check cache value size

[javeme]

Change-Id: I56d83d37fab7bcf7f19e1fb17fcf566ad50d8ef4

[javeme]

java.lang.IllegalArgumentException: The max length of bytes is 65535, but got 90334
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:146) ~[guava-19.0.jar:?]
	at com.baidu.hugegraph.util.E.checkArgument(E.java:56) ~[hugegraph-common-1.7.5.jar:1.7.5.0]
	at com.baidu.hugegraph.backend.serializer.BytesBuffer.writeBytes(BytesBuffer.java:281) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache$Value.serializeElement(OffheapCache.java:293) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache$Value.serialize(OffheapCache.java:233) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache$Value.asBuffer(OffheapCache.java:215) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache$Value.serializedSize(OffheapCache.java:204) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache$ValueSerializer.serializedSize(OffheapCache.java:180) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache$ValueSerializer.serializedSize(OffheapCache.java:1) ~[classes/:?]
	at org.caffinitas.ohc.linked.OHCacheLinkedImpl.valueSize(OHCacheLinkedImpl.java:309) ~[ohc-core-0.7.0.jar:?]
	at org.caffinitas.ohc.linked.OHCacheLinkedImpl.putInternal(OHCacheLinkedImpl.java:249) ~[ohc-core-0.7.0.jar:?]
	at org.caffinitas.ohc.linked.OHCacheLinkedImpl.put(OHCacheLinkedImpl.java:220) ~[ohc-core-0.7.0.jar:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache.write(OffheapCache.java:120) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.OffheapCache.write(OffheapCache.java:1) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.LevelCache.write(LevelCache.java:92) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.LevelCache.write(LevelCache.java:1) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.AbstractCache.update(AbstractCache.java:125) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.CachedGraphTransaction.queryVerticesByIds(CachedGraphTransaction.java:194) ~[classes/:?]
	at com.baidu.hugegraph.backend.cache.CachedGraphTransaction.queryVerticesFromBackend(CachedGraphTransaction.java:162) ~[classes/:?]
	at com.baidu.hugegraph.backend.tx.GraphTransaction.queryVertices(GraphTransaction.java:626) ~[classes/:?]
	at com.baidu.hugegraph.backend.tx.GraphTransaction.queryAdjacentVertices(GraphTransaction.java:588) ~[classes/:?]

[codecov]

Codecov Report

Merging #933 into master will decrease coverage by 0.01%.
The diff coverage is 68.18%.

@@             Coverage Diff              @@
##             master     #933      +/-   ##
============================================
- Coverage     72.04%   72.02%   -0.02%     
  Complexity     4674     4674              
============================================
  Files           298      298              
  Lines         22293    22295       +2     
  Branches       3153     3154       +1     
============================================
- Hits          16060    16059       -1     
- Misses         4671     4675       +4     
+ Partials       1562     1561       -1     

Impacted Files	Coverage Δ	Complexity Δ
...om/baidu/hugegraph/backend/cache/OffheapCache.java	75.30% <50.00%> (-1.25%)	16.00 <3.00> (ø)
...m/baidu/hugegraph/backend/cache/AbstractCache.java	69.38% <83.33%> (-0.91%)	28.00 <0.00> (ø)
.../com/baidu/hugegraph/backend/cache/LevelCache.java	92.10% <100.00%> (+0.21%)	19.00 <2.00> (ø)
...va/com/baidu/hugegraph/backend/cache/RamCache.java	71.83% <100.00%> (ø)	27.00 <0.00> (ø)
...n/java/com/baidu/hugegraph/task/TaskScheduler.java	83.14% <0.00%> (-0.38%)	62.00% <0.00%> (ø%)
...a/com/baidu/hugegraph/backend/query/Condition.java	79.66% <0.00%> (+0.41%)	31.00% <0.00%> (ø%)

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