ABORTED - Aborted: Concurrency Conflict

#Common Causes

• →Concurrent Modification: Another operation modifies the resource between your read and write operations. GCP detects the conflict and aborts your operation. This is transient—retrying with fresh state helps.
• →Transaction Conflict: Multiple transactions try to modify the same resource simultaneously. GCP aborts conflicting transactions. This is transient—retrying the transaction may succeed.
• →Optimistic Locking Failure: The resource state changed since you last read it. GCP validates state consistency and aborts operations with stale state. This is transient—reading fresh state and retrying helps.
• →Service-Specific Concurrency: Concurrency behavior varies by service. Some services have stronger concurrency guarantees than others.

✓Solutions

1. 1Step 1: Diagnose - Check for concurrent operations that might be conflicting: gcloud compute operations list --filter="status:RUNNING" --project PROJECT_ID
2. 2Step 2: Diagnose - Read current resource state before modifying to ensure you have fresh state: gcloud compute instances describe INSTANCE_NAME --zone ZONE --project PROJECT_ID
3. 3Step 3: Diagnose - Check operation logs for concurrent modifications: gcloud compute operations list --filter="targetLink:*instances/INSTANCE_NAME" --project PROJECT_ID
4. 4Step 4: Fix - Retry the operation after getting fresh resource state. Read the current resource state, then retry your modification.
5. 5Step 5: Fix - Implement retry logic that handles ABORTED errors with exponential backoff. Use exponential backoff between retries to reduce conflict probability.
6. 6Step 6: Verify - Retry the operation with fresh state and exponential backoff. If it succeeds, the conflict was resolved.

</>Code Examples

1# This script demonstrates retry logic with fresh state for ABORTED errors
2
3PROJECT_ID="my-project"
4INSTANCE_NAME="my-instance"
5ZONE="us-central1-a"
6MAX_RETRIES=3
7RETRY_DELAY=1
8
9echo "Attempting to update instance with retry logic..."
10
11for i in $(seq 1 $MAX_RETRIES); do
12  echo "Attempt $i of $MAX_RETRIES..."
13  
14  # Step 1: Get fresh state before modifying
15  echo "Reading current resource state..."
16  CURRENT_STATE=$(gcloud compute instances describe $INSTANCE_NAME \
17    --zone $ZONE \
18    --project $PROJECT_ID \
19    --format="get(metadata.items[key=my-key].value)" 2>/dev/null)
20  
21  echo "Current state: $CURRENT_STATE"
22  
23  # Step 2: Attempt the update operation
24  if gcloud compute instances update $INSTANCE_NAME \
25    --zone $ZONE \
26    --project $PROJECT_ID \
27    --metadata my-key=new-value 2>&1; then
28    echo "Update successful on attempt $i"
29    exit 0
30  else
31    ERROR_CODE=$?
32    
33    # Step 3: Check if we have retries remaining
34    if [ $i -lt $MAX_RETRIES ]; then
35      echo "Operation aborted. Waiting $RETRY_DELAY seconds before retry..."
36      sleep $RETRY_DELAY
37      RETRY_DELAY=$((RETRY_DELAY * 2))  # Exponential backoff
38    else
39      echo "Failed after $MAX_RETRIES attempts"
40      echo "Consider:"
41      echo "  1. Check for concurrent operations: gcloud compute operations list --filter='status:RUNNING'"
42      echo "  2. Serialize operations or reduce concurrency"
43      exit 1
44    fi
45  fi
46done

↗Related Errors