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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10301) Blocks removed by thousands due to falsely detected zombie storages
Date Sun, 17 Apr 2016 19:51:25 GMT
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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