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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3332) NullPointerException in DN when directoryscanner is trying to report bad blocks
Date Tue, 01 May 2012 20:46:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266072#comment-13266072
] 

Tsz Wo (Nicholas), SZE commented on HDFS-3332:
----------------------------------------------

So, the problem is that the DN has not registered with standby NN but tries to report bad
blocks.  We probably should check if the registration is null before reporting the bad blocks.
                
> 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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