#1925 (#2257)

* write error
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* out of storage
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* clang format
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* fix ut
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* fix #1955
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* refine code
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* compact threashold
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* changelog
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* search by id for hnsw/pq/annoy
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* fix python test
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* file cleanup timeout config
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* typo
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* changelog
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* #1925\
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* typo
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

CHANGELOG.md

@@ -7,6 +7,7 @@ Please mark all change in change log and use the issue from GitHub
 ## Bug
 -   \#1705 Limit the insert data batch size
 -   \#1776 Error out when index SQ8H run in CPU mode
+-   \#1925 To flush all collections, flush cannot work
 -   \#1929 Skip MySQL meta schema field width check
 -   \#1946 Fix load index file CPU2GPU fail during searching
 -   \#1955 Switch create_index operation to background once client break connection

core/src/server/delivery/request/FlushRequest.cpp

@@ -49,6 +49,13 @@ FlushRequest::OnExecute() {
     Status status = Status::OK();
     LOG_SERVER_DEBUG_ << hdr;
 
+    // flush all collections
+    if (collection_names_.empty()) {
+        status = DBWrapper::DB()->Flush();
+        return status;
+    }
+
+    // flush specified collections
     for (auto& name : collection_names_) {
         // only process root collection, ignore partition collection
         engine::meta::CollectionSchema collection_schema;