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In a meantime elliptics network got a little bit harden node crash management – all transactions which were not sent prior node crash will be resent to another nodes according to the changed routing table. This was only slightly tested though, since real-life examples are a bit hard to catch. I will write a test script, which will write to the node which will forward all requests to another one, a
libeblob is an append-only low-level IO library, which saves data in blob files. Following features are already supported: fast append-only updates which do not require disk seeks compact index to populate lookup information from disk multi-threaded index reading during starup O(1) data location lookup time ability to lock in-memory lookup index (hash table) to eliminate memory swap readahead game
Bonnie++ benchmark of the latest DST version. Previously released versions used blk_alloc_queue() for block IO queue allocation. This is rather simple fuction which does not do anything special. It happend that with the last kenels this does not attach IO elevator (also known as IO scheduler, subsystem which may reorder and combine multiple requests into single one to improve performance), so all
New release with huge number of improvements, the most notable of which are column data storage (eblob only) range requests faster metadata and overall IO performance server-side checksumming and verification support base for ultra-fast recovery and local mapreduce simplified interfaces for POHMELFS So far this is a beta release, since not all API calls were propagated to high-level interfaces. Th
In a meantime I rewrote pohmelfs from scratch and it enters heavy testing stage. As promised, it became just a POSIX frontend to elliptics network with weak synchronization. By using elliptics as its backend, it gets multiple copies support, atomic transactions (in single replica), multiple datacenter support with IO balance, checksums, namespaces and so on. And by ‘weak synchronization’ here I me
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