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fix: Write padding into mmap file in case of SIGBUS (#34443)

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See also #34442

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
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congqixia 2024-07-05 17:44:09 +08:00 committed by GitHub
parent 233b8486ec
commit 6b4d977a10
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2 changed files with 45 additions and 2 deletions
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8
internal/core/src/mmap/Column.h
View File

@ -129,7 +129,9 @@ class ColumnBase {
size_ = size;
cap_size_ = size;
size_t mapped_size = cap_size_ + padding_;
// use exactly same size of file, padding shall be written in file already
// see also https://github.com/milvus-io/milvus/issues/34442
size_t mapped_size = cap_size_;
data_ = static_cast<char*>(mmap(
nullptr, mapped_size, PROT_READ, MAP_SHARED, file.Descriptor(), 0));
AssertInfo(data_ != MAP_FAILED,
@ -156,7 +158,9 @@ class ColumnBase {
mapping_type_(MappingType::MAP_WITH_FILE) {
SetPaddingSize(data_type);
size_t mapped_size = cap_size_ + padding_;
// use exact same size of file, padding shall be written in file already
// see also https://github.com/milvus-io/milvus/issues/34442
size_t mapped_size = cap_size_;
data_ = static_cast<char*>(mmap(
nullptr, mapped_size, PROT_READ, MAP_SHARED, file.Descriptor(), 0));
AssertInfo(data_ != MAP_FAILED,

39
internal/core/src/mmap/Utils.h
View File

@ -39,6 +39,33 @@ namespace milvus {
file.Path(), \
strerror(errno)));
/*
* If string field's value all empty, need a string padding to avoid
* mmap failing because size_ is zero which causing invalid arguement
* array has the same problem
* TODO: remove it when support NULL value
*/
constexpr size_t FILE_STRING_PADDING = 1;
constexpr size_t FILE_ARRAY_PADDING = 1;
inline size_t
PaddingSize(const DataType& type) {
switch (type) {
case DataType::JSON:
// simdjson requires a padding following the json data
return simdjson::SIMDJSON_PADDING;
case DataType::VARCHAR:
case DataType::STRING:
return FILE_STRING_PADDING;
break;
case DataType::ARRAY:
return FILE_ARRAY_PADDING;
default:
break;
}
return 0;
}
inline void
WriteFieldData(File& file,
DataType data_type,
@ -128,5 +155,17 @@ WriteFieldData(File& file,
total_written += data->Size(i);
}
}
// write padding 0 in file content directly
// see also https://github.com/milvus-io/milvus/issues/34442
auto padding_size = PaddingSize(data_type);
if (padding_size > 0 ) {
std::vector<char> padding(padding_size, 0);
ssize_t written = file.Write(padding.data(), padding_size);
if (written < padding_size) {
THROW_FILE_WRITE_ERROR
}
total_written += written;
}
}
} // namespace milvus