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AEM – Thread Dumps Analysis

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-== & ==-

REFERENCE LINKS:

SYNOPSIS:

  • A customized powershell script to download/generate the thread dumps
  • Using fastthread to analyse the dumps
  • Using fastthread API to get the response in JSON format
  • Extracting the thread dump report URL from the JSON and access the report
  • Use the Thread Dump Collection & Analysis tool [jstack] to take thread dumps from a running CQ instance for troubleshooting the following:
    • Performance
    • Lock contention.
    • Dead lock
    • other thread-related issues

ASSUMPTION:

  • Assuming that service name is AEM
  • cURL is already installed and configured on windows
  • Has Administrator access
  • Already have API access to fastthread, if not register at FastThread API

GUIDE:

  • Powershell Script to generate thread dumps, upload to fastthread using cURL or API endpoint, and get JSON response.
  • Following is the report generated on Fast Thread


# stopping the job if it encounters error
$ErrorActionPreference = 'Stop'
$WarningPreference = 'SilentlyContinue'

# Parameters
$AEMSRC = (get-wmiobject win32_service | ?{$_.Name -eq 'AEM'})
$AEMPID = $AEMSRC.ProcessID
$CURLEXE = "C:\tools\curl76\bin\curl.exe"
$FILENAME = "tdaem64.txt"

# Generating ThreadDumps
cmd.exe /c "jstack -l $AEMPID > $FILENAME"
# Fastthread API
$REPURL = "http://api.fastthread.io/fastthread-api?apiKey={xxxx-xxxx-xxxx-xxxxxx-xxxxxxxxxx}"
# ThreadDumps output file
$DATA = "@$FILENAME"
# Generating threaddumps Report in JSON format
$REPDATA = cmd.exe /c "curl -X POST --data-binary @./$FILENAME $REPURL --header Content-Type:text" | ConvertFrom-Json
# Extracting the ThreadDump report URL from JSON output
$REPORTURL = $REPDATA.graphURL

# Email the Report URL
Write-Host "Emailing the ThreadDump Report"
Send-MailMessage -SmtpServer smtp.gmail.com 
-Port 587 
-Credential $cred 
-UseSsl 
-From 'xxxxxx@gmail.com' 
-To 'xxxx.xxxx@email.com' 
-Subject "ThreadDump Report" `
-Body "The ThreadDump Report can be viewed at $REPORTURL"
Write-Host "Email Sent."

# Clean Up
Remove-Item -Path $FILENAME

# Open the ThreadDump Report in Chrome Browser
Start-Process "chrome.exe" $REPORTURL


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Shashi View All

-== Superman ==-

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