Chen Liang created HDFS-14822:
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Summary: Revisit GlobalStateIdContext locking when getting server
state id
Key: HDFS-14822
URL: https://issues.apache.org/jira/browse/HDFS-14822
Project: Hadoop HDFS
Issue Type: Sub-task
Components: hdfs
Reporter: Chen Liang
Assignee: Chen Liang
As mentioned under HDFS-14277. One potential performance issue of Observer read
is that {{GlobalStateIdContext#getLastSeenStateId}} calls
getCorrectLastAppliedOrWrittenTxId which ends up acquiring lock on txnid. We
internally had some discussion and analysis, we believe this lock can be
avoided, by calling the non-locking version method
{{getLastAppliedOrWrittenTxId.}}
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