PowerShell - Start-Job - Synchronised Array list

Question

Hi all,
I am trying to write a script using start-job against a list of machines. The script is to query a target machine event log using get-winevent cmdlet. I supply the whole code that queries the eventlog in a scriptblock. In order to capture the output (one
psobject for each of the scriptblock jobs) I am trying to use a synchronised arraylist. I do not know the full details of how to use the synchronised arraylist but I have put together the below script (by referring to some of the online articles). But the
script does not work as intended. The individual scriptblocks do not seem to be referring to the global arraylist variable while appending the results.
Would any of you be able to shed any light on it?
Please note, the script without the PowerShell Jobs works fine(that is linear execution which is really time-consuming). Also, even with using psJobs, the script works when I try to dump the result of each job into a csv from within the job itself. But I
want to avoid this situation because due to the asynchronous execution there might be contention for the csv by more than one jobs at the same time. Hence I want to use the synchronised array list.
$InputCSV = "$(Split-Path $SCRIPT:MyInvocation.MyCommand.Path -parent)\backupexec.csv"
$OutputCSV = "$(Split-Path $SCRIPT:MyInvocation.MyCommand.Path -parent)\Reports\BackupExec_Output_$(Get-Date -format "ddMMyyyy")_$((Get-Date).DayOfWeek).csv"
$OutputArray = [System.Collections.ArrayList]::Synchronized((New-Object System.Collections.ArrayList))
$counter=1
$jobs=@{};
$jobcounter=0;
Import-CSV $InputCSV | ForEach {
$Comp_Name=$_.ServerName;
$Counter+=1;
$Scriptblock={
Try {
$IsthereAnyResult= @()
$IsthereAnyResult= Get-WinEvent -ComputerName $Using:Comp_Name -ErrorAction SilentlyContinue -FilterHashTable @{LogName='application';ProviderName='Backup Exec';ID=57755; StartTime=(Get-Date).AddDays(-1)}
$props = @{
"Server Name" = ($event.MachineName -split '\.')[0];
"Event ID" = $event.ID;
"Time Logged" = $event.TimeCreated;
"Backup Result" = Switch ($event.ID) { '57755' {"Success - Skipped"}
'34113' {"Failed"}
'34112' {"Success"} };
"Message" = $event.Properties[0].value -replace '\n' -replace '\r';
$OutputArray += New-Object PSObject -Property $props
} #end try get-winevent
Catch { } #end Catch
} #end scriptblock
$jobs[$jobcounter]= Start-job -name $("Job_$jobcounter") -ScriptBlock $Scriptblock
$jobcounter+=1;
While((Get-Job -State 'Running').Count -ge 10) {
Start-Sleep -Milliseconds 10
} # end main foreach
Get-Job | Wait-Job
$OutputArray | Select-Object "Server Name","Event ID","Time Logged","Backup Result","Message" | Export-CSV -force -Path $OutputCSV -NoTypeInformation -Append

Answer 1

How about this?
I use wmi win32_ntlogevent which i prefer ..  Timeservice is just for example ...
Change the scriptblock to your needs and report the result :]
Param ([int]$BatchSize=2)
#list of servers
[array]$source = (get-adcomputer -filter {name -like "server*"}) |select -expandproperty dnshostname
$blok = {
get-wmiobject Win32_NTLogEvent -Filter "(Logfile='System') and (SourceName = 'Microsoft-Windows-Time-Service')" |select -first 10 |select __server,@{n="EventCode";e={switch($_.EventCode){37{"37 - Receiving"}35{"35 - Synchronizing"}129{"129 - NTP Fail"}default{"Other EventCode"}}}},@{n="Date";e={$_.ConvertToDateTime($_.TimeGenerated)}},message
$elapsedTime = [system.diagnostics.stopwatch]::StartNew()
$result = @()
$itemCount = 0
## checking running jobs
if (get-job|? {$_.name -like "Script*"}){
write-host "ERROR: There are pending background jobs in this session:" -back red -fore white
get-job |? {$_.name -like "Script*"} | out-host
write-host "REQUIRED ACTION: Remove the jobs and restart this script" -back black -fore yellow
$yn = read-host "Automatically remove jobs now?"
if ($yn -eq "y"){
get-job|? {$_.name -like "Script*"}|% {remove-job $_}
write-host "jobs have been removed; please restart the script" -back black -fore green
exit
$i = 0
$itemCount = $source.count
Write-Host "Script will run against $itemcount servers!"
## Script start time mark
write-host "Script started at $(get-date -uFormat "%Y/%m/%d %H:%M:%S")".padright(60) -back darkgreen -fore white
write-host " (contains $itemCount unique entries)" -back black -fore green
$activeJobCount = 0
$totalJobCount = 0
write-host "Submitting background jobs..." -back black -fore yellow
for ($i=0; $i -lt $itemCount;$i += $batchSize){
$activeJobCount += 1; $totalJobCount += 1; $HostList = @()
$HostList += $source |select -skip $i -first $batchsize
$j = invoke-command -computername $Hostlist -scriptblock $blok -asjob
$j.name = "Script`:$totalJobCount`:$($i+1)`:$($getHostList.count)"
write-host "+" -back black -fore cyan -nonewline
write-host "`n$totaljobCount jobs submitted, checking for completed jobs..." -back black -fore yellow
while (get-job |? {$_.name -like "Script*"}){
foreach ($j in get-job | ? {$_.name -like "Script*"}){
$temp = @()
if ($j.state -eq "completed"){
$temp = @()
$temp += receive-job $j
$result += $temp
remove-job $j
$ActiveJobCount -= 1
write-host "-" -back black -fore cyan -nonewline
elseif ($j.state -eq "failed"){
$temp = $j.name.split(":")
if ($temp[1] -eq "R"){
$temp = @()
$temp += receive-job $j
$result += $temp
remove-job $j
$ActiveJobCount -= 1
write-host "-" -back black -fore cyan -nonewline
else{
write-host "`nFailure detected in job: $($j.name)" -back black -fore red
$temp = @()
$temp += receive-job $j
$result += $temp
remove-job $j
$ActiveJobCount -= 1
if ($result.count -lt $itemCount){
sleep 3
write-host " "
write-host "Script finished at $(get-date -uFormat "%Y/%m/%d %H:%M:%S")".padright(60) -back darkgreen -fore white
write-host (" Elapsed Time : {0}" -f $($ElapsedTime.Elapsed.ToString())) -back black -fore green
$result |select __server,eventcode,Date,message |ft -auto
write-host " Script completed all requested operations at $(get-date -uFormat "%Y/%m/%d %H:%M:%S")".padright(60) -back darkgreen -fore white
write-host (" Elapsed Time : {0}" -f $($ElapsedTime.Elapsed.ToString())) -back black -fore green