s/tests: added test validating concurrent operations

Added a test validating concurrent operations of writing and prefix
truncating a log.

Signed-off-by: Michał Maślanka <michal@redpanda.com>

src/v/storage/tests/storage_e2e_test.cc

@@ -50,6 +50,7 @@
 #include <fmt/chrono.h>
 
 #include <algorithm>
+#include <chrono>
 #include <iterator>
 #include <numeric>
 #include <optional>
@@ -887,7 +888,8 @@ ss::future<storage::append_result> append_exactly(
   ss::shared_ptr<storage::log> log,
   size_t batch_count,
   size_t batch_sz,
-  std::optional<bytes> key = std::nullopt) {
+  std::optional<bytes> key = std::nullopt,
+  model::record_batch_type batch_type = model::record_batch_type::raft_data) {
     vassert(
       batch_sz > model::packed_record_batch_header_size,
       "Batch size must be greater than {}, requested {}",
@@ -925,8 +927,7 @@ ss::future<storage::append_result> append_exactly(
     val_sz -= real_batch_size;
 
     for (int i = 0; i < batch_count; ++i) {
-        storage::record_batch_builder builder(
-          model::record_batch_type::raft_data, model::offset{});
+        storage::record_batch_builder builder(batch_type, model::offset{});
         iobuf value = bytes_to_iobuf(random_generators::get_bytes(val_sz));
         builder.add_raw_kv(key_buf.copy(), std::move(value));
 
@@ -1007,6 +1008,98 @@ FIXTURE_TEST(write_concurrently_with_gc, storage_test_fixture) {
       model::offset(9 + appends * batches_per_append));
 };
 
+/**
+ * This test executes operations which may be executed by Raft layer without
+ * synchronization. i.e. appends, reads, flushes and prefix truncations. The
+ * test validates if the offsets are correctly assigned i.e. if any batch did
+ * not get the same offset assigned twice.
+ */
+FIXTURE_TEST(append_concurrent_with_prefix_truncate, storage_test_fixture) {
+    auto cfg = default_log_config(test_dir);
+
+    ss::abort_source as;
+    storage::log_manager mgr = make_log_manager(cfg);
+    model::offset last_append_offset{};
+    auto deferred = ss::defer([&mgr]() mutable { mgr.stop().get(); });
+    auto ntp = model::controller_ntp;
+
+    storage::ntp_config ntp_cfg(ntp, mgr.config().base_dir);
+    auto log = mgr.manage(std::move(ntp_cfg)).get0();
+
+    bool stop = false;
+    int cnt = 0;
+    std::vector<model::record_batch_type> types{
+      model::record_batch_type::raft_data,
+      model::record_batch_type::raft_configuration};
+    auto append = [&] {
+        return append_exactly(
+                 log,
+                 1,
+                 random_generators::get_int(75, 237),
+                 std::nullopt,
+                 random_generators::random_choice(types))
+          .then([&](storage::append_result result) {
+              info("append result: {}", result);
+              vassert(
+                result.last_offset > last_append_offset,
+                "Got the same append offset twice, last append_offset: {}, "
+                "current result: {}",
+                last_append_offset,
+                result.last_offset);
+              last_append_offset = result.last_offset;
+              cnt++;
+              if (cnt == 1000) {
+                  stop = true;
+              }
+              return ss::sleep(
+                std::chrono::milliseconds(random_generators::get_int(10, 100)));
+          });
+    };
+
+    auto flush = [&] { return log->flush().discard_result(); };
+
+    auto read = [&] {
+        auto lstats = log->offsets();
+        return log
+          ->make_reader(storage::log_reader_config(
+            lstats.start_offset,
+            model::offset::max(),
+            ss::default_priority_class()))
+          .then([](auto reader) {
+              return ss::sleep(24ms)
+                .then([r = std::move(reader)]() mutable {
+                    return model::consume_reader_to_memory(
+                      std::move(r), model::no_timeout);
+                })
+                .discard_result();
+          });
+    };
+
+    auto prefix_truncate = [&] {
+        auto offset = model::next_offset(log->offsets().dirty_offset);
+
+        return log
+          ->truncate_prefix(storage::truncate_prefix_config(
+            offset, ss::default_priority_class()))
+          .then([offset] {
+              info("prefix truncate at: {}", offset);
+              return ss::sleep(
+                std::chrono::milliseconds(random_generators::get_int(5, 20)));
+          });
+    };
+    /**
+     * Execute all operations concurrently
+     */
+    auto f_1 = ss::do_until([&] { return stop; }, [&] { return append(); });
+    auto f_2 = ss::do_until(
+      [&] { return stop; }, [&] { return prefix_truncate(); });
+    auto f_3 = ss::do_until([&] { return stop; }, [&] { return read(); });
+    auto f_4 = ss::do_until([&] { return stop; }, [&] { return flush(); });
+
+    ss::when_all(std::move(f_1), std::move(f_2), std::move(f_3), std::move(f_4))
+      .get();
+};
+
 FIXTURE_TEST(empty_segment_recovery, storage_test_fixture) {
     auto cfg = default_log_config(test_dir);
     auto ntp = model::ntp("default", "test", 0);