importer: log when the transaction index for FileStorage DB is built

neo/lib/patch.py

@@ -25,6 +25,7 @@ def speedupFileStorageTxnLookup():
     from array import array
     from bisect import bisect
     from collections import defaultdict
+    from neo.lib import logging
     from ZODB.FileStorage.FileStorage import FileStorage, FileIterator
 
     typecode = 'L' if array('I').itemsize < 4 else 'I'
@@ -44,6 +45,8 @@ def speedupFileStorageTxnLookup():
             try:
                 index = self._tidindex
             except AttributeError:
+                logging.info("Building index for faster lookup of"
+                             " transactions in the FileStorage DB.")
                 # Cache a sorted list of all the file pos from oid index.
                 # To reduce memory usage, the list is splitted in arrays of
                 # low order 32-bit words.
@@ -55,6 +58,7 @@ def speedupFileStorageTxnLookup():
                     l = array(typecode, sorted(l))
                     x = self._read_data_header(h << 32 | l[0])
                     index.append((x.tid, h, l))
+                logging.info("... index built")
             x = bisect(index, (start,)) - 1
             if x >= 0:
                 x, h, index = index[x]