[
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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
