Jerry Cwiklik created UIMA-5933:
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Summary: UIMA-DUCC: improve pull service http client error
handling
Key: UIMA-5933
URL: https://issues.apache.org/jira/browse/UIMA-5933
Project: UIMA
Issue Type: Bug
Components: DUCC
Affects Versions: 2.2.2-Ducc
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 2.2.3-Ducc
The pull service error handling in HttpServiceTransport.dispatch() is not
optimal. While it is catching and handling some exceptions like
NoHttpResponseException
HttpHostConnectException
UnknownHostException
its not handling other ones that HttpClient.execute() may throw.
Simplify handling of exceptions from HttpClient.execute() by simply catching
any IOException and automatically retry until success. The HttpClient.execute()
API is documented as:
HttpResponse org.apache.http.client.HttpClient.execute(HttpUriRequest request)
throws IOException, ClientProtocolException
Note: the ClientProtocolException is a kind of (extends from) IOException
Also, the http client may succeed but returns status code != 200. In such case,
we should also retry.
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