openinx edited a comment on issue #242: HBASE-22422 Retain an ByteBuff with refCnt=0 when getBlock from LRUCache URL: https://github.com/apache/hbase/pull/242#issuecomment-493855072 bq. So even after this patch if QPS drops - you stlil get the exception as attached in the original JIRA description? Yeah, still has the stacktrace. Let me check. ``` Mon May 20 12:16:36 CST 2019, RpcRetryingCaller{globalStartTime=1558325539029, pause=200, maxAttempts=16}, java.io.IOException: java.io.IOException: org.apache.hbase.thirdparty.io.netty.util.IllegalReferenceCountException: refCnt: 0, increment: 1 at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.handleException(HRegion.java:6534) at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.initializeScanners(HRegion.java:6504) at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:6473) at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:2999) at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2979) at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2961) at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2955) at org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2621) at org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2548) at org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:41998) at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:374) at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:132) at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324) at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304) Caused by: org.apache.hbase.thirdparty.io.netty.util.IllegalReferenceCountException: refCnt: 0, increment: 1 at org.apache.hbase.thirdparty.io.netty.util.AbstractReferenceCounted.retain0(AbstractReferenceCounted.java:87) at org.apache.hbase.thirdparty.io.netty.util.AbstractReferenceCounted.retain(AbstractReferenceCounted.java:74) at org.apache.hadoop.hbase.nio.SingleByteBuff.retain(SingleByteBuff.java:398) at org.apache.hadoop.hbase.nio.SingleByteBuff.retain(SingleByteBuff.java:39) at org.apache.hadoop.hbase.io.hfile.HFileBlock.retain(HFileBlock.java:449) at org.apache.hadoop.hbase.io.hfile.HFileBlock.retain(HFileBlock.java:115) at org.apache.hadoop.hbase.io.hfile.LruBlockCache.getBlock(LruBlockCache.java:538) at org.apache.hadoop.hbase.io.hfile.CombinedBlockCache.getBlock(CombinedBlockCache.java:84) at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.getCachedBlock(HFileReaderImpl.java:1298) at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.readBlock(HFileReaderImpl.java:1464) at org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$CellBasedKeyBlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:339) at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.seekTo(HFileReaderImpl.java:844) at org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.seekTo(HFileReaderImpl.java:794) at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:315) at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:216) at org.apache.hadoop.hbase.regionserver.StoreScanner.seekScanners(StoreScanner.java:394) at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:249) at org.apache.hadoop.hbase.regionserver.HStore.createScanner(HStore.java:2063) at org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2054) at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.initializeScanners(HRegion.java:6493) ... 12 more ```
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