FAQ
I'm using Hadoop 0.19.2.

It seems HDFS has lost a block, but I'm not able to figure out which file is
associated with it.

-- This is the error
2010-09-19 00:31:30,227 INFO
org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
commitBlockSynchronization(lastblock=blk_2691602201169754299_6824341,
newgenerationstamp=0, newlength=0, newtargets=[], closeFile=false,
deleteBlock=true)
2010-09-19 00:31:30,227 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 7 on 54310, call
commitBlockSynchronization(blk_2691602201169754299_6824341, 0, 0, false,
true, [Lorg.apache.hadoop.hdfs.protocol.DatanodeID;@1c898b41) from
192.168.33.144:34955: error: java.io.IOException: Block
(=blk_2691602201169754299_6824341) not found
java.io.IOException: Block (=blk_2691602201169754299_6824341) not found
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.commitBlockSynchronization(FSNamesystem.java:1913)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.commitBlockSynchronization(NameNode.java:410)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:481)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:894)

-- This returns nothing
bin/hadoop fsck / -files -blocks -locations | grep
blk_2691602201169754299_6824341

How is it that fsck doesn't know about the missing block?

How should this be addressed?

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