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https://issues.apache.org/jira/browse/HBASE-17501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15889905#comment-15889905
]
stack commented on HBASE-17501:
-------------------------------
Good man [~lumost] You get the bit that the new file is missing a license (see
how all src files in hbase have the apache license comment at their head).
Add one of these annoations on the file too boss... and we are good to go. Its
a good patch.
> NullPointerException after Datanodes Decommissioned and Terminated
> ------------------------------------------------------------------
>
> Key: HBASE-17501
> URL: https://issues.apache.org/jira/browse/HBASE-17501
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.2.0
> Environment: CentOS Derivative with a derivative of the 3.18.43
> kernel. HBase on CDH5.9.0 with some patches. HDFS CDH 5.9.0 with no patches.
> Reporter: Patrick Dignan
> Assignee: James Moore
> Priority: Minor
> Attachments: HBASE_17501.patch, HBASE_17501.patch,
> HBASE_17501.patch.v2
>
>
> We recently encountered an interesting NullPointerException in HDFS that
> bubbles up to HBase, and is resolved be restarting the regionserver. The
> issue was exhibited while we were replacing a set of nodes in one of our
> clusters with a new set. We did the following:
> 1. Turn off the HBase balancer
> 2. Gracefully move the regions off the nodes we’re shutting off using a tool
> we wrote to do so
> 3. Decommission the datanodes using the HDFS exclude hosts file and hdfs
> dfsadmin -refreshNodes
> 4. Wait for the datanodes to decommission fully
> 5. Terminate the VMs the instances are running inside.
> A few notes. We did not shutdown the datanode processes, and the nodes were
> therefore not marked as dead by the namenode. We simply terminated the
> datanode VM (in this case an AWS instance). The nodes were marked as
> decommissioned. We are running our clusters with DNS, and when we terminate
> VMs, the associated CName is removed and no longer resolves. The errors do
> not seem to resolve without a restart.
> After we did this, the remaining regionservers started throwing
> NullPointerExceptions with the following stack trace:
> 2017-01-19 23:09:05,638 DEBUG org.apache.hadoop.hbase.ipc.RpcServer:
> RpcServer.RW.fifo.Q.read.handler=80,queue=14,port=60020: callId: 1727723891
> service: ClientService methodName: Scan size: 216 connection:
> 172.16.36.128:31538
> java.io.IOException
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2214)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:123)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:204)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:183)
> Caused by: java.lang.NullPointerException
> at org.apache.hadoop.hdfs.DFSInputStream.seek(DFSInputStream.java:1564)
> at org.apache.hadoop.fs.FSDataInputStream.seek(FSDataInputStream.java:62)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.readAtOffset(HFileBlock.java:1434)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockDataInternal(HFileBlock.java:1682)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockData(HFileBlock.java:1542)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:445)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:266)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:642)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:592)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:294)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:199)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.seekScanners(StoreScanner.java:343)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:198)
> at
> org.apache.hadoop.hbase.regionserver.HStore.createScanner(HStore.java:2106)
> at
> org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2096)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:5544)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:2569)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2555)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2536)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2405)
> at
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33738)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2170)
> ... 3 more
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