[Improve][Zeta] Fix RequestFuture/WALWorkHandler correctness and collapse redundant HdfsWriter syncs - #12081

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Rangsh:improve/zeta-checkpoint-state-store-latency-12058

Commits on Sep 4, 2026

[Improve][Zeta] Reduce checkpoint state-store latency variance from redundant WAL sync (#12058)
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Merge branch 'dev' into improve/zeta-checkpoint-state-store-latency-12058
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[Improve][Zeta] Address review: keep WAL sync fix, drop docs/comment noise (#12058)

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[Improve][Zeta] Document why RequestFuture.success is volatile (#12058)

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[Test][Zeta] Assert HdfsWriter.flush uses exactly one hsync path (#12058)

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Commits on Sep 7, 2026

[Improve][Zeta] Address SEZ9 review on RequestFuture/WALWorkHandler batch waits (#12058)

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