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https://issues.apache.org/jira/browse/HBASE-3466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13193491#comment-13193491
]
Zhihong Yu commented on HBASE-3466:
-----------------------------------
Since the issue can be reproduced, can you include cacheKey (and cb) in the
exception message ?
{code}
CachedBlock cb = map.get(cacheKey);
if(cb != null) {
throw new RuntimeException("Cached an already cached block");
}
{code}
Thanks
> runtime exception -- cached an already cached block -- during compaction
> ------------------------------------------------------------------------
>
> Key: HBASE-3466
> URL: https://issues.apache.org/jira/browse/HBASE-3466
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.0
> Environment: ubuntu 9.10, kernel 2.6.31-14-generic SMP 8-core with
> hyperthreading
> Reporter: M. C. Srivas
> Priority: Critical
>
> Happened while running ycsb against a single RS. BlockSize was set to 64M to
> tickle more splits. No compression, and replication factor set to 1.
>
> I noticed that https://issues.apache.org/jira/browse/HBASE-2455 applied to
> 0.20.4, so opened this new one (didn't check to see if the code was the same
> in 0.20.4 and 0.90.0)
> YCSB was run as follows:
> java -mx3000m -cp conf/:build/ycsb.jar:db/hbase/lib/* com.yahoo.ycsb.Client
> -t -db com.yahoo.ycsb.db.HBaseClient -P workloads/workloada -p
> columnfamily=family -p operationcount=10000000 -s -threads 30 -target 30000
> workloada was modified to do 1 billion records:
> ----------
> recordcount=1000000000
> operationcount=1000
> workload=com.yahoo.ycsb.workloads.CoreWorkload
> readallfields=true
> readproportion=0.5
> updateproportion=0.4
> scanproportion=0
> insertproportion=0.1
> requestdistribution=zipfian
> ---------------
> Relevant portions from the RS's log:
> 2011-01-23 10:48:20,719 INFO
> org.apache.hadoop.hbase.regionserver.SplitTransaction
> [regionserver60020.compactor]: Starting split of region
> usertable,,1295808232386.44386ab6079bd5b497a6de3ab95e850c.
> 2011-01-23 10:48:20,788 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.compactor]: Renaming flushed file at
> maprfs:/hbase/usertable/44386ab6079bd5b497a6de3ab95e850c/.tmp/3202441284831392385
> to
> maprfs:/hbase/usertable/44386ab6079bd5b497a6de3ab95e850c/family/1800354539520698957
> 2011-01-23 10:48:20,791 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.compactor]: Added
> maprfs:/hbase/usertable/44386ab6079bd5b497a6de3ab95e850c/family/1800354539520698957,
> entries=10943, sequenceid=128924, memsize=3.4m, filesize=1.5m
> 2011-01-23 10:48:20,792 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [regionserver60020.compactor]: Closed
> usertable,,1295808232386.44386ab6079bd5b497a6de3ab95e850c.
> 2011-01-23 10:48:20,828 INFO org.apache.hadoop.hbase.catalog.MetaEditor
> [regionserver60020.compactor]: Offlined parent region
> usertable,,1295808232386.44386ab6079bd5b497a6de3ab95e850c. in META
> 2011-01-23 10:48:20,856 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [perfnode15.perf.lab,60020,1295807975391-daughterOpener=89e0f70da1e5ce2d5c4024ca6cc1addb]:
> Onlined usertable,,1295808500713.89e0f70da1e5ce2d5c4024ca6cc1addb.; next
> sequenceid=128925
> 2011-01-23 10:48:20,791 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.compactor]: Added
> maprfs:/hbase/usertable/44386ab6079bd5b497a6de3ab95e850c/family/1800354539520698957,
> entries=10943, sequenceid=128924, memsize=3.4m, filesize=1.5m
> 2011-01-23 10:48:20,792 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [regionserver60020.compactor]: Closed
> usertable,,1295808232386.44386ab6079bd5b497a6de3ab95e850c.
