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https://issues.apache.org/jira/browse/HADOOP-898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12465823
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Devaraj Das commented on HADOOP-898:
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Not sure whether the issues I see are related to this bug or not.
Along with sporadic failures of TestSmallBlock testcase, I also see TestPread
failing once in a while with the exception:
Impossible situation: could not find target position 8192
java.io.IOException: Impossible situation: could not find target position 8192
at
org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:873)
at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:61)
at
org.apache.hadoop.fs.FSDataInputStream$Checker.readFully(FSDataInputStream.java:155)
at
org.apache.hadoop.fs.FSDataInputStream$PositionCache.readFully(FSDataInputStream.java:212)
at
org.apache.hadoop.fs.FSDataInputStream$Buffer.readFully(FSDataInputStream.java:265)
at
org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:315)
at org.apache.hadoop.dfs.TestPread.pReadFile(TestPread.java:92)
at org.apache.hadoop.dfs.TestPread.testPreadDFS(TestPread.java:119)
Once I also saw the TestDFSShell failing (forgot to note the exception).
The DFS has become somewhat flaky lately.
> namenode generates infinite stream of null pointers
> ---------------------------------------------------
>
> Key: HADOOP-898
> URL: https://issues.apache.org/jira/browse/HADOOP-898
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: Owen O'Malley
> Assigned To: Raghu Angadi
> Attachments: HADOOP-898-2.patch, HADOOP-898.patch
>
>
> My namenode is generating a constant stream of NullPointerExceptions. The log
> looks like:
> 2007-01-17 19:51:27,461 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 3
> on 50000 call error: java.io.IOException: java.lang.NullPointerException
> java.io.IOException: java.lang.NullPointerException
> at
> org.apache.hadoop.dfs.FSNamesystem.addStoredBlock(FSNamesystem.java:1621)
> at
> org.apache.hadoop.dfs.FSNamesystem.processReport(FSNamesystem.java:1563)
> at org.apache.hadoop.dfs.NameNode.blockReport(NameNode.java:573)
> at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:589)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:337)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:538)
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