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https://issues.apache.org/jira/browse/HBASE-9818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13816126#comment-13816126
]
Ted Yu commented on HBASE-9818:
-------------------------------
Unfortunately the change in the trial patch seemed to affect timing.
After 200 iterations, there was still no failure:
{code}
$ grep 'rver.TestHRegion' 9818.out | wc
200 400 11400
{code}
> NPE in HFileBlock#AbstractFSReader#readAtOffset
> -----------------------------------------------
>
> Key: HBASE-9818
> URL: https://issues.apache.org/jira/browse/HBASE-9818
> Project: HBase
> Issue Type: Bug
> Reporter: Jimmy Xiang
> Assignee: Ted Yu
> Attachments: 9818-trial.txt, 9818-v2.txt, 9818-v3.txt, 9818-v4.txt,
> 9818-v5.txt
>
>
> HFileBlock#istream seems to be null. I was wondering should we hide
> FSDataInputStreamWrapper#useHBaseChecksum.
> By the way, this happened when online schema change is enabled (encoding)
> {noformat}
> 2013-10-22 10:58:43,321 ERROR [RpcServer.handler=28,port=36020]
> regionserver.HRegionServer:
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.readAtOffset(HFileBlock.java:1200)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockDataInternal(HFileBlock.java:1436)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockData(HFileBlock.java:1318)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:359)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:254)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:503)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.reseekTo(HFileReaderV2.java:553)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseekAtOrAfter(StoreFileScanner.java:245)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:166)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.enforceSeek(StoreFileScanner.java:361)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.pollRealKV(KeyValueHeap.java:336)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:293)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:258)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:603)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:476)
> at
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:129)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:3546)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:3616)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:3494)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:3485)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3079)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:27022)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:1979)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:90)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcScheduler.java:160)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$000(SimpleRpcScheduler.java:38)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler.java:110)
> at java.lang.Thread.run(Thread.java:724)
> 2013-10-22 10:58:43,665 ERROR [RpcServer.handler=23,port=36020]
> regionserver.HRegionServer:
> org.apache.hadoop.hbase.exceptions.OutOfOrderScannerNextException: Expected
> nextCallSeq: 53438 But the nextCallSeq got from client: 53437;
> request=scanner_id: 1252577470624375060 number_of_rows: 100 close_scanner:
> false next_call_seq: 53437
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3030)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:27022)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:1979)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:90)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcScheduler.java:160)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$000(SimpleRpcScheduler.java:38)
> at
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler.java:110)
> at java.lang.Thread.run(Thread.java:724)
> {noformat}
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