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https://issues.apache.org/jira/browse/HBASE-9818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13814118#comment-13814118
]
Sergey Shelukhin commented on HBASE-9818:
-----------------------------------------
But yeah maybe wrapper method needs to be encapsulated with getting stream
together. Maybe there's no real sync issue, and it just needs to not throw, and
then on next read it will rebuild the heap. Although it does seem pretty
suspect, it has a stream and someone closes it in parallel.
> 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-v2.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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