makes write behind queue's default behavior write-coalescing
iterator concurrent modification fix
code clean-ups
fix size calculation
remove max write behind queue capacity for write-coalescing mode which is default.
findbugs fix
Merge branch 'master' of https://github.com/hazelcast/hazelcast
Merge branch 'master' of https://github.com/hazelcast/hazelcast
add direct flush to db & rename some fields
test fixes
test fixes & small refactoring
test fixes
add gotcha
Merge branch 'master' of https://github.com/hazelcast/hazelcast
Merge branch 'master' of https://github.com/hazelcast/hazelcast
adds getFirst method to write-behind queue & small clean-up
Merge pull request #3002 from ahmetmircik/fix/3.3/writeCoalescing

Makes default write-behind mode as write-coalescing