add locks while accessing redolog internal maps

[jshencode]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.18%. Comparing base (0eff36f) to head (8c58b16).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
- Coverage   71.21%   71.18%   -0.04%     
==========================================
  Files         178      178              
  Lines       23633    23635       +2     
==========================================
- Hits        16831    16825       -6     
- Misses       5465     5471       +6     
- Partials     1337     1339       +2     

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