[jira] [Resolved] (HBASE-5285) runtime exception -- cached an already cached block -- during compaction

["stack (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack resolved HBASE-5285.
--------------------------

    Resolution: Cannot Reproduce

Haven't see this in years.  Correct me if I am wrong.

> 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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