[ https://issues.apache.org/jira/browse/HADOOP-2065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Robert Chansler updated HADOOP-2065:
------------------------------------
Release Note: Added "corrupt" flag to LocatedBlock to indicate that all replicas of the
block thought to be corrupt. (was: Changes LocatedBlock by adding a new 'corrupt' flag.
This patch changes the way replication is handled for corrupt blocks. We retain all corrupt
replicas of a block and provide a way flag to check if the block is good or corrupt.)
> Replication policy for corrupted block
> ---------------------------------------
>
> Key: HADOOP-2065
> URL: https://issues.apache.org/jira/browse/HADOOP-2065
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.14.1
> Reporter: Koji Noguchi
> Assignee: Lohit Vijayarenu
> Fix For: 0.18.0
>
> Attachments: HADOOP-2065-2.patch, HADOOP-2065-3.patch, HADOOP-2065-4.patch, HADOOP-2065-5.patch,
HADOOP-2065-6.patch, HADOOP-2065-7.patch, HADOOP-2065.patch
>
>
> Thanks to HADOOP-1955, even if one of the replica is corrupted, the block should get
replicated from a good replica relatively fast.
> Created this ticket to continue the discussion from http://issues.apache.org/jira/browse/HADOOP-1955#action_12531162.
> bq. 2. Delete corrupted source replica
> bq. 3. If all replicas are corrupt, stop replication.
> For (2), it'll be nice if the namenode can delete the corrupted block if there's a good
replica on other nodes.
> For (3), I prefer if the namenode can still replicate the block.
> Before 0.14, if the file was corrupted, users were still able to pull the data and decide
if they want to delete those files. (HADOOP-2063)
> In 0.14 and later, we cannot/don't replicate these blocks so they eventually get lost.
> To make the matters worse, if the corrupted file is accessed, all the corrupted replicas
would be deleted except for one and stay as replication factor of 1 forever.
>
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