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From joshelser <...@git.apache.org>
Subject [GitHub] accumulo pull request: ACCUMULO-4229 BatchWriter Locator cache out...
Date Mon, 25 Apr 2016 13:19:29 GMT
Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/96#discussion_r60910507
  
    --- Diff: test/src/test/java/org/apache/accumulo/test/BatchWriterInTabletServerIT.java
---
    @@ -0,0 +1,120 @@
    +/*
    + * 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.accumulo.test;
    +
    +import com.google.common.collect.Iterators;
    +import org.apache.accumulo.core.client.BatchWriter;
    +import org.apache.accumulo.core.client.BatchWriterConfig;
    +import org.apache.accumulo.core.client.Connector;
    +import org.apache.accumulo.core.client.IteratorSetting;
    +import org.apache.accumulo.core.client.Scanner;
    +import org.apache.accumulo.core.data.Key;
    +import org.apache.accumulo.core.data.Mutation;
    +import org.apache.accumulo.core.data.PartialKey;
    +import org.apache.accumulo.core.data.Value;
    +import org.apache.accumulo.core.iterators.LongCombiner;
    +import org.apache.accumulo.core.iterators.user.SummingCombiner;
    +import org.apache.accumulo.core.security.Authorizations;
    +import org.apache.accumulo.harness.AccumuloClusterIT;
    +import org.apache.hadoop.io.Text;
    +import org.junit.Assert;
    +import org.junit.Test;
    +
    +import java.util.Map;
    +
    +/**
    + * Test writing to another table from inside an iterator.
    + *
    + * @see BatchWriterIterator
    + */
    +public class BatchWriterInTabletServerIT extends AccumuloClusterIT {
    --- End diff --
    
    > I don't think ACCUMULO-3975 applies here, unless someone runs >16 instances of
this test in parallel. There has to be more concurrent scans running than the number of available
tserver readahead threads in order for a deadlock to be possible. This test scans with 1 thread
since it uses a non-Batch Scanner.
    
    Well, that's kind of my point. We don't definitively know what else is going on in a standalone
(real) cluster while this test is being run.
    
    > I'm happy to restrict the test to MINI if it makes you more comfortable. The more
important point is fixing the issue.
    
    Thanks, it would and agreed.


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