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From ivakegg <...@git.apache.org>
Subject [GitHub] accumulo pull request #253: ACCUMULO-4086 Improve volume chooser fallback
Date Thu, 27 Jul 2017 21:11:32 GMT
Github user ivakegg commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/253#discussion_r129960558
  
    --- Diff: server/base/src/main/java/org/apache/accumulo/server/fs/PerTableVolumeChooser.java
---
    @@ -18,61 +18,146 @@
     
     import java.util.concurrent.ConcurrentHashMap;
     
    -import org.apache.accumulo.core.client.impl.Table;
    +import org.apache.accumulo.core.client.AccumuloException;
    +import org.apache.accumulo.core.conf.AccumuloConfiguration;
     import org.apache.accumulo.core.conf.Property;
     import org.apache.accumulo.server.client.HdfsZooInstance;
     import org.apache.accumulo.server.conf.ServerConfigurationFactory;
     import org.apache.accumulo.server.conf.TableConfiguration;
    +import org.apache.accumulo.start.classloader.vfs.AccumuloVFSClassLoader;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
     
     /**
    - * A {@link VolumeChooser} that delegates to another volume chooser based on the presence
of an experimental table property,
    - * {@link Property#TABLE_VOLUME_CHOOSER}. If it isn't found, defaults back to {@link
RandomVolumeChooser}.
    + * A {@link VolumeChooser} that delegates to another volume chooser based on other properties:
table.custom.volume.chooser for tables, and
    + * general.custom.scoped.volume.chooser for scopes. general.custor.{scope}.volume.chooser
can override the system wide setting for
    + * general.custom.scoped.volume.chooser. At the this this was written, the only known
scope was "logger".
      */
     public class PerTableVolumeChooser implements VolumeChooser {
    -
    -  private final VolumeChooser fallbackVolumeChooser = new RandomVolumeChooser();
    +  private static final Logger log = LoggerFactory.getLogger(PerTableVolumeChooser.class);
       // TODO Add hint of expected size to construction, see ACCUMULO-3410
       /* Track VolumeChooser instances so they can keep state. */
    -  private final ConcurrentHashMap<Table.ID,VolumeChooser> tableSpecificChooser
= new ConcurrentHashMap<>();
    +  private final ConcurrentHashMap<String,VolumeChooser> tableSpecificChooser =
new ConcurrentHashMap<>();
    --- End diff --
    
    You will see that the same routine is used to add volume choosers into those maps, so
I had to use a common denominator for the class.  String works well.  However if you insist
that I use Table.ID here instead, then I will denormalize the common method.


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