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----
-breadcrumbs:
-- - /developers
-  - For Developers
-- - /developers/design-documents
-  - Design Documents
-page_name: download
-title: Download
----
-
-**Diagnose download issues**
-
-Download used to use NetLog for logging purpose, as it is considered part of the
-network operation. With network servicification, NetLog will no longer be
-accessible outside the network process. As a result, download is switching to
-TraceEvent for logging.
-
-# Netlog format (this is deprecated)
-
-For a DownloadItem, its netlog looks like this:
-
-#### 21571799: DOWNLOAD
-
-#### gzip-1.3.9.tar
-
-Start Time: 2017-11-06 11:36:31.319
-
-t=81821 \[st= 0\] +DOWNLOAD_ITEM_ACTIVE \[dt=539\]
---> danger_type = "NOT_DANGEROUS"
---> file_name = "gzip-1.3.9.tar"
---> final_url = "http://ftp.gnu.org/gnu/gzip/gzip-1.3.9.tar"
---> has_user_gesture = true
---> id = "3640"
---> original_url = "http://ftp.gnu.org/gnu/gzip/gzip-1.3.9.tar"
---> start_offset = "0"
---> type = "NEW_DOWNLOAD"
-t=81821 \[st= 0\] DOWNLOAD_URL_REQUEST
---> source_dependency = 21571791 (URL_REQUEST)
-t=81822 \[st= 1\] DOWNLOAD_FILE_CREATED
---> source_dependency = 21571800 (DOWNLOAD_FILE)
-t=81825 \[st= 4\] DOWNLOAD_ITEM_UPDATED
---> bytes_so_far = "0"
-t=81833 \[st= 12\] DOWNLOAD_ITEM_SAFETY_STATE_UPDATED
---> danger_type = "MAYBE_DANGEROUS_CONTENT"
-t=81865 \[st= 44\] DOWNLOAD_ITEM_RENAMED
---> new_filename = "/usr/local/google/home/qinmin/Downloads/Unconfirmed
-246585.crdownload"
---> old_filename = ""
-t=82304 \[st=483\] DOWNLOAD_ITEM_UPDATED
---> bytes_so_far = "1648640"
-t=82305 \[st=484\] DOWNLOAD_ITEM_UPDATED
---> bytes_so_far = "1648640"
-t=82360 \[st=539\] DOWNLOAD_ITEM_RENAMED
---> new_filename = "/usr/local/google/home/qinmin/Downloads/gzip-1.3.9.tar"
---> old_filename = "/usr/local/google/home/qinmin/Downloads/Unconfirmed
-246585.crdownload"
-t=82360 \[st=539\] DOWNLOAD_ITEM_COMPLETING
---> bytes_so_far = "1648640"
---> final_hash =
-"A08ABC68B607A70450930E698A90A0C30C81CE45A656CC47D2B89CA87C059DF6"
-t=82360 \[st=539\] DOWNLOAD_ITEM_FINISHED
---> auto_opened = "no"
-
-For a DownloadFile, it looks like:
-
-#### 21571800: DOWNLOAD_FILE
-
-Start Time: 2017-11-06 11:36:31.320
-
-t=81822 \[st= 0\] +DOWNLOAD_FILE_ACTIVE \[dt=538\]
---> source_dependency = 21571799 (DOWNLOAD)
-t=81822 \[st= 0\] +DOWNLOAD_FILE_OPENED \[dt=43\]
---> file_name =
-"/usr/local/google/home/qinmin/.local/share/.com.google.Chrome.pzFBTU"
---> start_offset = "0"
-t=81822 \[st= 0\] DOWNLOAD_STREAM_DRAINED
---> num_buffers = 0
---> stream_size = 0
-t=81865 \[st= 43\] -DOWNLOAD_FILE_OPENED
-t=81865 \[st= 43\] DOWNLOAD_FILE_RENAMED \[dt=0\]
---> new_filename = "/usr/local/google/home/qinmin/Downloads/Unconfirmed
-246585.crdownload"
---> old_filename =
-"/usr/local/google/home/qinmin/.local/share/.com.google.Chrome.pzFBTU"
-t=81865 \[st= 43\] +DOWNLOAD_FILE_OPENED \[dt=493\]
---> file_name = "/usr/local/google/home/qinmin/Downloads/Unconfirmed
-246585.crdownload"
---> start_offset = "0"
-t=81883 \[st= 61\] DOWNLOAD_FILE_WRITTEN \[dt=0\]
---> bytes = "2262"
-
-…...
-t=82304 \[st=482\] DOWNLOAD_FILE_WRITTEN \[dt=0\]
---> bytes = "2582"
-t=82358 \[st=536\] -DOWNLOAD_FILE_OPENED
-t=82358 \[st=536\] DOWNLOAD_STREAM_DRAINED
---> num_buffers = 2
---> stream_size = 10898
-t=82359 \[st=537\] DOWNLOAD_FILE_RENAMED \[dt=0\]
---> new_filename = "/usr/local/google/home/qinmin/Downloads/gzip-1.3.9.tar"
---> old_filename = "/usr/local/google/home/qinmin/Downloads/Unconfirmed
-246585.crdownload"
-t=82359 \[st=537\] DOWNLOAD_FILE_ANNOTATED \[dt=0\]
-t=82360 \[st=538\] DOWNLOAD_FILE_DETACHED
-t=82360 \[st=538\] -DOWNLOAD_FILE_ACTIVE
-
-# Collect trace event
-
-To start tracing, open Chrome and type in chrome://tracing in the URL bar, Click
-on the record button and click on the “Edit Categories” button, check the
-“download” category and uncheck all other categories, then hit the record
-button.
-
-# Migrating to Trace Event
-
-With trace event, we still want to group most of the file operations and
-download events under the same download. Otherwise, it will be hard to analyze
-the trace if multiple downloads are on going. The downloadId is passed from
-DownloadItem to DownloadFile, so it could be used to group all the nestable
-events.
-
-Because DownloadFile and DownloadItem live on different thread, DownloadFile’s
-trace may outlive DownloadFile’s although the former is created later. As a
-result, we will still keep the DownloadFile and DownloadItem events into
-separate nestable groups.
-
-Trace event is thread based, so instant events will not be grouped to into any
-nestable events. A possible solution is to make any instant events a nestable
-async events, but that doesn’t seems very necessary.
-
-The trace event will contain all the information captured by the previous
-NetLog, and will be shown in the following format:
-
-<img alt="image"
-src="https://docs.google.com/a/google.com/drawings/d/sGXr-eMkBNj31sftVEkr-7A/image?w=595&h=127&rev=33&ac=1&fmt=svg"
-height=127 width=595>
-
-As see in the graph, most of the download file events are grouped under
-DownloadFileActive group. Instant events doesn’t belong to any group, and could
-take place on different threads.
-
-Events under DownloadFileActive include DownloadFileOpen and DownloadFileWrite.
-
-Events under CrBrowserMain include most of the DownloadItem event, such as
-DownloadStarted, DownloadItemUpdated, DownloadItemInterrupted,
-DownloadItemCancelled, DownloadItemRenamed, DownloadItemSafetyStateUpdated,
-DownloadItemCompleting, DownloadItemFinished and DownloadFileCreated event.
-
-There could be multiple TaskScheduler threads for the write to happen. So events
-like DownloadStreamDrained, DownloadFileRename, DownloadFileAnnotate,
-DownloadFileDetached.
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