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From "Han Xiao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4608) A File could not be recovery, when a block is added to it in nn, but not created in dn.
Date Mon, 18 Mar 2013 07:40:14 GMT
Han Xiao created HDFS-4608:
------------------------------

             Summary: A File could not be recovery, when a block is added to it in nn, but
not created in dn.
                 Key: HDFS-4608
                 URL: https://issues.apache.org/jira/browse/HDFS-4608
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
            Reporter: Han Xiao


In such steps. A file would not be recoveried forever.
1. create a file
2. write data and flush
3. terminate the client after the NameNode allocate block for it and before client write data
to DataNode
4. then shutdown the NN
5. start the NN

then, the file could not be recovered since the new-started NN has no DN to report the replica
of the block. so any open operation to the file would fail.
It is a very serious problem, since that if it happen to HBase's HLog file, its region server
would not be started, causing that region server would try to open the HLog file with no-endding.

the log of recovering in NN is:
2013-03-18 14:14:19,811 INFO  [IPC Server handler 7 on 8020] recoverLease: recover lease [Lease.
 Holder: DFSClient_NONMAPREDUCE_154241349_1, pendingcreates: 1], src=/testVT/1_5 from client
DFSClient_NONMAPREDUCE_154241349_1 org.apache.hadoop.hdfs.server.namenode.FSNamesystem.recoverLeaseInternal(FSNamesystem.java:1829)
2013-03-18 14:14:19,811 INFO  [IPC Server handler 7 on 8020] Recovering lease=[Lease.  Holder:
DFSClient_NONMAPREDUCE_154241349_1, pendingcreates: 1], src=/testVT/1_5 org.apache.hadoop.hdfs.server.namenode.FSNamesystem.internalReleaseLease(FSNamesystem.java:2826)
2013-03-18 14:14:19,812 WARN  [IPC Server handler 7 on 8020] BLOCK* BlockInfoUnderConstruction.initLeaseRecovery:
No blocks found, lease removed. org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction.initializeBlockRecovery(BlockInfoUnderConstruction.java:236)
2013-03-18 14:14:19,812 WARN  [IPC Server handler 7 on 8020] DIR* NameSystem.internalReleaseLease:
File /testVT/1_5 has not been closed. Lease recovery is in progress. RecoveryId = 3035 for
block blk_5356563093942391579_3034{blockUCState=UNDER_RECOVERY, primaryNodeIndex=-1, replicas=[]}
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.internalReleaseLease(FSNamesystem.java:2941)

the log of opening of the file is:
java.io.IOException: Could not obtain the last block locations.
	at org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:138)
	at org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:112)
	at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:989)
	at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:212)
	at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:75)
	at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:666)

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