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https://issues.apache.org/jira/browse/HADOOP-1309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12492792
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Michael Bieniosek commented on HADOOP-1309:
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I can't figure out what triggers this bug, but I've now seen it 3-4 times in
the past 2-3 weeks. I think it might have something to do with datanodes going
down badly.
> DFS logging in NameSystem.pendingTransfer consumes all disk space
> -----------------------------------------------------------------
>
> Key: HADOOP-1309
> URL: https://issues.apache.org/jira/browse/HADOOP-1309
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Michael Bieniosek
>
> Sometimes the namenode goes crazy. I see this in my logs:
> 2007-04-28 02:40:46,992 INFO org.apache.hadoop.dfs.StateChange: BLOCK*
> NameSystem.pendingTransfer: ask x.y.z.243:50010 to replicate
> blk_-9064654741761822118 to datanode(s) x.y.z.247:50010
> 2007-04-28 02:40:46,992 INFO org.apache.hadoop.dfs.StateChange: BLOCK*
> NameSystem.pendingTransfer: ask x.y.z.243:50010 to replicate
> blk_-8996500637974689840 to datanode(s) x.y.yz.225:50010
> 2007-04-28 02:40:46,992 INFO org.apache.hadoop.dfs.StateChange: BLOCK*
> NameSystem.pendingTransfer: ask x.y.z.227:50010 to replicate
> blk_-8870980160272831217 to datanode(s) x.y.z.244:50010
> 2007-04-28 02:40:46,992 INFO org.apache.hadoop.dfs.StateChange: BLOCK*
> NameSystem.pendingTransfer: ask x.y.z.227:50010 to replicate
> blk_-8721101562083234290 to datanode(s) x.y.z.250:50010
> 2007-04-28 02:40:46,992 INFO org.apache.hadoop.dfs.StateChange: BLOCK*
> NameSystem.pendingTransfer: ask x.y.z.250:50010 to replicate
> blk_-9044741671491162229 to datanode(s) x.y.z.244:50010
> There are on the order of 10k/sec until the machine runs out of disk space.
> I notice that in FSNamesystem.java, about 10 lines above this line is logged,
> there is a comment:
> //
> // Move the block-replication into a "pending" state.
> // The reason we use 'pending' is so we can retry
> // replications that fail after an appropriate amount of time.
> // (REMIND - mjc - this timer is not yet implemented.)
> //
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