Github user ctubbsii commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/253#discussion_r113294170
--- Diff:
server/base/src/main/java/org/apache/accumulo/server/fs/PerTableVolumeChooser.java
---
@@ -18,36 +18,65 @@
import java.util.concurrent.ConcurrentHashMap;
+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}.
*/
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<String,VolumeChooser>
tableSpecificChooser = new ConcurrentHashMap<>();
+ private final ConcurrentHashMap<String,VolumeChooser>
scopeSpecificChooser = new ConcurrentHashMap<>();
+ private final RandomVolumeChooser randomChooser = new
RandomVolumeChooser();
// TODO has to be lazily initialized currently because of the reliance
on HdfsZooInstance. see ACCUMULO-3411
private volatile ServerConfigurationFactory serverConfs;
+ private volatile VolumeChooser fallbackVolumeChooser = null;
@Override
- public String choose(VolumeChooserEnvironment env, String[] options) {
- VolumeChooser chooser = null;
- if (env.hasTableId()) {
- // This local variable is an intentional component of the
single-check idiom.
- ServerConfigurationFactory localConf = serverConfs;
- if (localConf == null) {
- // If we're under contention when first getting here we'll throw
away some initializations.
- localConf = new
ServerConfigurationFactory(HdfsZooInstance.getInstance());
- serverConfs = localConf;
- }
- final TableConfiguration tableConf =
localConf.getTableConfiguration(env.getTableId());
+ public String choose(VolumeChooserEnvironment env, String[] options)
throws AccumuloException {
+ if (log.isTraceEnabled()) {
+ log.trace("PerTableVolumeChooser.choose");
+ }
+ VolumeChooser chooser;
+ if (!env.hasTableId() && !env.hasScope()) {
+ // Should only get here during Initialize. Configurations are not
yet available.
+ return randomChooser.choose(env, options);
+ }
+
+ ServerConfigurationFactory localConf = loadConf();
+ lazilyCreateFallbackChooser();
+ if (env.hasScope()) {
--- End diff --
`env.hasTableId()` and `env.hasScope()` are mutually exclusive right now.
It's possible that could change, but we'd have to think about what that might
mean. Currently, the only scope is "logger" and it has no table associated with
it.
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