Fix memory leak issue of reading small entries

[codelipenghui]

Descriptions of the changes in this PR:

Motivation

(Explain: why you're making that change, what is the problem you're trying to solve)

Changes

(Describe: what changes you have made)

Master Issue: #

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[codecov[bot]]

Codecov Report

Merging #448 (745b688) into master (73c5a0e) will increase coverage by 18.54%. The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             master     #448       +/-   ##
=============================================
+ Coverage     49.72%   68.27%   +18.54%     
- Complexity     4816     6754     +1938     
=============================================
  Files           473      473               
  Lines         40910    40918        +8     
  Branches       5232     5234        +2     
=============================================
+ Hits          20342    27936     +7594     
+ Misses        18551    10726     -7825     
- Partials       2017     2256      +239     

Flag	Coverage Δ
bookie	39.74% <12.50%> (-0.04%)	:arrow_down:
client	44.07% <50.00%> (?)
remaining	29.57% <87.50%> (+0.02%)	:arrow_up:
replication	41.28% <12.50%> (?)
tls	20.96% <12.50%> (-0.03%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...g/apache/bookkeeper/proto/BookieProtoEncoding.java	80.40% <100.00%> (+3.29%)	:arrow_up:
...ache/bookkeeper/replication/ReplicationWorker.java	75.59% <100.00%> (+0.18%)	:arrow_up:
...va/org/apache/bookkeeper/bookie/SkipListArena.java	76.19% <0.00%> (-4.77%)	:arrow_down:
...keeper/replication/AuditorCheckAllLedgersTask.java	53.74% <0.00%> (-2.73%)	:arrow_down:
...pache/bookkeeper/replication/AutoRecoveryMain.java	41.66% <0.00%> (-1.29%)	:arrow_down:
...eeper/bookie/EntryLogManagerForSingleEntryLog.java	83.67% <0.00%> (-1.03%)	:arrow_down:
...va/org/apache/bookkeeper/versioning/Versioned.java	75.00% <0.00%> (ø)
...g/apache/bookkeeper/bookie/DefaultEntryLogger.java	79.93% <0.00%> (ø)
...okkeeper/meta/ZkLedgerUnderreplicationManager.java	60.85% <0.00%> (+0.51%)	:arrow_up:
... and 237 more

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[codelipenghui]

Move to closed since the PR has been merged to apache/bookkeeper