Github user ivakegg commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/253#discussion_r113243125
--- 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 --
Perhaps ignorance on my part, but shouldn't env.hasTableId() be checked
first? Can env.hasTableId() && env.hasScope()?
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