IBM Spectrum Symphony是基于SOA架构的分布式计算框架，它能在自由伸缩的共享集群中，为计算密集型和数据密集型的应用提供强大的企业级管理。
Symphony有一个配置是这样的，在应用的profile里头，有个方法是Register，可以配置成actionOnSI="blockHost"。这样当某service实例在Register方法中由于某种原因(比方说磁盘不足、单点故障等)而失败的话，计算节点就会被阻止加入到计算，那么Symphony会从资源组里分配其他可用的计算节点参与运算。这样做的目的是避免作业一直分配到某个不能成功完成运算的节点，导致时间浪费甚至作业得不到计算。
<Method name="Register">
<Timeout actionOnSI="blockHost" duration="600"/>
<Exit actionOnSI="blockHost"/>
</Method>
某天，客户遇到这样一个问题。他们更新了应用的service代码，要部署到cluster。部署是成功的，但是在解压缩的时候，出错了，结果就是节点被blocked。为了方便理解，先贴上Symphony SOAM这部分的架构图。红框部分是Symphony中间件，客户仅需要开发客户端client和服务端service，client用于提交作业，service实例用于计算作业，至于资源调度和作业调度则由中间件完成，客户不需要考虑。
所以我们需要看SIM(图中的Service Instance Manager)的日志，因为是SIM管理着SI(图中的Service Instance)，包括SI的启动、更新、退出等。下面是SIM的日志
15:51:06.951 GMT DEBUG [5268:17244] CLI.dpl.download.Uncompress - Uncompress::copyArchive: Copying file C:\Windows\TEMP\\SI_Package_Name_Version\SI_Package_Name_Version.zip to D:\grid\ibm/soam\deploy\SI_Package_Name_Version.v1\SI_Package_Name_Version.zip
15:51:06.966 GMT DEBUG [5268:17244] CLI.dpl.download.Uncompress - Uncompress::execNextStep: Executing uncompress or validate step: D:\grid\ibm\soam\7.2\w2k3_x64-vc7-psdk\bin\..\bin\utils\unzip -o -q "SI_Package_Name_Version.zip"
15:51:06.966 GMT DEBUG [5268:17244] CLI.dpl.download.Uncompress - Uncompress::execCmd: Execute PATH: D:\grid\ibm/soam/7.2/w2k3_x64-vc7-psdk/lib64;D:\grid\ibm/soam/7.2/w2k3_x64-vc7-psdk/bin;D:\grid\ibm/soam/7.2/w2k3_x64-vc7-psdk/lib;D:\grid\ibm\3.6\lib;D:\grid\ibm\soam\7.2\w2k3_x64-vc7-psdk\bin;D:\grid\ibm\soam\7.2\w2k3_x64-vc7-psdk\lib;D:\grid\ibm\soam\7.2\w2k3_x64-vc7-psdk\lib64;D:\grid\ibm\3.6\bin;D:\grid\ibm\3.6\lib;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\\Hewlett-Packard\HPSUT\bin;C:\Program Files\HP\HP BTO Software\lib;C:\Program Files\HP\HP BTO Software\bin;C:\Program Files\HP\HP BTO Software\bin\win64;C:\Program Files\HP\HP BTO Software\bin\win64\OpC;;D:\grid\ibm\3.6\lib;D:\grid\ibm\3.6\bin
15:51:06.966 GMT DEBUG [5268:17244] CLI.dpl.download.RunTask - RunTask::execBlock(): Started: D:\grid\ibm\soam\7.2\w2k3_x64-vc7-psdk\bin\..\bin\utils\unzip -o -q "SI_Package_Name_Version.zip" with tid 388881
15:51:07.869 GMT DEBUG [5268:17244] CLI.dpl.download.RunTask - RunTask::execBlock(): There may be some exceptions or errors during decompressing process, and the status of the process is 1
15:51:07.869 GMT DEBUG [5268:17244] CLI.dpl.download.Uncompress - Uncompress::execNextStep: Decompress or validate command failed.
