[p2-dev] Brittle downloads

[Thomas Hallgren <thomas@xxxxxxx>]

I know that there's been some improvements in this area since M7 which 
I'm currently using but I thought I might ask anyway. What kind of 
socket timeouts do we have and do we make any attempt to retry when a 
socket timeout exception is thrown?

I tried installing the org.eclipse.platform feature several times. I 
always ran into a SocketTimeoutException (see stacktrace below). 
Apparently it tries to download the packed file first and then the jar 
file. If neither succeeds, the installation fails. I first tried this on 
my local machine. I almost always failed so I decided to move to 
build.eclipse.org. As it turns out, it fails there too. So what's going 
on here? Does it contact mirrors that fails or what?

I'm explicitly trying to install from 
http://download.eclipse.org/eclipse/updates/3.5milestones/S-3.5M7-I200904302300. 
Here's the stack-trace that I'm getting 7 times out of ten (the bundle 
that failes question vary):

    [java] !MESSAGE Unable to read repository at 
http://download.eclipse.org/eclipse/updates/3.5milestones/S-3.5M7-I200904302300/plugins/org.eclipse.update.ui_3.2.200.v20090213.jar.pack.gz.
    [java] !STACK 0
    [java] java.net.SocketTimeoutException: Read timed out
    [java]     at java.net.SocketInputStream.socketRead0(Native Method)
    [java]     at 
java.net.SocketInputStream.read(SocketInputStream.java:155)
    [java]     at 
java.io.BufferedInputStream.fill(BufferedInputStream.java:229)
    [java]     at 
java.io.BufferedInputStream.read1(BufferedInputStream.java:267)
    [java]     at 
java.io.BufferedInputStream.read(BufferedInputStream.java:324)
    [java]     at 
sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:658)
    [java]     at 
sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:607)
    [java]     at 
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:966)
    [java]     at 
org.eclipse.ecf.provider.filetransfer.retrieve.UrlConnectionRetrieveFileTransfer.getDecompressedStream(UrlConnectionRetrieveFileTransfer.java:441)
    [java]     at 
org.eclipse.ecf.provider.filetransfer.retrieve.UrlConnectionRetrieveFileTransfer.openStreams(UrlConnectionRetrieveFileTransfer.java:285)
    [java]     at 
org.eclipse.ecf.provider.filetransfer.retrieve.AbstractRetrieveFileTransfer.sendRetrieveRequest(AbstractRetrieveFileTransfer.java:804)
    [java]     at 
org.eclipse.ecf.provider.filetransfer.retrieve.AbstractRetrieveFileTransfer.sendRetrieveRequest(AbstractRetrieveFileTransfer.java:502)
    [java]     at 
org.eclipse.ecf.provider.filetransfer.retrieve.MultiProtocolRetrieveAdapter.sendRetrieveRequest(MultiProtocolRetrieveAdapter.java:98)
    [java]     at 
org.eclipse.equinox.internal.p2.repository.FileReader.sendRetrieveRequest(FileReader.java:251)
    [java]     at 
org.eclipse.equinox.internal.p2.repository.FileReader.readInto(FileReader.java:200)
    [java]     at 
org.eclipse.equinox.internal.p2.repository.RepositoryTransport.download(RepositoryTransport.java:69)
    [java]     at 
org.eclipse.equinox.internal.p2.repository.RepositoryTransport.download(RepositoryTransport.java:113)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.downloadArtifact(SimpleArtifactRepository.java:472)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.downloadArtifact(SimpleArtifactRepository.java:455)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifact(SimpleArtifactRepository.java:522)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.MirrorRequest.getArtifact(MirrorRequest.java:200)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.MirrorRequest.transferSingle(MirrorRequest.java:175)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.MirrorRequest.transfer(MirrorRequest.java:159)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.MirrorRequest.perform(MirrorRequest.java:95)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.simple.SimpleArtifactRepository.getArtifact(SimpleArtifactRepository.java:511)
    [java]     at 
org.eclipse.equinox.internal.p2.artifact.repository.simple.DownloadJob.run(DownloadJob.java:64)

- thomas