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XCom_pull of multiple task_ids not returning the list values #41983

Closed as not planned
Closed as not planned
XCom_pull of multiple task_ids not returning the list values#41983
Labels
Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet

Description

@edulauer
edulauer
opened on Sep 3, 2024

Apache Airflow version

2.10.0

If "Other Airflow 2 version" selected, which one?

No response

What happened?

When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
In older versions of Airflow, such as 2.9.3, this issue did not occur.

What you think should happen instead?

It should return a list of values pushed by each task mentioned in the task_ids argument

How to reproduce

with DAG as dag:

push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

Operating System

Debian GNU/Linux 12

Versions of Apache Airflow Providers

No response

Deployment

Docker-Compose

Deployment details

FROM apache/airflow:2.10.0-python3.10

Anything else?

In older versions of Airflow, such as 2.9.3, this issue did not occur.

Error log:
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'

Are you willing to submit PR?

  • Yes I am willing to submit a PR!

Code of Conduct

Metadata

Metadata

Assignees

No one assigned

    Labels

    Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions

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var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
XCom_pull of multiple task_ids not returning the list values · Issue #41983 · apache/airflow · GitHub
      Skip to content
      XCom_pull of multiple task_ids not returning the list values #41983
      Closed as not planned
      Closed as not planned
      XCom_pull of multiple task_ids not returning the list values#41983
      Labels
      Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
      Description
      @edulauer
      edulauer
      opened on Sep 3, 2024
      Apache Airflow version
      2.10.0
      If "Other Airflow 2 version" selected, which one?
      No response
      What happened?
      When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
      
In older versions of Airflow, such as 2.9.3, this issue did not occur.
      What you think should happen instead?
      It should return a list of values pushed by each task mentioned in the task_ids argument
      How to reproduce
      with DAG as dag:
      push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

      Operating System
      Debian GNU/Linux 12
      Versions of Apache Airflow Providers
      No response
      Deployment
      Docker-Compose
      Deployment details
      FROM apache/airflow:2.10.0-python3.10
      Anything else?
      In older versions of Airflow, such as 2.9.3, this issue did not occur.
      Error log:
      
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'
      Are you willing to submit PR?
      •  Yes I am willing to submit a PR!
      Code of Conduct
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
XCom_pull of multiple task_ids not returning the list values · Issue #41983 · apache/airflow · GitHub
          Skip to content
          XCom_pull of multiple task_ids not returning the list values #41983
          Closed as not planned
          Closed as not planned
          XCom_pull of multiple task_ids not returning the list values#41983
          Labels
          Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
          Description
          @edulauer
          edulauer
          opened on Sep 3, 2024
          Apache Airflow version
          2.10.0
          If "Other Airflow 2 version" selected, which one?
          No response
          What happened?
          When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
          
In older versions of Airflow, such as 2.9.3, this issue did not occur.
          What you think should happen instead?
          It should return a list of values pushed by each task mentioned in the task_ids argument
          How to reproduce
          with DAG as dag:
          push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

          Operating System
          Debian GNU/Linux 12
          Versions of Apache Airflow Providers
          No response
          Deployment
          Docker-Compose
          Deployment details
          FROM apache/airflow:2.10.0-python3.10
          Anything else?
          In older versions of Airflow, such as 2.9.3, this issue did not occur.
          Error log:
          
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'
          Are you willing to submit PR?
          •  Yes I am willing to submit a PR!
          Code of Conduct
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
XCom_pull of multiple task_ids not returning the list values · Issue #41983 · apache/airflow · GitHub
              Skip to content
              XCom_pull of multiple task_ids not returning the list values #41983
              Closed as not planned
              Closed as not planned
              XCom_pull of multiple task_ids not returning the list values#41983
              Labels
              Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
              Description
              @edulauer
              edulauer
              opened on Sep 3, 2024
              Apache Airflow version
              2.10.0
              If "Other Airflow 2 version" selected, which one?
              No response
              What happened?
              When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
              
In older versions of Airflow, such as 2.9.3, this issue did not occur.
              What you think should happen instead?
              It should return a list of values pushed by each task mentioned in the task_ids argument
              How to reproduce
              with DAG as dag:
              push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

              Operating System
              Debian GNU/Linux 12
              Versions of Apache Airflow Providers
              No response
              Deployment
              Docker-Compose
              Deployment details
              FROM apache/airflow:2.10.0-python3.10
              Anything else?
              In older versions of Airflow, such as 2.9.3, this issue did not occur.
              Error log:
              
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'
              Are you willing to submit PR?
              •  Yes I am willing to submit a PR!
              Code of Conduct
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
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var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
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try {
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try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
XCom_pull of multiple task_ids not returning the list values · Issue #41983 · apache/airflow · GitHub
                  Skip to content
                  XCom_pull of multiple task_ids not returning the list values #41983
                  Closed as not planned
                  Closed as not planned
                  XCom_pull of multiple task_ids not returning the list values#41983
                  Labels
                  Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
                  Description
                  @edulauer
                  edulauer
                  opened on Sep 3, 2024
                  Apache Airflow version
                  2.10.0
                  If "Other Airflow 2 version" selected, which one?
                  No response
                  What happened?
                  When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
                  
In older versions of Airflow, such as 2.9.3, this issue did not occur.
                  What you think should happen instead?
                  It should return a list of values pushed by each task mentioned in the task_ids argument
                  How to reproduce
                  with DAG as dag:
                  push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

