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Bug fix. The snapshot dispatch add task retry loop was incorrectly deciding that the second and further transaction of an execution was already committed and therefore skipping it, resulting in missing ranges in the snapshot.

This commit is contained in:
Stephen Atherton 2017-12-17 21:01:31 -08:00
parent afd2603576
commit 2b92815e8c
1 changed files with 9 additions and 10 deletions
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19
fdbclient/FileBackupAgent.actor.cpp
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@ -1197,7 +1197,6 @@ namespace fileBackup {
shardMap.coalesce(normalKeys);
// In this context "all" refers to all of the shards relevant for this particular backup
state int countAllShards = countShardsDone + countShardsNotDone;
@ -1244,8 +1243,6 @@ namespace fileBackup {
state std::vector<KeyRange> rangesToAdd;
int added = 0;
while(countShardsToDispatch > 0 && added < taskBatchSize && shardMap.size() > 0) {
// Get a random range.
auto it = shardMap.randomRange();
// Find a NOT_DONE range and add it to rangesToAdd
@ -1267,6 +1264,8 @@ namespace fileBackup {
}
state int64_t oldBatchSize = snapshotBatchSize.get();
state int64_t newBatchSize = oldBatchSize + rangesToAdd.size();
// Now add the ranges in a single transaction
tr->reset();
loop {
@ -1286,15 +1285,15 @@ namespace fileBackup {
Void _ = wait(store(config.snapshotBatchSize().getOrThrow(tr), snapshotBatchSize.get())
&& waitForAll(beginReads) && waitForAll(endReads) && taskBucket->keepRunning(tr, task));
// If the snapshot batch size was already changed to oldBatchSize + rangesToAdd.size() then this transaction
// was already committed
if(snapshotBatchSize.get() == oldBatchSize) {
config.snapshotBatchSize().set(tr, oldBatchSize + rangesToAdd.size());
// Snapshot batch size should be either oldBatchSize or newBatchSize. If new, this transaction is already done.
if(snapshotBatchSize.get() == newBatchSize) {
break;
}
else {
ASSERT(snapshotBatchSize.get() == oldBatchSize + rangesToAdd.size());
break;
}
ASSERT(snapshotBatchSize.get() == oldBatchSize);
config.snapshotBatchSize().set(tr, newBatchSize);
snapshotBatchSize = newBatchSize;
}
// Count the undispatched ranges while checking the boundaries
int undispatchedRanges = 0;