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https://issues.apache.org/jira/browse/HBASE-16604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15488646#comment-15488646
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Enis Soztutar commented on HBASE-16604:
---------------------------------------
bq. On the patch, just a thought - should we treat the ScannerResetException
the same way as the UnknownScannerException (in terms of checking timeout) in
ClientScanne
Master branch does not have this check any more for USE it seems.
> Scanner retries on IOException can cause the scans to miss data
> ----------------------------------------------------------------
>
> Key: HBASE-16604
> URL: https://issues.apache.org/jira/browse/HBASE-16604
> Project: HBase
> Issue Type: Bug
> Components: regionserver, Scanners
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 2.0.0, 1.3.0, 1.4.0, 1.1.7, 1.2.4
>
> Attachments: hbase-16604_v1.patch
>
>
> Debugging an ITBLL failure, where the Verify did not "see" all the data in
> the cluster, I've noticed that if we end up getting a generic IOException
> from the HFileReader level, we may end up missing the rest of the data in the
> region. I was able to manually test this, and this stack trace helps to
> understand what is going on:
> {code}
> 2016-09-09 16:27:15,633 INFO [hconnection-0x71ad3d8a-shared--pool21-t9]
> client.ScannerCallable(376): Open scanner=1 for
> scan={"loadColumnFamiliesOnDemand":null,"startRow":"","stopRow":"","batch":-1,"cacheBlocks":true,"totalColumns":1,"maxResultSize":2097152,"families":{"testFamily":["testFamily"]},"caching":100,"maxVersions":1,"timeRange":[0,9223372036854775807]}
> on region
> region=testScanThrowsException,,1473463632707.b2adfb618e5d0fe225c1dc40c0eabfee.,
> hostname=hw10676,51833,1473463626529, seqNum=2
> 2016-09-09 16:27:15,634 INFO
> [B.fifo.QRpcServer.handler=5,queue=0,port=51833]
> regionserver.RSRpcServices(2196): scan request:scanner_id: 1 number_of_rows:
> 100 close_scanner: false next_call_seq: 0 client_handles_partials: true
> client_handles_heartbeats: true renew: false
> 2016-09-09 16:27:15,635 INFO
> [B.fifo.QRpcServer.handler=5,queue=0,port=51833]
> regionserver.RSRpcServices(2510): Rolling back next call seqId
> 2016-09-09 16:27:15,635 INFO
> [B.fifo.QRpcServer.handler=5,queue=0,port=51833]
> regionserver.RSRpcServices(2565): Throwing new
> ServiceExceptionjava.io.IOException: Could not reseek
> StoreFileScanner[HFileScanner for reader
> reader=hdfs://localhost:51795/user/enis/test-data/d6fb1c70-93c1-4099-acb7-5723fc05a737/data/default/testScanThrowsException/b2adfb618e5d0fe225c1dc40c0eabfee/testFamily/5a213cc23b714e5e8e1a140ebbe72f2c,
> compression=none, cacheConf=blockCache=LruBlockCache{blockCount=0,
> currentSize=1567264, freeSize=1525578848, maxSize=1527146112,
> heapSize=1567264, minSize=1450788736, minFactor=0.95, multiSize=725394368,
> multiFactor=0.5, singleSize=362697184, singleFactor=0.25},
> cacheDataOnRead=true, cacheDataOnWrite=false, cacheIndexesOnWrite=false,
> cacheBloomsOnWrite=false, cacheEvictOnClose=false, cacheDataCompressed=false,
> prefetchOnOpen=false, firstKey=aaa/testFamily:testFamily/1473463633859/Put,
> lastKey=zzz/testFamily:testFamily/1473463634271/Put, avgKeyLen=35,
> avgValueLen=3, entries=17576, length=866998,
> cur=/testFamily:/OLDEST_TIMESTAMP/Minimum/vlen=0/seqid=0] to key
> /testFamily:testFamily/LATEST_TIMESTAMP/Maximum/vlen=0/seqid=0
> 2016-09-09 16:27:15,635 DEBUG
> [B.fifo.QRpcServer.handler=5,queue=0,port=51833] ipc.CallRunner(110):
> B.fifo.QRpcServer.handler=5,queue=0,port=51833: callId: 26 service:
> ClientService methodName: Scan size: 26 connection: 192.168.42.75:51903
> java.io.IOException: Could not reseek StoreFileScanner[HFileScanner for
> reader
> reader=hdfs://localhost:51795/user/enis/test-data/d6fb1c70-93c1-4099-acb7-5723fc05a737/data/default/testScanThrowsException/b2adfb618e5d0fe225c1dc40c0eabfee/testFamily/5a213cc23b714e5e8e1a140ebbe72f2c,
> compression=none, cacheConf=blockCache=LruBlockCache{blockCount=0,
> currentSize=1567264, freeSize=1525578848, maxSize=1527146112,
> heapSize=1567264, minSize=1450788736, minFactor=0.95, multiSize=725394368,
> multiFactor=0.5, singleSize=362697184, singleFactor=0.25},
> cacheDataOnRead=true, cacheDataOnWrite=false, cacheIndexesOnWrite=false,
> cacheBloomsOnWrite=false, cacheEvictOnClose=false, cacheDataCompressed=false,
> prefetchOnOpen=false, firstKey=aaa/testFamily:testFamily/1473463633859/Put,
> lastKey=zzz/testFamily:testFamily/1473463634271/Put, avgKeyLen=35,
> avgValueLen=3, entries=17576, length=866998,
> cur=/testFamily:/OLDEST_TIMESTAMP/Minimum/vlen=0/seqid=0] to key
> /testFamily:testFamily/LATEST_TIMESTAMP/Maximum/vlen=0/seqid=0
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:224)
> at
