tmp

velox/common/caching/SsdFile.cpp

@@ -492,6 +492,20 @@ bool SsdFile::write(
         << ", size: " << iovecs.size() << ", offset: " << offset
         << ", error code: " << errno
         << ", error string: " << folly::errnoStr(errno);
+    // 1. The file descriptor fd is not valid.
+    // 2. The array of buffers iov is null or has a null pointer in it.
+    // 3. The number of buffers iovcnt is less than 1 or greater than UIO_MAXIOV.
+    // 4. The offset offset is negative or greater than the size of the file.
+    auto fd = writeDataFile_->fd();
+    VELOX_SSD_CACHE_LOG(ERROR) << " fd " << fd;
+    int flags = fcntl(fd, F_GETFD);
+    VELOX_SSD_CACHE_LOG(ERROR) << "fd flags: " << flags << " err: " << folly::errnoStr(errno);
+    VELOX_SSD_CACHE_LOG(ERROR) << " iovecs ";
+    for (const auto iovec :iovecs) {
+      VELOX_SSD_CACHE_LOG(ERROR) << "iov_base == nullptr: " << (iovec.iov_base == nullptr) << " len " << iovec.iov_len;
+    }
+    VELOX_SSD_CACHE_LOG(ERROR) << " iovcnt " <<  iovecs.size();
+    VELOX_SSD_CACHE_LOG(ERROR) << " offset " <<  offset;
     ++stats_.writeSsdErrors;
     return false;
   }

velox/common/file/File.h

@@ -191,6 +191,10 @@ class WriteFile {
   /// be needed to get the exact size written, and this should be able to be
   /// called after the file close.
   virtual uint64_t size() const = 0;
+
+  virtual int32_t fd() {
+    VELOX_NYI("{} is not implemented", __FUNCTION__);
+  }
 };
 
 // We currently do a simple implementation for the in-memory files
@@ -349,6 +353,11 @@ class LocalWriteFile final : public WriteFile {
     return size_;
   }
 
+  int32_t fd() {
+    return fd_;
+  }
+
+
  private:
   // File descriptor.
   int32_t fd_{-1};