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From Andrew Gaul <g...@apache.org>
Subject Re: put operation is not repeatable
Date Fri, 25 Nov 2016 20:49:20 GMT
Object stores sometimes have transient failures due to network issues or
node unavailability.  Your used an InputStream payload in
http://pastebin.com/GKr1CaSQ which is not replayable because it can only
produce data, not reset to the beginning of the stream.  Instead you
should consider a ByteSource payload which you can create via
ByteSource.wrap(byte[]) or Files.asByteSource(File).  jclouds will
automatically retry with ByteSource payload; otherwise your application
needs to implement retry logic for InputStream payload.

On Wed, Nov 23, 2016 at 12:08:57PM +0100, Aleksandra Nowak wrote:
> Hi,
> I use jclouds to communicate with Openstack Swift (authentication is
> provided by Keystone).
> Every once in a while I get this exception:
> Cannot retry after server error, command is not replayable:
> [method=org.jclouds.openstack.swift.SwiftKeystoneClient.public
> abstract java.lang.String org.jclouds.openstack.swift.CommonSwiftClient.putObject(java.lang.String,org.jclouds.openstack.swift.domain.SwiftObject)...
> Server rejected operation connecting to PUT http://swift... (full
> exception here: http://pastebin.com/WVtc0U3f)
> Here is the code which I run to upload objects: http://pastebin.com/GKr1CaSQ
> After the error the application can be "fixed" by a restart or by
> executing a GET request to an existing object. I figured that this
> happens because the key from Keystone expires before the PUT command
> is executed. And while GET method is requesting a new key from
> Keystone, PUT is not. And I confirmed it using ngrep on Keystone
> port. During PUT there is no communication to Keystone, but during
> GET I can see that it requested key renewal:
> http://pastebin.com/Wi2xzWZ9
> I turned on jclouds logging on TRACE level. Here is the log when I
> try PUT method: http://pastebin.com/RxRBTXDH and here is log for GET
> first: http://pastebin.com/WhvG4Wy9
> So, it looks like PUT method is not repeatable/replayable for
> InputStream. Can somebody tell me why? Or point to a point in
> documentation where it is described?
> Is there a why to upload InputStream to Swift in a repeatable way?
> My could is wrapped by a REST call which uses Multipart, so I really
> would like to use InputStream. Or is it any other way to renew the
> key?
> Thanks in advance!
> Kind regards,
> Aleksandra

Andrew Gaul

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