/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.hooks;
import org.apache.hadoop.hive.common.io.CachingPrintStream;
import org.apache.hadoop.hive.ql.hooks.HookContext.HookType;
import org.apache.hadoop.hive.ql.session.SessionState;
// If this is run as a pre or post execution hook, it writes a message to SessionState.err
// (causing it to be cached if a CachingPrintStream is being used). If it is run as a failure
// hook, it will write what has been cached by the CachingPrintStream to SessionState.out for
// verification.
public class VerifyCachingPrintStreamHook implements ExecuteWithHookContext {
public void run(HookContext hookContext) {
SessionState ss = SessionState.get();
assert(ss.err instanceof CachingPrintStream);
if (hookContext.getHookType() == HookType.ON_FAILURE_HOOK) {
assert(ss.err instanceof CachingPrintStream);
ss.out.println("Begin cached logs.");
for (String output : ((CachingPrintStream)ss.err).getOutput()) {
ss.out.println(output);
}
ss.out.println("End cached logs.");
} else {
ss.err.println("TEST, this should only appear once in the log.");
}
}
}