Continue writing after one chunkserver dead#843

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yvxiang wants to merge 15 commits intobaidu:masterfrom

yvxiang:write_support_prepare_write

Commits on Feb 7, 2017

Add proto
yangce
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Fix code style
yangce
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Disable close incomplete blocks
yangce
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Add GetChunkServer implementation
yangce
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Small fix
yangce
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Add PrepareForWrite implementation
yangce
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Add ut for SeekReceiveWindow
yangce
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Set block size in PrepareForWrite
yangce
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Fix Block::PrepareForWrite
yangce
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Remove Block::SetSize
yangce
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Add AddRecoverBlock
yangce
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Fix AddRecoverBlock
yangce
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Add PickRecoverWritingBlock
yangce
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Return cs_addr in PickRecoverWritingBlocks
yangce
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Revert "Disable close incomplete blocks"
yangce
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