15:51:07.869 GMT INFO [5268:17244] CLI.dpl.deployutils - warning: SI_Package_Name_Version.zip appears to use backslashes as path separators
15:51:07.869 GMT DEBUG [5268:17244] CLI.dpl.download.Uncompress - Uncompress::extract: Deleting file D:\grid\ibm/soam\deploy\SI_Package_Name_Version.v1\SI_Package_Name_Version.zip
15:51:07.869 GMT DEBUG [5268:17244] CLI.dpl.download.InstallModule - InstallModule::copyModuleAndDecompress(): Failed to uncompress: C:\Windows\TEMP\\SI_Package_Name_Version\SI_Package_Name_Version.zip
15:51:07.869 GMT ERROR [5268:17244] CLI.dpl.download.InstallModule - Domain <Application>: Failed to uncompress the package, C:\Windows\TEMP\\SI_Package_Name_Version\SI_Package_Name_Version.zip. Check if the de-archive utility is available or there is enough disk storage for uncompressing.
15:51:07.916 GMT DEBUG [5268:17244] CLI.SoamDeploy.CliSoamDeployDownloadImpl - Deleting tmp file: C:\Windows\TEMP\\SI_Package_Name_Version\SI_Package_Name_Version.zip
15:51:07.916 GMT ERROR [5268:17244] CLI.SoamDeploy.CliSoamDeployDownloadImpl - Domain <Application>: The package <SI_Package_Name_Version> failed to install. The deployed package file could not be decompressed. Check if: (1) the decompression utility is available, (2) there is enough disk storage for decompressing the file, or (3) the package file is too large to be decompressed.
从SIM日志来看，新的SI的package是已经下载到本地了，但是在解压缩的时候，报了个warning级别的消息："SI_Package_Name_Version.zip appears to use backslashes as path separators"，解压缩的命令是unzip -o -q "SI_Package_Name_Version.zip"。根据后边的日志，可能的原因包括：
(1) unzip工具不存在；
(2) 磁盘空间不足；
(3) 包太大。
当然，客户检查下来，这三个怀疑点都不是问题。
那会不会是压缩包本身有问题呢？于是让客户在同一台计算节点上，手动去解压缩那个包。果然，手动解压缩也有类似的warning，只不过虽然报了这个warning，解压缩是成功的，所有文件和目录都解压出来了。
D:\grid\ibm\soam\deploy\Applications\SampleAppJava\SI_Package_Name_Version.v1
>D:\grid\ibm\soam\7.2\w2k3_x64-vc7-psdk\bin\..\bin\utils\unzip -o -q SI_Package_Name_Version.zip
warning: SI_Package_Name_Version.zip appears to use backslashes as path separators
至此，可以断定跟Symphony关系不大，要么是压缩包有问题，要么是unzip不能解压缩这个压缩包。
通过询问客户得知，客户的压缩文件都是经过Windows的Powershell压缩工具Compress-Archive生成的。于是模仿客户的包的格式，在实验室里可以复现相同问题。原来问题在于，使用Compress-Archive压缩带有文件夹的内容时，压缩没有问题；但用unzip去解压缩时，就会遇到“use backslashes as path separators”问题。进一步测试发现，在Windows中如果通过右击内容，选择"Compress(zipped) folder"的方式，或者通过7-zip来压缩的方式，unzip都可以完美解压。
PS C:\Users\Administrator> Compress-Archive
cmdlet Compress-Archive at command pipeline position 1
Supply values for the following parameters:
Path[0]: C:\Users\Administrator\file1.log
Path[1]: C:\Users\Administrator\lab\
Path[2]:
DestinationPath: C:\Users\Administrator\package.zip
PS C:\Users\Administrator> C:\symphony\soam\7.3\w2k3_x64-vc7-psdk\bin\utils\unzip.exe -o -q .\package.zip
warning: ./package.zip appears to use backslashes as path separators
PS C:\Users\Administrator> C:\symphony\soam\7.3\w2k3_x64-vc7-psdk\bin\utils\unzip.exe -o -q .\package.zip
warning: ./package.zip appears to use backslashes as path separators
PS C:\Users\Administrator> Compress-Archive
所以，严格地说，这不是Symphony的问题，是Windows的Compress-Archive工具的问题。一顿Google，果然找到Powershell报告这是一个Microsoft.PowerShell.Archive的bug，在版本1.2.3.0得到修复，详情请参考https://github.com/PowerShell/Microsoft.PowerShell.Archive/issues/48
由于客户坚持要用Microsoft.PowerShell.Archive去压缩，所以解决方法只能是升级Microsoft.PowerShell.Archive，方法请参考https://www.powershellgallery.com/packages/Microsoft.PowerShell.Archive/1.2.3.0
下面是我在实验室里升级Microsoft.PowerShell.Archive和验证问题得到解决的操作：
PS C:\Users\egoadmin> Install-Module -Name Microsoft.PowerShell.Archive -RequiredVersion 1.2.3.0
NuGet provider is required to continue
PowerShellGet requires NuGet provider version '2.8.5.201' or newer to interact with NuGet-based repositories. The NuGet
provider must be available in 'C:\Program Files\PackageManagement\ProviderAssemblies' or
'C:\Users\egoadmin\AppData\Local\PackageManagement\ProviderAssemblies'. You can also install the NuGet provider by
running 'Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force'. Do you want PowerShellGet to install
and import the NuGet provider now?
