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Konstantin Shvachko commented on HDFS-875: ------------------------------------------ Now that HDFS-900 is closed, should we close this one as well? If not than it would be good to have a precise description of what the problem is, how it reveals itself, is it reproducible, and have anybody seen it live. > NameNode incorretly handles corrupt replicas > -------------------------------------------- > > Key: HDFS-875 > URL: https://issues.apache.org/jira/browse/HDFS-875 > Project: Hadoop HDFS > Issue Type: Bug > Components: name-node > Affects Versions: 0.21.0, 0.22.0 > Reporter: Hairong Kuang > Priority: Blocker > Fix For: 0.22.0 > > > I reviewed how NameNode handles corrupt replicas as part of work on HDFS-145. > Comparing to releases prior to 0.21, NameNode now does a good job identifying > corrupt replicas, but it seems to me there are two flaws how it handles the > corrupt replicas: > 1. NameNode does not add corrupt replicas to the block locations as what > NameNode does before; > 2. If the corruption is caused by generation stamp mismatch or state > mismatch, the wrong GS and state do not get put in corruptReplicasMap. > Therefore it may lead to the deletion of the wrong replica. -- This message is automatically generated by JIRA. - For more information on JIRA, see: http://www.atlassian.com/software/jira