Konstantin Shvachko created HDFS-15915:
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Summary: Race condition with async edits logging due to updating
txId outside of the namesystem log
Key: HDFS-15915
URL: https://issues.apache.org/jira/browse/HDFS-15915
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs, namenode
Reporter: Konstantin Shvachko
{{FSEditLogAsync}} creates an {{FSEditLogOp}} and populates its fields inside
{{FSNamesystem.writeLock}}. But one essential field the transaction id of the
edits op remains unset until the time when the operation is scheduled for
synching. At that time {{beginTransaction()}} will set the the
{{FSEditLogOp.txid}} and increment the global transaction count. On busy
NameNode this event can fall outside the write lock.
This causes problems for Observer reads. It also can potentially reshuffle
transactions and Standby will apply them in a wrong order.
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