[Y] Yes [N] No [S] Suspend [?] Help (default is "Y"): y
Untrusted repository
You are installing the modules from an untrusted repository. If you trust this repository, change its
InstallationPolicy value by running the Set-PSRepository cmdlet. Are you sure you want to install the modules from
'PSGallery'?
[Y] Yes [A] Yes to All [N] No [L] No to All [S] Suspend [?] Help (default is "N"): A
PS C:\Users\egoadmin>
PS C:\Users\egoadmin>
PS C:\Users\egoadmin> Get-Module -ListAvailable -Name Microsoft.PowerShell.Archive
Directory: C:\Program Files\WindowsPowerShell\Modules
ModuleType Version Name ExportedCommands
---------- ------- ---- ----------------
Manifest 1.2.3.0 Microsoft.PowerShell.Archive {Compress-Archive, Expand-Archive}
Directory: C:\windows\system32\WindowsPowerShell\v1.0\Modules
ModuleType Version Name ExportedCommands
---------- ------- ---- ----------------
Manifest 1.0.1.0 Microsoft.PowerShell.Archive {Compress-Archive, Expand-Archive}
PS C:\Users\egoadmin\Downloads> dir
Directory: C:\Users\egoadmin\Downloads
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 6/1/2020 7:53 AM lab
d----- 6/1/2020 7:42 AM unzip552
-a---- 6/1/2020 7:53 AM 38 1234.txt
-a---- 6/1/2020 7:38 AM 1295576 ChromeSetup.exe
-a---- 6/1/2020 7:40 AM 1305781 unzip552.zip
PS C:\Users\egoadmin\Downloads> Compress-Archive
cmdlet Compress-Archive at command pipeline position 1
Supply values for the following parameters:
Path[0]: lab
Path[1]: 1234.txt
Path[2]:
DestinationPath: 1.zip
PS C:\Users\egoadmin\Downloads> dir
Directory: C:\Users\egoadmin\Downloads
Mode LastWriteTime Length Name
---- ------------- ------ ----
d----- 6/1/2020 7:53 AM lab
d----- 6/1/2020 7:42 AM unzip552
-a---- 6/1/2020 8:03 AM 290 1.zip
-a---- 6/1/2020 7:53 AM 38 1234.txt
-a---- 6/1/2020 7:38 AM 1295576 ChromeSetup.exe
-a---- 6/1/2020 7:40 AM 1305781 unzip552.zip
C:\Users\Administrator\Downloads>E:\SpectrumComputing\soam\7.2\w2k3_x64-vc7-psdk\bin\utils\unzip.exe -o -q 1.zip
C:\Users\Administrator\Downloads>dir
Volume in drive C has no label.
Volume Serial Number is 74B6-4C2C
Directory of C:\Users\Administrator\Downloads
06/01/2020 12:54 AM <DIR> .
06/01/2020 12:54 AM <DIR> ..
06/01/2020 01:06 AM 290 1.zip
06/01/2020 07:53 AM 38 1234.txt
06/01/2020 12:54 AM <DIR> lab
2 File(s) 328 bytes
3 Dir(s) 4,173,824 bytes free