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https://issues.apache.org/jira/browse/HDFS-3664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414550#comment-13414550
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Eli Collins commented on HDFS-3664:
-----------------------------------
Here's the relevant portion of the log:
2012-07-14 20:28:44,991 INFO namenode.FSNamesystem
(FSNamesystem.java:stopActiveServices(673)) - Stopping services started for
active state
2012-07-14 20:28:44,991 WARN blockmanagement.DecommissionManager
(DecommissionManager.java:run(78)) - Monitor interrupted:
java.lang.InterruptedException: sleep interrupted
2012-07-14 20:28:44,991 INFO namenode.FSNamesystem
(FSNamesystem.java:stopStandbyServices(731)) - Stopping services started for
standby state
2012-07-14 20:28:44,992 WARN ipc.Server (Server.java:run(1706)) - IPC Server
handler 2 on 58865, call
org.apache.hadoop.hdfs.protocol.ClientProtocol.addBlock from 127.0.0.1:60713:
error: java.lang.NullPointerException
java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.blockmanagement.BlocksMap.getBlockCollection(BlocksMap.java:98)
at
org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.getBlockCollection(BlockManager.java:2893)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.isValidBlock(FSNamesystem.java:4437)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.allocateBlock(FSNamesystem.java:2409)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2170)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:470)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:292)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:42602)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:452)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:898)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1693)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1689)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1332)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1687)
> TestPersistBlocks#TestRestartDfsWithFlush failed with NPE
> ---------------------------------------------------------
>
> Key: HDFS-3664
> URL: https://issues.apache.org/jira/browse/HDFS-3664
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Reporter: Eli Collins
>
> Looks like there's a race hit by the test where we try to allocate a block
> after BlocksMap#close, resulting in an NPE.
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