CoreWorkload.doInsert(CoreWorkload.java:461)
>         at com.yahoo.ycsb.ClientThread.run(Client.java:269)
>
> It will happen when, on a netowrk with one zookeeper, one master and one
> regionserver I try to load a lot of data. This is the number of operations
> before the error:
>
> 200 sec: 888708 operations; 7767.62 current ops/sec; [UPDATE
> AverageLatency(us)=27089963] [INSERT AverageLatency(us)=9738.99] [CLEANUP
> AverageLatency(us)=27089976]
>  210 sec: 893742 operations; 502.7 current ops/sec; [UPDATE
> AverageLatency(us)=14887298.5] [INSERT AverageLatency(us)=6937.27] [CLEANUP
> AverageLatency(us)=14887312.5]
>  221 sec: 928277 operations; 3226.97 current ops/sec; [UPDATE
> AverageLatency(us)=27006074] [INSERT AverageLatency(us)=8529.21] [CLEANUP
> AverageLatency(us)=27006089]
>  231 sec: 930079 operations; 180.18 current ops/sec;  [INSERT
> AverageLatency(us)=457.08]
> 13/12/10 13:25:13 WARN client.HConnectionManager$HConnectionImplementation:
> Encountered problems when prefetch META table: ...
>
> Does this depend on the number of thread in whereby I insert the data?
>
>

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