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Dear Dennis, I am interested in doing this enhancement but , after going trough the below url's : Netcdf java supports HTTP : http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/reference/httpservices.html http://www.unidata.ucar.edu/software/thredds/current/netcdf-java/reference/ I understand that there is a httpclient communication happening in the netcdf JAR. Could you please shower your thought . Regards, Sashi On Thu, Jul 7, 2016 at 11:11 PM, Dennis Heimbigner <dmh@xxxxxxxx> wrote: > After some research, it appears that the hdfs uses > its own tcp stack and does not use APache httpclient. > So, it cannot be directly used with netcdf-java. > I think the proper approach is use our Amazon S3 code > as a template to build hdfs access. If you are interested > in doing this, we would welcome the effort. > =Dennis Heimbigner > Unidata > > On 7/5/2016 10:51 AM, Sean Arms wrote: > > Greetings Shashi! > > > > netCDF-Java uses a wrapper around the apache http client library, > > called httpservices. > > While httpservices knows about the apache http client, it does not know > > about the hadoop http client, which is the cause of the error you are > > seeing. > > > > Dennis - do you know what it would take to support http access to hadoop > ( > > hdfs) via httpservices? > > > > Sean > > > > > > On Sat, Jul 2, 2016 at 1:37 AM, shashi kumar <shashi.fengshui@xxxxxxxxx> > > wrote: > > > >> Dear Sean, > >> > >> I am getting the below error when i use the netcdf-all jar on my hadoop > >> project for analysing the nc file . Kindly help me in identifying the > issue > >> . > >> > >> ucar.httpservices.HTTPException: ucar.httpservices.HTTPException: > org.apache.http.conn.UnsupportedSchemeException: hdfs protocol is not > supported > >> at ucar.httpservices.HTTPMethod.execute(HTTPMethod.java:335) > >> at > ucar.nc2.dataset.NetcdfDataset.checkIfDods(NetcdfDataset.java:864) > >> at > ucar.nc2.dataset.NetcdfDataset.disambiguateHttp(NetcdfDataset.java:820) > >> at > ucar.nc2.dataset.NetcdfDataset.openOrAcquireFile(NetcdfDataset.java:706) > >> at > ucar.nc2.dataset.NetcdfDataset.openDataset(NetcdfDataset.java:427) > >> at > ucar.nc2.dataset.NetcdfDataset.acquireDataset(NetcdfDataset.java:528) > >> at ucar.nc2.dt.grid.GridDataset.open(GridDataset.java:117) > >> at ucar.nc2.dt.grid.GridDataset.open(GridDataset.java:103) > >> at > tvl.bd.climate.recordreader.MyRecordReader.initialize(MyRecordReader.java:46) > >> at > org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:521) > >> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763) > >> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364) > >> at org.apache.hadoop.mapred.Child$4.run(Child.java:255) > >> at java.security.AccessController.doPrivileged(Native Method) > >> at javax.security.auth.Subject.doAs(Subject.java:422) > >> at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190) > >> at org.apache.hadoop.mapred.Child.main(Child.java:249) > >> Caused by: ucar.httpservices.HTTPException: > org.apache.http.conn.UnsupportedSchemeException: hdfs protocol is not > supported > >> at ucar.httpservices.HTTPSession.execute(HTTPSession.java:1136) > >> at ucar.httpservices.HTTPMethod.execute(HTTPMethod.java:326) > >> ... 16 more > >> Caused by: org.apache.http.conn.UnsupportedSchemeException: hdfs > protocol is not supported > >> at > org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:108) > >> at > org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353) > >> at > org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380) > >> at > org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) > >> at > org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) > >> at > org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) > >> at > org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) > >> at > org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) > >> at > org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:71) > >> at ucar.httpservices.HTTPSession.execute(HTTPSession.java:1134) > >> > >> > >> Regards, > >> > >> Sashi > >> > >> > > >
netcdf-java
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