[jira] [Created] (HBASE-29688) Use VarHandle instead of Unsafe where possible in 3.x

["Charles Connell (Jira)" <ji...@apache.org>]

Charles Connell created HBASE-29688:
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             Summary: Use VarHandle instead of Unsafe where possible in 3.x
                 Key: HBASE-29688
                 URL: https://issues.apache.org/jira/browse/HBASE-29688
             Project: HBase
          Issue Type: Improvement
            Reporter: Charles Connell
            Assignee: Charles Connell


Java offers {{VarHandle}} to facilitate fast access to memory, in place of the {{Unsafe#get*}} and {{Unsafe#put*}} methods. It can be used as almost a drop-in replacement, and the performance is similar. {{VarHandle}} was introduced in Java 9. HBase 2.x supports Java 8, so we cannot use {{VarHandle}} in 2.x releases, but we can prepare to use it in 3.x releases. This will eliminate most uses of {{Unsafe}} in HBase. Remaining uses of {{Unsafe}} are for copying memory regions. There is an alternative available for that, {{MemorySegment}}, that is available in Java 22 and higher, but we'll tackle that much later.



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