Revision 58b12dfe37784ce1bd67a03643147ab94f590451 authored by Reid Horuff on 06 March 2017, 23:04:36 UTC, committed by Facebook Github Bot on 06 March 2017, 23:09:11 UTC
Summary: Relating to #1903: In MaybeFlushColumnFamilies() we want to modify the 'getting_flushed' flag before releasing the db mutex when SwitchMemtable() is called. The following 2 actions need to be atomic in MaybeFlushColumnFamilies() - getting_flushed is false on oldest log - we determine that all CFs can be flushed to successfully release oldest log - we set getting_flushed = true on the oldest log. ------- - getting_flushed is false on oldest log - we determine that all CFs can NOT be flushed to successfully release oldest log - we set unable_to_flush_oldest_log_ = true on the oldest log. #### In the 2pc case: T1 enters function but is unable to flush all CFs to release log T1 sets unable_to_flush_oldest_log_ = true T1 begins flushing all CFs possible T2 enters function but is unable to flush all CFs to release log T2 sees unable_to_flush_oldes_log_ has been set so exits T3 enters function and will be able to flush all CFs to release oldest log T3 sets getting_flushed = true on oldes Closes https://github.com/facebook/rocksdb/pull/1909 Differential Revision: D4646235 Pulled By: reidHoruff fbshipit-source-id: c8d0447
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DUMP_FORMAT.md
## RocksDB dump format
The version 1 RocksDB dump format is fairly simple:
1) The dump starts with the magic 8 byte identifier "ROCKDUMP"
2) The magic is followed by an 8 byte big-endian version which is 0x00000001.
3) Next are arbitrarily sized chunks of bytes prepended by 4 byte little endian number indicating how large each chunk is.
4) The first chunk is special and is a json string indicating some things about the creation of this dump. It contains the following keys:
* database-path: The path of the database this dump was created from.
* hostname: The hostname of the machine where the dump was created.
* creation-time: Unix seconds since epoc when this dump was created.
5) Following the info dump the slices paired into are key/value pairs.
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