Null pointer exception comes when Namenode recovery happens and there is no
response from client to NN more than the hardlimit for NN recovery and the
current block is more than the prev block size in NN
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Key: HDFS-1970
URL: https://issues.apache.org/jira/browse/HDFS-1970
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.20-append
Reporter: ramkrishna.s.vasudevan
Fix For: 0.20-append
Null pointer exception comes when Namenode recovery happens and there is no
response from client to NN more than the hardlimit for NN recovery and the
current block is more than the prev block size in NN
1. Write using a client to 2 datanodes
2. Kill one data node and allow pipeline recovery.
3. write somemore data to the same block
4. Parallely allow the namenode recovery to happen
Null pointer exception will come in addStoreBlock api.
Pls find the logs
Debugging in MachineName..
Listening for transport dt_socket at address: 8007
11/05/20 21:38:33 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = linux76/10.18.52.76
STARTUP_MSG: args = []
STARTUP_MSG: version = 0.20.3-SNAPSHOT
STARTUP_MSG: build = -r ; compiled by 'G00900856' on Tue Feb 1 11:40:14 IST
2011
************************************************************/
11/05/20 21:38:33 INFO metrics.RpcMetrics: Initializing RPC Metrics with
hostName=NameNode, port=9000
11/05/20 21:38:33 INFO namenode.NameNode: Namenode up at:
linux76/10.18.52.76:9000
11/05/20 21:38:33 INFO jvm.JvmMetrics: Initializing JVM Metrics with
processName=NameNode, sessionId=null
11/05/20 21:38:33 INFO metrics.NameNodeMetrics: Initializing NameNodeMeterics
using context object:org.apache.hadoop.metrics.spi.NullContext
11/05/20 21:38:33 INFO namenode.FSNamesystem: fsOwner=root,root
11/05/20 21:38:33 INFO namenode.FSNamesystem: supergroup=supergroup
11/05/20 21:38:33 INFO namenode.FSNamesystem: isPermissionEnabled=false
11/05/20 21:38:33 INFO metrics.FSNamesystemMetrics: Initializing
FSNamesystemMetrics using context
object:org.apache.hadoop.metrics.spi.NullContext
11/05/20 21:38:33 INFO namenode.FSNamesystem: Registered FSNamesystemStatusMBean
11/05/20 21:38:33 INFO common.Storage: Number of files = 1
11/05/20 21:38:33 INFO common.Storage: Number of files under construction = 0
11/05/20 21:38:33 INFO common.Storage: Image file of size 94 loaded in 0
seconds.
11/05/20 21:38:33 INFO common.Storage: Edits file
/home/ramkrishna/opensrchadoop/appendbranch/hadoop-0.20.3-SNAPSHOT/bin/../hadoop-root/dfs/name/current/edits
of size 4 edits # 0 loaded in 0 seconds.
11/05/20 21:38:33 INFO common.Storage: Image file of size 94 saved in 0 seconds.
11/05/20 21:38:34 INFO common.Storage: Image file of size 94 saved in 0 seconds.
11/05/20 21:38:34 INFO namenode.FSNamesystem: Finished loading FSImage in 482
msecs
11/05/20 21:38:34 INFO namenode.FSNamesystem: Total number of blocks = 0
11/05/20 21:38:34 INFO namenode.FSNamesystem: Number of invalid blocks = 0
11/05/20 21:38:34 INFO namenode.FSNamesystem: Number of under-replicated blocks
= 0
11/05/20 21:38:34 INFO namenode.FSNamesystem: Number of over-replicated blocks
= 0
11/05/20 21:38:34 INFO hdfs.StateChange: STATE* Leaving safe mode after 0 secs.
11/05/20 21:38:34 INFO hdfs.StateChange: STATE* Network topology has 0 racks
and 0 datanodes
11/05/20 21:38:34 INFO hdfs.StateChange: STATE* UnderReplicatedBlocks has 0
blocks
11/05/20 21:38:34 INFO mortbay.log: Logging to
org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
11/05/20 21:38:35 INFO http.HttpServer: Port returned by
webServer.getConnectors()[0].getLocalPort() before open() is -1. Opening the
listener on 50070
11/05/20 21:38:35 INFO http.HttpServer: listener.getLocalPort() returned 50070
webServer.getConnectors()[0].getLocalPort() returned 50070
11/05/20 21:38:35 INFO http.HttpServer: Jetty bound to port 50070
11/05/20 21:38:35 INFO mortbay.log: jetty-6.1.14
11/05/20 21:38:37 INFO mortbay.log: Started SelectChannelConnector@linux76:50070
11/05/20 21:38:37 INFO namenode.NameNode: Web-server up at: linux76:50070
11/05/20 21:38:37 INFO ipc.Server: IPC Server Responder: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server listener on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 0 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 1 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 2 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 3 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 4 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 5 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 6 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 7 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 8 on 9000: starting
11/05/20 21:38:37 INFO ipc.Server: IPC Server handler 9 on 9000: starting
11/05/20 21:38:38 INFO hdfs.StateChange: BLOCK* NameSystem.registerDatanode:
node registration from 10.18.52.76:50010 storage
DS-1868335495-10.18.52.76-50010-1305907718956
11/05/20 21:38:38 INFO net.NetworkTopology: Adding a new node:
/default-rack/10.18.52.76:50010
11/05/20 21:38:41 INFO hdfs.StateChange: BLOCK* NameSystem.registerDatanode:
