Make the 'compact_range' call available in python
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4 changed files with 69 additions and 2 deletions
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@ -247,6 +247,38 @@ Database object
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``largest_seqno``
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largest seqno in file
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.. py:method:: compact_range(begin=None, end=None, reduce_level=False, target_level=-1)
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Compact the underlying storage for the key range [begin,end].
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The actual compaction interval might be superset of [begin, end].
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In particular, deleted and overwritten versions are discarded,
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and the data is rearranged to reduce the cost of operations
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needed to access the data.
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This operation should typically only be invoked by users who understand
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the underlying implementation.
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``begin == None`` is treated as a key before all keys in the database.
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``end == None`` is treated as a key after all keys in the database.
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Therefore the following call will compact the entire database: ``db.compact_range()``.
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Note that after the entire database is compacted, all data are pushed
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down to the last level containing any data. If the total data size
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after compaction is reduced, that level might not be appropriate for
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hosting all the files. In this case, client could set reduce_level
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to ``True``, to move the files back to the minimum level capable of holding
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the data set or a given level (specified by non-negative target_level).
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:param bytes begin: Key where to start compaction.
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If ``None`` start at the beginning of the database.
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:param bytes end: Key where to end compaction.
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If ``None`` end at the last key of the database.
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:param bool reduce_level: If ``True`` allow rocksdb to move the data to
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another level, if the current is not big enouth.
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If ``False`` you may end with a bigger level
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than configured.
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:param int target_level: Level where to push the the range to compact.
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.. py:attribute:: options
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@ -1537,6 +1537,34 @@ cdef class DB(object):
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return ret
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def compact_range(self, begin=None, end=None, reduce_level=False, target_level=-1):
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cdef Status st
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cdef Slice begin_val
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cdef Slice end_val
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cdef Slice* begin_ptr
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cdef Slice* end_ptr
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begin_ptr = NULL
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end_ptr = NULL
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if begin is not None:
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begin_val = bytes_to_slice(begin)
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begin_ptr = cython.address(begin_val)
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if end is not None:
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end_val = bytes_to_slice(end)
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end_ptr = cython.address(end_val)
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st = self.db.CompactRange(
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begin_ptr,
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end_ptr,
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reduce_level,
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target_level)
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check_status(st)
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@staticmethod
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def __parse_read_opts(
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verify_checksums=False,
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@ -91,10 +91,10 @@ cdef extern from "rocksdb/db.h" namespace "rocksdb":
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int,
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uint64_t*) nogil except+
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void CompactRange(
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Status CompactRange(
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const Slice*,
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const Slice*,
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bool,
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cpp_bool,
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int) nogil except+
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int NumberLevels() nogil except+
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@ -188,6 +188,13 @@ class TestDB(unittest.TestCase, TestHelper):
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self.assertIsNotNone(self.db.get_property(b'rocksdb.num-files-at-level0'))
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self.assertIsNone(self.db.get_property(b'does not exsits'))
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def test_compact_range(self):
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for x in range(10000):
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x = int_to_bytes(x)
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self.db.put(x, x)
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self.db.compact_range()
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class AssocCounter(rocksdb.interfaces.AssociativeMergeOperator):
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def merge(self, key, existing_value, value):
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