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HDFS-6690. Deduplicate xattr names in memory. (wang) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1611226 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Andrew Wang 2014-07-17 00:44:16 +00:00
parent bda23181bf
commit ca52cb01c4
2 changed files with 36 additions and 6 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
View File

@ -294,6 +294,8 @@ Release 2.6.0 - UNRELEASED
OPTIMIZATIONS
HDFS-6690. Deduplicate xattr names in memory. (wang)
BUG FIXES
HDFS-6617. Flake TestDFSZKFailoverController.testManualFailoverWithDFSHAAdmin

40
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/XAttrStorage.java
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@ -19,24 +19,30 @@
package org.apache.hadoop.hdfs.server.namenode;
import java.util.List;
import java.util.Map;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.XAttr;
import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
import org.apache.hadoop.hdfs.server.namenode.INode;
import com.google.common.collect.ImmutableList;
/**
* XAttrStorage is used to read and set xattrs for an inode.
*/
@InterfaceAudience.Private
public class XAttrStorage {
private static final Map<String, String> internedNames = Maps.newHashMap();
/**
* Reads the existing extended attributes of an inode. If the
* inode does not have an <code>XAttr</code>, then this method
* returns an empty list.
* <p/>
* Must be called while holding the FSDirectory read lock.
*
* @param inode INode to read
* @param snapshotId
* @return List<XAttr> <code>XAttr</code> list.
@ -48,6 +54,9 @@ public class XAttrStorage {
/**
* Reads the existing extended attributes of an inode.
* <p/>
* Must be called while holding the FSDirectory read lock.
*
* @param inode INode to read.
* @return List<XAttr> <code>XAttr</code> list.
*/
@ -58,6 +67,9 @@ public class XAttrStorage {
/**
* Update xattrs of inode.
* <p/>
* Must be called while holding the FSDirectory write lock.
*
* @param inode INode to update
* @param xAttrs to update xAttrs.
* @param snapshotId id of the latest snapshot of the inode
@ -70,8 +82,24 @@ public class XAttrStorage {
}
return;
}
ImmutableList<XAttr> newXAttrs = ImmutableList.copyOf(xAttrs);
// Dedupe the xAttr name and save them into a new interned list
List<XAttr> internedXAttrs = Lists.newArrayListWithCapacity(xAttrs.size());
for (XAttr xAttr : xAttrs) {
final String name = xAttr.getName();
String internedName = internedNames.get(name);
if (internedName == null) {
internedName = name;
internedNames.put(internedName, internedName);
}
XAttr internedXAttr = new XAttr.Builder()
.setName(internedName)
.setNameSpace(xAttr.getNameSpace())
.setValue(xAttr.getValue())
.build();
internedXAttrs.add(internedXAttr);
}
// Save the list of interned xattrs
ImmutableList<XAttr> newXAttrs = ImmutableList.copyOf(internedXAttrs);
if (inode.getXAttrFeature() != null) {
inode.removeXAttrFeature(snapshotId);
}