> org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.doRealSeek(NonLazyKeyValueScanner.java:55)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:312)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:268)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:815)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.seekAsDirection(StoreScanner.java:803)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:625)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:147)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5736)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5887)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5674)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2434)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32295)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2127)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$2.run(RpcExecutor.java:108)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: foo bar baz
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:207)
> ... 17 more
> 2016-09-09 16:27:15,653 INFO [hconnection-0x71ad3d8a-shared--pool21-t10]
> client.ScannerCallable(261): Got exception making request scanner_id: 1
> number_of_rows: 100 close_scanner: false next_call_seq: 0
> client_handles_partials: true client_handles_heartbeats: true renew: false to
> region=testScanThrowsException,,1473463632707.b2adfb618e5d0fe225c1dc40c0eabfee.,
> hostname=hw10676,51833,1473463626529, seqNum=2
> java.io.IOException: java.io.IOException: Could not reseek
> StoreFileScanner[HFileScanner for reader
> reader=hdfs://localhost:51795/user/enis/test-data/d6fb1c70-93c1-4099-acb7-5723fc05a737/data/default/testScanThrowsException/b2adfb618e5d0fe225c1dc40c0eabfee/testFamily/5a213cc23b714e5e8e1a140ebbe72f2c,
> compression=none, cacheConf=blockCache=LruBlockCache{blockCount=0,
> currentSize=1567264, freeSize=1525578848, maxSize=1527146112,
> heapSize=1567264, minSize=1450788736, minFactor=0.95, multiSize=725394368,
> multiFactor=0.5, singleSize=362697184, singleFactor=0.25},
> cacheDataOnRead=true, cacheDataOnWrite=false, cacheIndexesOnWrite=false,
> cacheBloomsOnWrite=false, cacheEvictOnClose=false, cacheDataCompressed=false,
> prefetchOnOpen=false, firstKey=aaa/testFamily:testFamily/1473463633859/Put,
> lastKey=zzz/testFamily:testFamily/1473463634271/Put, avgKeyLen=35,
> avgValueLen=3, entries=17576, length=866998,
> cur=/testFamily:/OLDEST_TIMESTAMP/Minimum/vlen=0/seqid=0] to key
> /testFamily:testFamily/LATEST_TIMESTAMP/Maximum/vlen=0/seqid=0
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:224)
> at
> org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.doRealSeek(NonLazyKeyValueScanner.java:55)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:312)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:268)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:815)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.seekAsDirection(StoreScanner.java:803)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:625)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:147)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5736)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5887)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5674)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2434)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32295)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2127)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$2.run(RpcExecutor.java:108)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: foo bar baz
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:207)
> ... 17 more
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
> at
> org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:106)
> at
> org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:95)
> at
> org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRemoteException(ProtobufUtil.java:332)
> at
> org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:256)
> at
> org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:1)
> at
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
> at
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:364)
> at
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:1)
> at
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:126)
> at
> org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:65)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by:
> org.apache.hadoop.hbase.ipc.RemoteWithExtrasException(java.io.IOException):
> java.io.IOException: Could not reseek StoreFileScanner[HFileScanner for
> reader
> reader=hdfs://localhost:51795/user/enis/test-data/d6fb1c70-93c1-4099-acb7-5723fc05a737/data/default/testScanThrowsException/b2adfb618e5d0fe225c1dc40c0eabfee/testFamily/5a213cc23b714e5e8e1a140ebbe72f2c,
> compression=none, cacheConf=blockCache=LruBlockCache{blockCount=0,