> 2011-01-23 10:48:20,828 INFO org.apache.hadoop.hbase.catalog.MetaEditor
> [regionserver60020.compactor]: Offlined parent region
> usertable,,1295808232386.44386ab6079bd5b497a6de3ab95e850c. in META
> 2011-01-23 10:48:20,856 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [perfnode15.perf.lab,60020,1295807975391-daughterOpener=89e0f70da1e5ce2d5c4024ca6cc1addb]:
> Onlined usertable,,1295808500713.89e0f70da1e5ce2d5c4024ca6cc1addb.; next
> sequenceid=128925
> 2011-01-23 10:48:20,863 INFO org.apache.hadoop.hbase.catalog.MetaEditor
> [perfnode15.perf.lab,60020,1295807975391-daughterOpener=89e0f70da1e5ce2d5c4024ca6cc1addb]:
> Added daughter usertable,,1295808500713.89e0f70da1e5ce2d5c4024ca6cc1addb. in
> region .META.,,1, serverInfo=perfnode15.perf.lab,60020,1295807975391
> 2011-01-23 10:48:20,868 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [perfnode15.perf.lab,60020,1295807975391-daughterOpener=fd1d4e71c9a7e262a6e26adc0742414e]:
> Onlined
> usertable,user1907848630,1295808500713.fd1d4e71c9a7e262a6e26adc0742414e.;
> next sequenceid=128926
> 2011-01-23 10:48:20,869 INFO org.apache.hadoop.hbase.catalog.MetaEditor
> [perfnode15.perf.lab,60020,1295807975391-daughterOpener=fd1d4e71c9a7e262a6e26adc0742414e]:
> Added daughter
> usertable,user1907848630,1295808500713.fd1d4e71c9a7e262a6e26adc0742414e. in
> region .META.,,1, serverInfo=perfnode15.perf.lab,60020,1295807975391
> 2011-01-23 10:48:20,870 INFO
> org.apache.hadoop.hbase.regionserver.CompactSplitThread
> [regionserver60020.compactor]: Region split, META updated, and report to
> master. Parent=usertable,,1295808232386.44386ab6079bd5b497a6de3ab95e850c.,
> new regions: usertable,,1295808500713.89e0f70da1e5ce2d5c4024ca6cc1addb.,
> usertable,user1907848630,1295808500713.fd1d4e71c9a7e262a6e26adc0742414e..
> Split took 0sec
> 2011-01-23 10:48:20,871 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [regionserver60020.compactor]: Starting compaction on region
> usertable,,1295808500713.89e0f70da1e5ce2d5c4024ca6cc1addb.
> 2011-01-23 10:48:20,873 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.compactor]: Started compaction of 4 file(s) in cf=family,
> hasReferences=true, into
> maprfs:/hbase/usertable/89e0f70da1e5ce2d5c4024ca6cc1addb/.tmp, seqid=128924,
> totalSize=271.3m
> 2011-01-23 10:48:21,822 ERROR
> org.apache.hadoop.hbase.regionserver.HRegionServer [IPC Server handler 1 on
> 60020]:
> java.lang.RuntimeException: Cached an already cached block
> at
> org.apache.hadoop.hbase.io.hfile.LruBlockCache.cacheBlock(LruBlockCache.java:252)
> at
> org.apache.hadoop.hbase.io.hfile.HFile$Reader.readBlock(HFile.java:1056)
> at
> org.apache.hadoop.hbase.io.hfile.HFile$Reader$Scanner.seekTo(HFile.java:1433)
> at
> org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekTo(HalfStoreFileReader.java:160)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:139)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:96)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:77)
> at
> org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:1338)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner.<init>(HRegion.java:2229)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.instantiateInternalScanner(HRegion.java:1119)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1111)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1095)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:2951)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:2853)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:1623)
> at sun.reflect.GeneratedMethodAccessor3.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.HBaseRPC$Server.call(HBaseRPC.java:570)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1036)
> 2011-01-23 10:48:28,877 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.compactor]: Completed compaction of 4 file(s), new
> file=maprfs:/hbase/usertable/89e0f70da1e5ce2d5c4024ca6cc1addb/family/1639385306246002272,
> size=125.9m; total size for store is 125.9m
> 2011-01-23 10:48:28,877 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [regionserver60020.compactor]: completed compaction on region
> usertable,,1295808500713.89e0f70da1e5ce2d5c4024ca6cc1addb. after 8sec
> 2011-01-23 10:48:28,879 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [regionserver60020.compactor]: Starting compaction on region
> usertable,user1907848630,1295808500713.fd1d4e71c9a7e262a6e26adc0742414e.
> 2011-01-23 10:48:28,881 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.compactor]: Started compaction of 4 file(s) in cf=family,
> hasReferences=true, into
> maprfs:/hbase/usertable/fd1d4e71c9a7e262a6e26adc0742414e/.tmp, seqid=128925,
> totalSize=271.3m
> 2011-01-23 10:48:33,880 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.compactor]: Completed compaction of 4 file(s), new
> file=maprfs:/hbase/usertable/fd1d4e71c9a7e262a6e26adc0742414e/family/7964093352375224080,
> size=141.2m; total size for store is 141.2m
> 2011-01-23 10:48:33,880 INFO org.apache.hadoop.hbase.regionserver.HRegion
> [regionserver60020.compactor]: completed compaction on region
> usertable,user1907848630,1295808500713.fd1d4e71c9a7e262a6e26adc0742414e.
> after 5sec
> 2011-01-23 10:48:44,117 INFO org.apache.hadoop.hbase.regionserver.Store
> [regionserver60020.cacheFlusher]: Renaming flushed file at
> maprfs:/hbase/usertable/fd1d4e71c9a7e262a6e26adc0742414e/.tmp/8006640041641015018
> to maprfs:/hbase/usertable/fd1d4e
> 71c9a7e262a6e26adc0742414e/family/2931765299907917041
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