                  Operating System
                  Debian GNU/Linux 12
                  Versions of Apache Airflow Providers
                  No response
                  Deployment
                  Docker-Compose
                  Deployment details
                  FROM apache/airflow:2.10.0-python3.10
                  Anything else?
                  In older versions of Airflow, such as 2.9.3, this issue did not occur.
                  Error log:
                  
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'
                  Are you willing to submit PR?
                  •  Yes I am willing to submit a PR!
                  Code of Conduct
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
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setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
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}, 1000);
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observer.observe(document.body, { childList: true, subtree: true });
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
XCom_pull of multiple task_ids not returning the list values · Issue #41983 · apache/airflow · GitHub
                      Skip to content
                      XCom_pull of multiple task_ids not returning the list values #41983
                      Closed as not planned
                      Closed as not planned
                      XCom_pull of multiple task_ids not returning the list values#41983
                      Labels
                      Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
                      Description
                      @edulauer
                      edulauer
                      opened on Sep 3, 2024
                      Apache Airflow version
                      2.10.0
                      If "Other Airflow 2 version" selected, which one?
                      No response
                      What happened?
                      When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
                      
In older versions of Airflow, such as 2.9.3, this issue did not occur.
                      What you think should happen instead?
                      It should return a list of values pushed by each task mentioned in the task_ids argument
                      How to reproduce
                      with DAG as dag:
                      push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

                      Operating System
                      Debian GNU/Linux 12
                      Versions of Apache Airflow Providers
                      No response
                      Deployment
                      Docker-Compose
                      Deployment details
                      FROM apache/airflow:2.10.0-python3.10
                      Anything else?
                      In older versions of Airflow, such as 2.9.3, this issue did not occur.
                      Error log:
                      
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'
                      Are you willing to submit PR?
                      •  Yes I am willing to submit a PR!
                      Code of Conduct
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
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observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
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} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
XCom_pull of multiple task_ids not returning the list values · Issue #41983 · apache/airflow · GitHub
                          Skip to content
                          XCom_pull of multiple task_ids not returning the list values #41983
                          Closed as not planned
                          Closed as not planned
                          XCom_pull of multiple task_ids not returning the list values#41983
                          Labels
                          Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
                          Description
                          @edulauer
                          edulauer
                          opened on Sep 3, 2024
                          Apache Airflow version
                          2.10.0
                          If "Other Airflow 2 version" selected, which one?
                          No response
                          What happened?
                          When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
                          
In older versions of Airflow, such as 2.9.3, this issue did not occur.
                          What you think should happen instead?
                          It should return a list of values pushed by each task mentioned in the task_ids argument
                          How to reproduce
                          with DAG as dag:
                          push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

                          Operating System
                          Debian GNU/Linux 12
                          Versions of Apache Airflow Providers
                          No response
                          Deployment
                          Docker-Compose
                          Deployment details
                          FROM apache/airflow:2.10.0-python3.10
                          Anything else?
                          In older versions of Airflow, such as 2.9.3, this issue did not occur.
                          Error log:
                          
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'
                          Are you willing to submit PR?
                          •  Yes I am willing to submit a PR!
                          Code of Conduct
                          Metadata
                          Metadata
                          Assignees
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
XCom_pull of multiple task_ids not returning the list values · Issue #41983 · apache/airflow · GitHub
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                              XCom_pull of multiple task_ids not returning the list values #41983
                              Closed as not planned
                              Closed as not planned
                              XCom_pull of multiple task_ids not returning the list values#41983
                              Labels
                              Stale Bug Reportarea:corekind:bugThis is a clearly a bugneeds-triagelabel for new issues that we didn't triage yet
                              Description
                              @edulauer
                              edulauer
                              opened on Sep 3, 2024
                              Apache Airflow version
                              2.10.0
                              If "Other Airflow 2 version" selected, which one?
                              No response
                              What happened?
                              When passing a list of task IDs to the task_ids argument in task_instance.xcom_pull, instead of receiving a list of values returned by each task, you might encounter a string with the value 'LazySelectSequence'."
                              
In older versions of Airflow, such as 2.9.3, this issue did not occur.
                              What you think should happen instead?
                              It should return a list of values pushed by each task mentioned in the task_ids argument
                              How to reproduce
                              with DAG as dag:
                              push_task = PythonOperator(
task_id='push_task',
python_callable=lambda: 'Hello, World!')
push_task_2 = PythonOperator(
task_id='push_task_2',
python_callable=lambda: 'Hello, World 2!')
def pull_function(**kwargs):
ti = kwargs['ti']
msg = ti.xcom_pull(task_ids=['push_task', 'push_task_2'])
print("received message: '%s'" % msg)
pull_task = PythonOperator(
task_id='pull_task',
python_callable=pull_function,
provide_context=True,
)

                              Operating System
                              Debian GNU/Linux 12
                              Versions of Apache Airflow Providers
                              No response
                              Deployment
                              Docker-Compose
                              Deployment details
                              FROM apache/airflow:2.10.0-python3.10
                              Anything else?
                              In older versions of Airflow, such as 2.9.3, this issue did not occur.
                              Error log:
                              
[2024-09-03, 17:48:50 -03] {logging_mixin.py:190} INFO - received message: 'LazySelectSequence([2 items])'
                              Are you willing to submit PR?
                              •  Yes I am willing to submit a PR!
                              Code of Conduct
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