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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