U /e@sxddlmZddlZddlZddlZddlZddlmZmZddl m Z m Z ddl m Z ddlmZGddde ZdS) ) annotationsN)BinaryIOCallable) ShardsBuffer ShardType)ResourceLimiter) log_errorscsfeZdZdZdZddddddfd d Zdd d d ddZdd dddZd dfdd ZZ S)DiskShardsBufferaAccept, buffer, and write many small objects to many files This takes in lots of small objects, writes them to a local directory, and then reads them back when all writes are complete. It buffers these objects in memory so that it can optimize disk access for larger writes. **State** - shards: dict[str, list[ShardType]] This is our in-memory buffer of data waiting to be written to files. - sizes: dict[str, int] The size of each list of shards. We find the largest and write data from that buffer State ----- memory_limit: str A maximum amount of memory to use, like "1 GiB" Parameters ---------- directory: pathlib.Path Where to write and read data. Ideally points to fast disk. dump: callable Writes an object to a file, like pickle.dump load: callable Reads an object from that file, like pickle.load sizeof: callable Measures the size of an object in memory Nstrz+Callable[[list[ShardType], BinaryIO], None]z%Callable[[BinaryIO], list[ShardType]]zResourceLimiter | None) directorydumploadmemory_limitercsFtj|ddt||_tj|js6t|j||_ ||_ dS)N)rconcurrency_limit) super__init__pathlibPathr ospathexistsmkdirr r)selfr r rr __class__=/tmp/pip-unpacked-wheel-g426oqom/distributed/shuffle/_disk.pyr2s  zDiskShardsBuffer.__init__zlist[ShardType]None)idshardsreturnc s\tL|d6t|jt|ddd}|||W5QRXW5QRXW5QRXdS)a'Write one buffer to file This function was built to offload the disk IO, but since then we've decided to keep this within the event loop (disk bandwidth should be prioritized, and writes are typically small enough to not be a big deal). Most of the logic here is about possibly going back to a separate thread, or about diagnostics. If things don't change much in the future then we should consider simplifying this considerably and dropping the write into communicate above. writeabmode bufferingN)rtimeopenr r r )rr r!frrr_processDs  zDiskShardsBuffer._processz int | str)r r"c Cs||jstdg}zP|d<t|jt|ddd}||}|}W5QRXW5QRXWnt k rt |YnX|r|j |7_ |St |dS)z%Read a complete file back into memoryz$Tried to read from file before done.readrbr%r&N) Zraise_on_exceptionZ _inputs_done RuntimeErrorr)r*r r rtellFileNotFoundErrorKeyError bytes_read)rr partsr+sizerrrr-Zs(    zDiskShardsBuffer.read)r"c s6tIdHttt|jW5QRXdS)N)rclose contextlibsuppressr1shutilrmtreer )rrrrr6rs zDiskShardsBuffer.close)N) __name__ __module__ __qualname____doc__rrr,r-r6 __classcell__rrrrr s!r ) __future__rr7rrr9typingrrZdistributed.shuffle._bufferrrZdistributed.shuffle._limiterrZdistributed.utilsrr rrrrs