> currentSize=1567264, freeSize=1525578848, maxSize=1527146112,
> heapSize=1567264, minSize=1450788736, minFactor=0.95, multiSize=725394368,
> multiFactor=0.5, singleSize=362697184, singleFactor=0.25},
> cacheDataOnRead=true, cacheDataOnWrite=false, cacheIndexesOnWrite=false,
> cacheBloomsOnWrite=false, cacheEvictOnClose=false, cacheDataCompressed=false,
> prefetchOnOpen=false, firstKey=aaa/testFamily:testFamily/1473463633859/Put,
> lastKey=zzz/testFamily:testFamily/1473463634271/Put, avgKeyLen=35,
> avgValueLen=3, entries=17576, length=866998,
> cur=/testFamily:/OLDEST_TIMESTAMP/Minimum/vlen=0/seqid=0] to key
> /testFamily:testFamily/LATEST_TIMESTAMP/Maximum/vlen=0/seqid=0
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:224)
> at
> org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner.doRealSeek(NonLazyKeyValueScanner.java:55)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:312)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:268)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:815)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.seekAsDirection(StoreScanner.java:803)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:625)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:147)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5736)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5887)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5674)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2434)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32295)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2127)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
> at org.apache.hadoop.hbase.ipc.RpcExecutor$2.run(RpcExecutor.java:108)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: foo bar baz
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:207)
> ... 17 more
> at
> org.apache.hadoop.hbase.ipc.RpcClientImpl.call(RpcClientImpl.java:1225)
> at
> org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpcClient.java:213)
> at
> org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementation.callBlockingMethod(AbstractRpcClient.java:287)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$BlockingStub.scan(ClientProtos.java:32741)
> at
> org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:214)
> ... 9 more
> 2016-09-09 16:27:15,963 INFO
> [B.priority.fifo.QRpcServer.handler=8,queue=0,port=51824]
> regionserver.RSRpcServices(2196): scan request:region { type: REGION_NAME
> value: "hbase:meta,,1" } scan { start_row:
> "testScanThrowsException,,99999999999999" max_versions: 1 cache_blocks: true
> small: true reversed: true caching: 1 } number_of_rows: 1 close_scanner: true
> client_handles_partials: true client_handles_heartbeats: true
> 2016-09-09 16:27:15,965 INFO
> [B.priority.fifo.QRpcServer.handler=8,queue=0,port=51824]
> regionserver.RSRpcServices(2549): class
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ScanResponse:cells_per_result:
> 4 scanner_id: 15 more_results: false stale: false partial_flag_per_result:
> false more_results_in_region: true heartbeat_message: false
> 2016-09-09 16:27:15,967 INFO
> [B.fifo.QRpcServer.handler=0,queue=0,port=51833]
> regionserver.RSRpcServices(2196): scan request:scanner_id: 1 number_of_rows:
> 100 close_scanner: false next_call_seq: 0 client_handles_partials: true
> client_handles_heartbeats: true renew: false
> 2016-09-09 16:27:15,967 INFO
> [B.fifo.QRpcServer.handler=0,queue=0,port=51833]
> regionserver.RSRpcServices(2549): class
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ScanResponse:scanner_id:
> 1 more_results: true ttl: 60000 stale: false more_results_in_region: false
> 2016-09-09 16:27:15,968 INFO
> [B.fifo.QRpcServer.handler=1,queue=0,port=51833]
> regionserver.RSRpcServices(2196): scan request:scanner_id: 1 number_of_rows:
> 0 close_scanner: true client_handles_partials: true
> client_handles_heartbeats: true
> 2016-09-09 16:27:15,968 INFO
> [B.fifo.QRpcServer.handler=1,queue=0,port=51833]
> regionserver.RSRpcServices(2549): class
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ScanResponse:scanner_id:
> 1 more_results: false
> 2016-09-09 16:27:15,971 INFO [main] hbase.HBaseTestingUtility(1111):
> Shutting down minicluster
> {code}
> The ScannerCallable is retryable if it gets a IOException. Before the
> HBASE-13662 fix, the retry was still failing due to
> OutOfOrderScannerException, which then causes the Scanner stack to be reset,
> thus masking the issue. After HBASE-13662, we can retry the same scan, but in
> case of we are doing a {{reseek()}} which fails in middle with an
> IOException, the KVHeaps and the Scanner state on the server side is left
> dirty.
> It seems to be much safer to reset the scanner state in case of IOExceptions.
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