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Goals:

  1. Improve operability in the Hydrator Studio (Improvements to logs, metrics, debuggability)
  2. Improve usability in the Hydrator Studio (Redesign of bottom panel, etc)

Checklist

  • User stories documented (Bhooshan)
  • User stories reviewed (Nitin/Sree)
  • Design documented (Bhooshan/Brady)
  • Design reviewed (Nitin/Sree)

Use Cases:

Use Case 1: Improve Log Viewer

Problems with current Log Viewer:

  • Doesn't cater to usual developer interactions with logs - tail'ing (with log file monitoring -f) or less'ing (viewing the log) or downloading
  • Hard to distinguish between two log lines
  • Exception stack traces are virtually un-readable
  • Virtually no formatting in the UI - almost rendered as the logs appear from the backend, which is not ideal to an end-user
  • No search (even at the UI level)
  • No way to download logs
  • No way to distinguish whether logs are live or past
  • Error rendering macro 'jira' : Unable to locate Jira server for this macro. It may be due to Application Link configuration.

User Stories:

  • As a Hydrator/CDAP user, I want to be able to view my pipeline logs from both currently running pipelines as well as past pipelines to effectively debug the pipeline during failures
  • As a Hydrator/CDAP user, I want to clearly know if the logs I am viewing are being updated live or are from a past run
  • As a Hydrator/CDAP user, I want greater emphasis on the most important part of logs - the messages
  • As a Hydrator user, I do not want logs to be flooded with stack traces. I want the ability to suppress them individually and as a whole
  • As a Hydrator/CDAP user, I want the ability to download complete log files
  • As a Hydrator/CDAP user, I want to view a summary of the logs I'm viewing (the number of messages, the number of errors, the number of warnings)
  • As a Hydrator/CDAP user, I want to be able to filter logs by the lowest log level
  • As a Hydrator/CDAP user, I want to be able to filter logs by keywords
  • As a Hydrator/CDAP user, I want to be able to view a larger number of log events with a single-line summary for each, with the capability to drill down into particular events as desired
  • As a Hydrator/CDAP user, I want to be able to view logs in the selected time range. I want to be able to dynamically change the time range for which I want to view logs, with context about how that time range maps to the duration of the program/service run.
  • As a Hydrator/CDAP user, I want to be able to be able to maximize the log viewer to full screen size and restore it to original size as required.

Design:

  1. Timeline:
    1. Starts at the program/service start time. Ends at the program/service end time (past) or current.
    2. Time range indicated by two sliders on each side. Time range can be selected by sliding these sliders.
    3. Updating slider position causes a refresh of the log viewer to show logs in the selected range with the selected filters
    4. If program/service is still running, the right/bottom end of the slider indicates current time, and if the slider is at this position, logs are updated live. The timeline keeps updating to reflect that.
    5. Sliders must not cross each other
    6. Label on the selected time range indicates the selected time range
    7. The timeline is marked with time range with granularity that depends on the duration of the log (which is the duration of the program run). 
  2. Filters:
    1. Filter by lowest log level: 
      1. If ERROR is selected, then we show only ERROR
      2. If WARN is selected, then we show ERROR and WARN
      3. If INFO is selected, then we show ERROR, WARN and INFO
      4. If DEBUG is selected, then we show ERROR, WARN, INFO and DEBUG
      5. If TRACE is selected, then we show ERROR, WARN, INFO, DEBUG and TRACE
    2. Filter by search keywords:
      1. Search box that filters logs by the search text.
      2. This is a simple filter that applies on the message column
  3. Log viewer Table:
    1. Columns:
      1. Timestamp
      2. Lowest Log Level
      3. Source - Only in CDAP - This column should not be shown in Hydrator
      4. Message (also contains stack trace).
    2. Default view shows single line messages, with (plus)/(minus) buttons to expand individual messages if they have more content
    3. Ability to suppress/show stack trace with a similar (plus)/(minus) buttons.
    4. Ability to expand all messages
    5. Ability to only view  the message column
  4. Top Bar:
    1. Shows information/summary of the log
    2. Indicates program/service name
    3. Summary of total messages with number of warnings and errors
    4. Download button to download entire log
    5. Search box for filtering.

 

Backend support:

 

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Use Case 2: Bottom Panel

Problems with bottom panel:

  • Constant back-and forth between DAG and bottom panel - click on a node, then view the bottom panel - not very intuitive
  • Reserved real-estate for configurations that are not commonly updated
  • Schema available in both bottom panel as well as the DAG
  • Reduced "prominance" for both the DAG as well as the bottom panel, since you're not using the full available space ever
  • Restricted space in the bottom panel for logs, pipeline configuration, node configuration, etc
  • Association between a DAG and its bottom panel is not always clear enough

User Stories:

  • As a Hydrator Product Team, I want to better plan the Hydrator real-estate so it is not statically allocated for configurations/views that are not commonly used/mandatory to be updated for creating pipelines
    • e.g. Pipeline configurations like post run actions, engine, schedule
  • As a Hydrator Product Team, I want to better design the Hydrator UI to lay more emphasis on the DAG
  • As a Hydrator user, I do not want to switch back-and-forth between the DAG and the bottom panel repeatedly for building my pipeline
    • I should be able to provide node-level details right near the node
    • I should be able to simultaneously view details for multiple nodes both while editing a pipeline as well as viewing it.
  • As a Hydrator user, I want to be able to build my pipeline incrementally. I want mandatory information to be more obvious.
    • Build the pipeline with mandatory fields only to start off
    • Incrementally add schedule, post run actions, etc
  • As a Hydrator Product Team, I want remove the disparity between the pipeline detail view and the studio view. This will facilitate the move towards being able to edit a pipeline after publishing
    • e.g. Reference is unavailable in the pipeline details view
  • As a Hydrator user, I want the messaging regarding multiple runs from the Hydrator UI to be clearer.
    • Does Hydrator only always show the last run?
    • If so, what is the "History" view for
  • As a Hydrator Product Team, I want to reduce duplication
    • The console is not very useful today, it just shows messages. Can it be reconciled with the notification center?
  • As a Hydrator user, I want related actions to appear together. 
    • e.g. "Export" is available in the bottom panel, but other pipeline controls are in the top bar.
  • As a Hydrator Product team, I want to bring Jump buttons to Hydrator to make them the primary method of viewing entities in different contexts across CDAP, Hydrator and Tracker
    • Jump from pipeline details view in Hydrator to program details view in CDAP
    • Jump actions for source/sink in Hydrator:
      • View in Dataset Details page in CDAP
      • View in entity details page in Tracker
      • Explore Dataset (if possible) in CDAP

 Design:

Use Case 2: Debuggability/Testing

User Stories:

Design:

Work Streams:


 Tech Debt

  • Simplify Config Store
  • Simplify DAG component ~ Ajai's hack

Moving hard-coding/logic to backend

  • Drafts
  • Default plugin version
  • For a stage, define whether it can accept an Input, Output or both
  • Single APIs for status/logs/metrics for hydrator pipelines

New features

  • Preview
  • Log Viewer

 

Scratch Pad:


 

   Possible solutions

 

  • Tabular view: Columns for date, Class Name/Thread Name, Log Level, Log Line
  • Alternate row background colors
  • Vertically expandable with scrolling
  • Searchable (Filter-able) columns
  • Clear demarcation of rows
  • Snippet with expand - especially for stack traces
  • Picking only 1 or more log level -INFO, DEBUG, WARN, ERROR, ALL
  • Ability to view and download raw logs if required
  • Ability to view and expand only the "content" column of a log line



 

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