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Posted to hdfs-dev@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2016/04/17 21:51:25 UTC

[jira] [Created] (HDFS-10301) Blocks removed by thousands due to falsely detected zombie storages

Konstantin Shvachko created HDFS-10301:
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             Summary: Blocks removed by thousands due to falsely detected zombie storages
                 Key: HDFS-10301
                 URL: https://issues.apache.org/jira/browse/HDFS-10301
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.6.1
            Reporter: Konstantin Shvachko
            Priority: Critical


When NameNode is busy a DataNode can timeout sending a block report. Then it sends the block report again. Then NameNode while process these two reports at the same time can interleave processing storages from different reports. This screws up the blockReportId field, which makes NameNode think that some storages are zombie. Replicas from zombie storages are immediately removed, causing missing blocks.



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