Trimming exceptions in IgniteUtils::cast

[Stanislav Lukyanov]

Hi,

IgniteUtils::cast method is used to cast an exception to 
IgniteCheckedException. It is done by trimming the top exceptions in the trace 
until we find IgniteCheckedException, or until we’ve found the last one. As a 
result, IgniteUtils::cast generally can trim the whole stack trace but the root 
exception.

One problem caused by that is https://issues.apache.org/jira/browse/IGNITE-7904.
ComputeTask::result may throw IgniteException which is to be rethrown by the 
ComputeTaskFuture::get, but in fact the IgniteException and all its causes (but 
the root one) are trimmed, and the exception that comes from the 
ComputeTaskFuture::get is different than excepted.

To fix that I want to change the IgniteUtils::cast not to remove any exceptions 
from the stack trace and just wrap all arguments with IgniteCheckException.
Of course, this will affect all places where IgniteUtils::cast is used (mostly 
various futures completion).
Does anyone have concerns about this?

To illustrate, a patch (untested!) for IgniteUtils is below.

Thanks,
Stan

diff --git 
a/modules/core/src/main/java/org/apache/ignite/internal/util/IgniteUtils.java 
b/modules/core/src/main/java/org/apache/ignite/internal/util/IgniteUtils.java
index cbe64cd97af..5e8d9c8f4d9 100755
--- 
a/modules/core/src/main/java/org/apache/ignite/internal/util/IgniteUtils.java
+++ 
b/modules/core/src/main/java/org/apache/ignite/internal/util/IgniteUtils.java
@@ -7256,26 +7256,16 @@ public abstract class IgniteUtils {
     public static IgniteCheckedException cast(Throwable t) {
         assert t != null;
 
-        while (true) {
-            if (t instanceof Error)
-                throw (Error)t;
+        while (t instanceof GridClosureException)
+            t = ((GridClosureException)t).unwrap();
 
-            if (t instanceof GridClosureException) {
-                t = ((GridClosureException)t).unwrap();
+        if (t instanceof Error)
+            throw (Error)t;
 
-                continue;
-            }
-
-            if (t instanceof IgniteCheckedException)
-                return (IgniteCheckedException)t;
-
-            if (!(t instanceof IgniteException) || t.getCause() == null)
-                return new IgniteCheckedException(t);
+        if (t instanceof IgniteCheckedException)
+            return (IgniteCheckedException)t;
 
-            assert t.getCause() != null; // ...and it is IgniteException.
-
-            t = t.getCause();
-        }
+        return new IgniteCheckedException(t);
     }