Handle MultiRead return status

[anand1976]

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Expected behavior

In BlockBasedTable::RetrieveMultipleBlocks, the return status of the MultiRead call should be handled - https://github.com/facebook/rocksdb/blob/master/table/block_based/block_based_table_reader.cc#L1696. In case of error, the error status should be reflected in each of the read requests.

Actual behavior

The return status is ignored.

Steps to reproduce the behavior

Read the code.

[jagij]

Master has been updated in the mean time. This link should work:

rocksdb/table/block_based/block_based_table_reader.cc

Line 1748 in 00751e4

file->MultiRead(opts, &read_reqs[0], read_reqs.size(), &direct_io_buf)