[jira] [Resolved] (HAWQ-1486) PANIC accessing PXF HDFS table

["Oleksandr Diachenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HAWQ-1486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleksandr Diachenko resolved HAWQ-1486.
---------------------------------------
    Resolution: Fixed

Merged to master.

> PANIC accessing PXF HDFS table
> ------------------------------
>
>                 Key: HAWQ-1486
>                 URL: https://issues.apache.org/jira/browse/HAWQ-1486
>             Project: Apache HAWQ
>          Issue Type: Bug
>          Components: External Tables, PXF
>            Reporter: John Gaskin
>            Assignee: Vineet Goel
>             Fix For: 2.3.0.0-incubating
>
>
> This code doesn't catch the case when churl_init_download() returns NULL. This seems to trigger a segfault at libcurl level.
> {code}
> Looks like we failed to connect to PXF (?).
> Piece of code in HAWQ handling cUrl calls (pxfutils.c):
>  100 static void process_request(ClientContext* client_context, char *uri)
>  101 {
>  102     size_t n = 0;
>  103     char buffer[RAW_BUF_SIZE];
>  104
>  105     print_http_headers(client_context->http_headers);
>  106     client_context->handle = churl_init_download(uri, client_context->http_headers);
>  107     memset(buffer, 0, RAW_BUF_SIZE);
>  108     resetStringInfo(&(client_context->the_rest_buf));
>  109
>  110     /*
>  111      * This try-catch ensures that in case of an exception during the "communication with PXF and the accumulation of
>  112      * PXF data in client_context->the_rest_buf", we still get to terminate the libcurl connection nicely and avoid
>  113      * leaving the PXF server connection hung.
>  114      */
>  115     PG_TRY();
>  116     {
>  117         /* read some bytes to make sure the connection is established */
>  118         churl_read_check_connectivity(client_context->handle);
> {code}



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