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Modify write to correctly set length on new object creation.

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This commit is contained in:
Ben Thompson
2019-05-29 10:01:20 -05:00
parent b85030b164
commit a817b170d3
3 changed files with 18 additions and 5 deletions
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10
src/IOCoordinator.cpp
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@@ -319,15 +319,15 @@ int IOCoordinator::_write(const char *filename, const uint8_t *data, off_t offse
// there is no overlapping data, or data goes beyond end of last object
while (dataRemaining > 0)
{
metadataObject newObject = metadata.addMetadataObject(filename,0);
off_t newObjectOffset = metadata.getMetadataNewObjectOffset();
// count is 0 so first write is beyond current end of file.
// offset is > than newObject.offset so we need to adjust offset for object
// unless offset is beyond newObject.offset + objectSize then we need to write null data to this object
if (count == 0 && (uint64_t) offset > newObject.offset)
if (count == 0 && offset > newObjectOffset)
{
//this is starting beyond last object in metadata
//figure out if the offset is in this object
objectOffset = offset - newObject.offset;
objectOffset = offset - newObjectOffset;
writeLength = min((objectSize - objectOffset),dataRemaining);
}
else
@@ -341,8 +341,8 @@ int IOCoordinator::_write(const char *filename, const uint8_t *data, off_t offse
// objectOffset is 0 unless the write starts beyond the end of data
// in that case need to add the null data to cachespace
cache->makeSpace(writeLength + objectOffset);
if ((writeLength + objectOffset) > newObject.length)
metadata.updateEntryLength(newObject.offset, (writeLength + objectOffset));
metadataObject newObject = metadata.addMetadataObject(filename,(writeLength + objectOffset));
// send to replicator
err = replicator->newObject(newObject.key.c_str(),&data[count],objectOffset,writeLength);

12
src/MetadataFile.cpp
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@@ -445,6 +445,18 @@ void MetadataFile::updateEntryLength(off_t offset, size_t newLength)
updateObj->length = newLength;
}
off_t MetadataFile::getMetadataNewObjectOffset()
{
off_t newObjectOffset = 0;
if (!mObjects.empty())
{
std::set<metadataObject>::reverse_iterator iLastObject = mObjects.rbegin();
newObjectOffset = iLastObject->offset + iLastObject->length;
}
return newObjectOffset;
}
metadataObject::metadataObject()
{}

1
src/MetadataFile.h
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@@ -69,6 +69,7 @@ class MetadataFile
// breaks a key into its consitituent fields
static void breakout(const std::string &key, std::vector<std::string> &out);
off_t getMetadataNewObjectOffset();
// this will be a singleton, which stores the config used
// by all MetadataFile instances so we don't have to keep bothering Config.
// members are public b/c i don't want to write accessors right now. Also who cares.