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From "Simon Dircks (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5285) runtime exception -- cached an already cached block -- during compaction
Date Thu, 26 Jan 2012 18:27:41 GMT
runtime exception -- cached an already cached block -- during compaction
------------------------------------------------------------------------

                 Key: HBASE-5285
                 URL: https://issues.apache.org/jira/browse/HBASE-5285
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.92.0
         Environment: hadoop-1.0 and hbase-0.92
18 node cluster, dedicated namenode, zookeeper, hbasemaster, and YCSB client machine. 
latest YCSB

            Reporter: Simon Dircks
            Priority: Trivial


#On YCSB client machine:
/usr/local/bin/java -cp "build/ycsb.jar:db/hbase/lib/*:db/hbase/conf/" com.yahoo.ycsb.Client
-load -db com.yahoo.ycsb.db.HBaseClient -P workloads/workloada -p columnfamily=family1 -p
recordcount=5000000 -s > load.dat

loaded 5mil records, that created 8 regions. (balanced all onto the same RS)

/usr/local/bin/java -cp "build/ycsb.jar:db/hbase/lib/*:db/hbase/conf/" com.yahoo.ycsb.Client
-t -db com.yahoo.ycsb.db.HBaseClient -P workloads/workloada -p columnfamily=family1 -p operationcount=5000000
-threads 10 -s > transaction.dat



#On RS that was holding the 8 regions above. 
2012-01-25 23:23:51,556 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: regionserver:60020-0x134f70a343101a0
Successfully transitioned node 162702503c650e551130e5fb588b3ec2 from RS_ZK_REGION_SPLIT to
RS_ZK_REGION_SPLIT
2012-01-25 23:23:51,616 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer:
java.lang.RuntimeException: Cached an already cached block
at org.apache.hadoop.hbase.io.hfile.LruBlockCache.cacheBlock(LruBlockCache.java:268)
at org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:276)
at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$ScannerV2.seekTo(HFileReaderV2.java:487)
at org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekTo(HalfStoreFileReader.java:168)
at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:181)
at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:111)
at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:83)
at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:1721)
at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:2861)
at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1432)
at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1424)
at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1400)
at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:3688)
at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:3581)
at org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:1771)
at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)
at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1325)
2012-01-25 23:23:51,656 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: regionserver:60020-0x134f70a343101a0
Attempting to transition node 162702503c650e551130e5fb588b3ec2 from RS_ZK_REGION_SPLIT to
RS_ZK_REGION_SPLIT

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