[
https://issues.apache.org/jira/browse/HADOOP-4810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656155#action_12656155
]
Hairong Kuang commented on HADOOP-4810:
---------------------------------------
I tried Konstantin's suggestion and found a problem with it. NN preserves a
block's size persistently. So when the first truncated block report, NN is able
to detect it and tries to invalidate it. But the invalidation fails because
this is the only copy for this block. So this corrupted replica slips in and
becomes a valid one.
I will keep the first patch.
> Data lost at cluster startup time
> ---------------------------------
>
> Key: HADOOP-4810
> URL: https://issues.apache.org/jira/browse/HADOOP-4810
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.18.2
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Priority: Blocker
> Fix For: 0.18.3
>
> Attachments: corruptBlocksStartup.patch
>
>
> hadoop dfs -cat file1 returns
> dfs.DFSClient: Could not obtain block blk_XX_0 from any node:
> java.io.IOException: No live nodes contain current block
> Tracing the history of the block from NN log, we found
> WARN org.apache.hadoop.fs.FSNamesystem: Inconsistent size for block
> blk_-6160940519231606858_0 reported from A1.A2.A3.A4:50010 current size is
> 9303872 reported size is 262144
> WARN org.apache.hadoop.fs.FSNamesystem: Deleting block
> blk_-6160940519231606858_0 from A1.A2.A3.A4:50010
> INFO org.apache.hadoop.dfs.StateChange: DIR* NameSystem.invalidateBlock:
> blk_-6160940519231606858_0 on A1.A2.A3.A4:50010
> WARN org.apache.hadoop.fs.FSNamesystem: Error in deleting bad block
> blk_-6160940519231606858_0 org.apache.hadoop.dfs.SafeModeException: Cannot
> invalidate block blk_-6160940519231606858_0. Name node is in safe mode.
> WARN org.apache.hadoop.fs.FSNamesystem: Inconsistent size for block
> blk_-6160940519231606858_0 reported from B1.B2.B3.B4:50010 current size is
> 9303872 reported size is 306688
> WARN org.apache.hadoop.fs.FSNamesystem: Deleting block
> blk_-6160940519231606858_0 from B1.B2.B3.B4:50010
> INFO org.apache.hadoop.dfs.StateChange: DIR* NameSystem.invalidateBlock:
> blk_-6160940519231606858_0 on B1.B2.B3.B4:50010
> WARN org.apache.hadoop.fs.FSNamesystem: Error in deleting bad block
> blk_-6160940519231606858_0 org.apache.hadoop.dfs.SafeModeException: Cannot
> invalidate block blk_-6160940519231606858_0. Name node is in safe mode.
> INFO org.apache.hadoop.dfs.StateChange: BLOCK*
> NameSystem.chooseExcessReplicates: (C1.C2.C3.C4:50010,
> blk_-6160940519231606858_0) is added to recentInvalidateSets
> INFO org.apache.hadoop.dfs.StateChange: BLOCK*
> NameSystem.chooseExcessReplicates: (D1.D2.D3.D4:50010,
> blk_-6160940519231606858_0) is added to recentInvalidateSets
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* ask C1.C2.C3.C4:50010 to
> delete blk_-6160940519231606858_0
> INFO org.apache.hadoop.dfs.StateChange: BLOCK* ask D1.D2.D3.D4:50010 to
> delete blk_-6160940519231606858_0
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
