muthukumardce@gmail.com wrote:
Full_Name: Muthukumar Version: LMDB 0.82 OS: OSX URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (49.207.184.177)
# Writer
import lmdb db_path = "test.db" DB_MAX_SIZE = 40 * 1000 * 1000 * 1000 env = lmdb.Environment(db_path, DB_MAX_SIZE, sync=True) txn = env.begin(write=True, buffers=True) for i in xrange(5000000): value = "*" * 100 txn.put("i="+str(i), value) txn.commit()I ran the above python program in my machine which took almost 8 secs to complete. Simultaneously i try to copy the database using mdb_copy, but it started copying only after the write program completes its execution.
Please note: First i run the writer program then the mdb_copy, if i start mdb_copy first it runs smoothly.
Please help.
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The mdb_copy program needs to acquire the DB write mutex before executing, to ensure it gets a consistent snapshot. It obviously can't do that until any other active writer finishes.
Closing this ITS.