node registration from 10.18.52.5:50010 storage
DS-721814011-10.18.52.5-50010-1305928120116
11/05/20 21:38:41 INFO net.NetworkTopology: Adding a new node:
/default-rack/10.18.52.5:50010
11/05/20 21:38:54 INFO FSNamesystem.audit: ugi=R00902313,Tardis
ip=/10.18.47.133 cmd=create src=/synctest0 dst=null
perm=R00902313:supergroup:rw-r--r--
11/05/20 21:38:54 INFO hdfs.StateChange: BLOCK* NameSystem.allocateBlock:
/synctest0. blk_-8455334393673385140_1001
11/05/20 21:38:55 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock:
blockMap updated: 10.18.52.5:50010 is added to blk_-8455334393673385140_1001
size 1024
11/05/20 21:38:55 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock:
blockMap updated: 10.18.52.76:50010 is added to blk_-8455334393673385140_1001
size 1024
11/05/20 21:38:55 INFO hdfs.StateChange: BLOCK* NameSystem.allocateBlock:
/synctest0. blk_8955752156241965528_1001
11/05/20 21:38:55 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock:
blockMap updated: 10.18.52.76:50010 is added to blk_8955752156241965528_1001
size 1024
11/05/20 21:38:55 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock:
blockMap updated: 10.18.52.5:50010 is added to blk_8955752156241965528_1001
size 1024
11/05/20 21:39:11 INFO hdfs.StateChange: BLOCK* NameSystem.allocateBlock:
/synctest0. blk_-5249191180607448701_1001
11/05/20 21:40:18 INFO namenode.FSNamesystem:
commitBlockSynchronization(lastblock=blk_-5249191180607448701_1001,
newgenerationstamp=1002, newlength=833, newtargets=[10.18.52.76:50010],
closeFile=false, deleteBlock=false)
11/05/20 21:40:18 INFO namenode.FSNamesystem: Number of transactions: 4 Total
time for transactions(ms): 2Number of transactions batched in Syncs: 0 Number
of syncs: 1 SyncTimes(ms): 28
11/05/20 21:40:18 INFO namenode.FSNamesystem:
commitBlockSynchronization(blk_-5249191180607448701_1002) successful
11/05/20 21:41:41 INFO namenode.LeaseManager: Lease [Lease. Holder:
DFSClient_-676883980, pendingcreates: 1] has expired hard limit
11/05/20 21:41:56 INFO namenode.FSNamesystem: Recovering lease=[Lease. Holder:
DFSClient_-676883980, pendingcreates: 1], src=/synctest0
11/05/20 21:41:56 INFO hdfs.StateChange: BLOCK* blk_-5249191180607448701_1002
recovery started, primary=10.18.52.76:50010
11/05/20 21:42:09 INFO namenode.FSNamesystem:
commitBlockSynchronization(lastblock=blk_-5249191180607448701_1002,
newgenerationstamp=1003, newlength=867, newtargets=[10.18.52.76:50010],
closeFile=true, deleteBlock=false)
11/05/20 21:42:26 INFO hdfs.StateChange: BLOCK* NameSystem.addStoredBlock:
addStoredBlock request received for blk_-5249191180607448701_1003 on
10.18.52.76:50010 size 867 and it belongs to a file under construction.
11/05/20 21:42:52 WARN namenode.FSNamesystem: Inconsistent size for block
blk_-5249191180607448701_1003 reported from 10.18.52.76:50010 current size is
833 reported size is 867
11/05/20 21:43:11 WARN namenode.FSNamesystem: Block
blk_-5249191180607448701_1003 reported from 10.18.52.76:50010 does not exist in
blockMap. Surprise! Surprise!
11/05/20 21:43:13 INFO hdfs.StateChange: Removing lease on file /synctest0
from client NN_Recovery
11/05/20 21:43:13 INFO hdfs.StateChange: BLOCK* ask 10.18.52.76:50010 to
replicate blk_-5249191180607448701_1003 to datanode(s) 10.18.52.5:50010
11/05/20 21:43:13 INFO namenode.FSNamesystem: Number of transactions: 6 Total
time for transactions(ms): 2Number of transactions batched in Syncs: 0 Number
of syncs: 2 SyncTimes(ms): 30
11/05/20 21:43:13 INFO namenode.FSNamesystem:
commitBlockSynchronization(newblock=blk_-5249191180607448701_1003,
file=/synctest0, newgenerationstamp=1003, newlength=867,
newtargets=[10.18.52.76:50010]) successful
11/05/20 21:43:15 INFO ipc.Server: IPC Server handler 6 on 9000, call
blockReceived(DatanodeRegistration(10.18.52.76:50010,
storageID=DS-1868335495-10.18.52.76-50010-1305907718956, infoPort=50075,
ipcPort=50020), [Lorg.apache.hadoop.hdfs.protocol.Block;@9b774e,
[Ljava.lang.String;@b5d05b) from 10.18.52.76:40343: error: java.io.IOException:
java.lang.NullPointerException
java.io.IOException: java.lang.NullPointerException
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.addStoredBlock(FSNamesystem.java:3173)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.blockReceived(FSNamesystem.java:3592)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.blockReceived(NameNode.java:756)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:961)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:957)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:955)
11/05/20 21:43:19 WARN hdfs.StateChange: BLOCK* NameSystem.addStoredBlock:
Redundant addStoredBlock request received for blk_-5249191180607448701_1003 on
10.18.52.76:50010 size 867
11/05/20 21:43:19 INFO hdfs.StateChange: BLOCK* ask 10.18.52.76:50010 to
replicate blk_-5249191180607448701_1003 to datanode(s) 10.18.52.5:50010
Listening for transport dt_socket at address: 8007
11/05/20 21:43:22 INFO hdfs.StateChange: BLOCK* ask 10.18.52.76:50010 to
replicate blk_-5249191180607448701_1003 to datanode(s) 10.18.52.5:50010
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