[ https://issues.apache.org/jira/browse/HDFS-3332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265608#comment-13265608 ] 

amith commented on HDFS-3332:
-----------------------------

Yes Nicholas, I have configured 2 NN but started only 1 as active
                
> NullPointerException in DN when directoryscanner is trying to report bad blocks
> -------------------------------------------------------------------------------
>
>                 Key: HDFS-3332
>                 URL: https://issues.apache.org/jira/browse/HDFS-3332
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 3.0.0
>         Environment: HDFS
>            Reporter: amith
>            Assignee: amith
>             Fix For: 3.0.0
>
>
> There is 1 NN and 1 DN (NN is started with HA conf)
> I corrupted 1 block and found 
> {code}
> 2012-04-27 09:59:01,214 INFO  datanode.DataNode (BPServiceActor.java:blockReport(401)) - BlockReport of 2 blocks took 0 msec to generate and 5 msecs for RPC and NN processing
> 2012-04-27 09:59:01,214 INFO  datanode.DataNode (BPServiceActor.java:blockReport(420)) - sent block report, processed command:org.apache.hadoop.hdfs.server.protocol.FinalizeCommand@3b756db3
> 2012-04-27 09:59:01,726 INFO  datanode.DirectoryScanner (DirectoryScanner.java:scan(390)) - BlockPool BP-2087868617-10.18.40.95-1335500488012 Total blocks: 2, missing metadata files:0, missing block files:0, missing blocks in memory:0, mismatched blocks:1
> 2012-04-27 09:59:01,727 WARN  impl.FsDatasetImpl (FsDatasetImpl.java:checkAndUpdate(1366)) - Updating size of block -4466699320171028643 from 1024 to 1034
> 2012-04-27 09:59:01,727 WARN  impl.FsDatasetImpl (FsDatasetImpl.java:checkAndUpdate(1374)) - Reporting the block blk_-4466699320171028643_1004 as corrupt due to length mismatch
> 2012-04-27 09:59:01,728 DEBUG ipc.Client (Client.java:sendParam(807)) - IPC Client (1957050620) connection to /10.18.40.95:8020 from root sending #257
> 2012-04-27 09:59:01,730 DEBUG ipc.Client (Client.java:receiveResponse(848)) - IPC Client (1957050620) connection to /10.18.40.95:8020 from root got value #257
> 2012-04-27 09:59:01,730 DEBUG ipc.ProtobufRpcEngine (ProtobufRpcEngine.java:invoke(193)) - Call: reportBadBlocks 2
> 2012-04-27 09:59:01,731 ERROR datanode.DirectoryScanner (DirectoryScanner.java:run(288)) - Exception during DirectoryScanner execution - will continue next cycle
> java.lang.NullPointerException
> 	at org.apache.hadoop.hdfs.protocol.DatanodeID.<init>(DatanodeID.java:66)
> 	at org.apache.hadoop.hdfs.protocol.DatanodeInfo.<init>(DatanodeInfo.java:87)
> 	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.reportBadBlocks(BPServiceActor.java:238)
> 	at org.apache.hadoop.hdfs.server.datanode.BPOfferService.reportBadBlocks(BPOfferService.java:187)
> 	at org.apache.hadoop.hdfs.server.datanode.DataNode.reportBadBlocks(DataNode.java:559)
> 	at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.checkAndUpdate(FsDatasetImpl.java:1377)
> 	at org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.reconcile(DirectoryScanner.java:318)
> 	at org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.run(DirectoryScanner.java:284)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> 	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
> 	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
> 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
> 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181)
> 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:619)
> {code}
> Here when Directory scanner is trying to report badblock we got a NPE.

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