From: Brian Warner <warner@allmydata.com>
Date: Tue, 10 Jun 2008 18:53:10 +0000 (-0700)
Subject: storage: ignore shares in incoming/, to make clients use other servers during simulta... 
X-Git-Tag: allmydata-tahoe-1.1.0~27
X-Git-Url: https://git.rkrishnan.org/components/com_hotproperty/%22doc.html/banana.xhtml?a=commitdiff_plain;h=814922a9a151018e06536a05a5eb3ea7d502904e;p=tahoe-lafs%2Ftahoe-lafs.git

storage: ignore shares in incoming/, to make clients use other servers during simultaneous uploads
---

diff --git a/src/allmydata/storage.py b/src/allmydata/storage.py
index 5687aadf..7bee77d5 100644
--- a/src/allmydata/storage.py
+++ b/src/allmydata/storage.py
@@ -772,8 +772,7 @@ class StorageServer(service.MultiService, Referenceable):
         # they asked about: this will save them a lot of work. Add or update
         # leases for all of them: if they want us to hold shares for this
         # file, they'll want us to hold leases for this file.
-        for (shnum, fn) in chain(self._get_bucket_shares(storage_index),
-                                 self._get_incoming_shares(storage_index)):
+        for (shnum, fn) in self._get_bucket_shares(storage_index):
             alreadygot.add(shnum)
             sf = ShareFile(fn)
             sf.add_or_renew_lease(lease_info)
@@ -785,9 +784,15 @@ class StorageServer(service.MultiService, Referenceable):
         for shnum in sharenums:
             incominghome = os.path.join(self.incomingdir, si_dir, "%d" % shnum)
             finalhome = os.path.join(self.sharedir, si_dir, "%d" % shnum)
-            if os.path.exists(incominghome) or os.path.exists(finalhome):
+            if os.path.exists(finalhome):
                 # great! we already have it. easy.
                 pass
+            elif os.path.exists(incominghome):
+                # Note that we don't create BucketWriters for shnums that
+                # have a partial share (in incoming/), so if a second upload
+                # occurs while the first is still in progress, the second
+                # uploader will use different storage servers.
+                pass
             elif no_limits or remaining_space >= space_per_bucket:
                 # ok! we need to create the new share file.
                 bw = BucketWriter(self, incominghome, finalhome,
diff --git a/src/allmydata/test/test_storage.py b/src/allmydata/test/test_storage.py
index 5b389e5a..26f64a86 100644
--- a/src/allmydata/test/test_storage.py
+++ b/src/allmydata/test/test_storage.py
@@ -261,6 +261,7 @@ class Server(unittest.TestCase):
         # while the buckets are open, they should not count as readable
         self.failUnlessEqual(ss.remote_get_buckets("vid"), {})
 
+        # close the buckets
         for i,wb in writers.items():
             wb.remote_write(0, "%25d" % i)
             wb.remote_close()
@@ -278,11 +279,10 @@ class Server(unittest.TestCase):
         self.failUnlessEqual(set(writers.keys()), set([3,4]))
 
         # while those two buckets are open for writing, the server should
-        # tell new uploaders that they already exist (so that we don't try to
-        # upload into them a second time)
+        # refuse to offer them to uploaders
 
         already,writers = self.allocate(ss, "vid", [2,3,4,5], 75)
-        self.failUnlessEqual(already, set([0,1,2,3,4]))
+        self.failUnlessEqual(already, set([0,1,2]))
         self.failUnlessEqual(set(writers.keys()), set([5]))
 
     def test_sizelimits(self):
@@ -465,11 +465,19 @@ class Server(unittest.TestCase):
         self.failUnlessEqual(len(writers), 5)
         already2,writers2 = ss.remote_allocate_buckets("si3", rs4, cs4,
                                                        sharenums, size, canary)
-        self.failUnlessEqual(len(already2), 5)
+        self.failUnlessEqual(len(already2), 0)
         self.failUnlessEqual(len(writers2), 0)
         for wb in writers.values():
             wb.remote_close()
 
+        leases = list(ss.get_leases("si3"))
+        self.failUnlessEqual(len(leases), 1)
+
+        already3,writers3 = ss.remote_allocate_buckets("si3", rs4, cs4,
+                                                       sharenums, size, canary)
+        self.failUnlessEqual(len(already3), 5)
+        self.failUnlessEqual(len(writers3), 0)
+
         leases = list(ss.get_leases("si3"))
         self.failUnlessEqual(len(leases), 2)