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HDFS-10772. Reduce byte/string conversions for get listing. Contributed by Daryn Sharp. 

(cherry picked from commit a1f3293762)
This commit is contained in:
Kihwal Lee 2016-08-24 15:25:33 -05:00
parent e31745e281
commit ba3257baf5
1 changed files with 15 additions and 11 deletions
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14
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirStatAndListingOp.java
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@ -23,6 +23,7 @@ import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.fs.DirectoryListingStartAfterNotFoundException;
import org.apache.hadoop.fs.FileEncryptionInfo;
import org.apache.hadoop.fs.InvalidPathException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.fs.QuotaUsage;
@ -50,7 +51,6 @@ import static org.apache.hadoop.util.Time.now;
class FSDirStatAndListingOp {
static DirectoryListing getListingInt(FSDirectory fsd, final String srcArg,
byte[] startAfter, boolean needLocation) throws IOException {
final String startAfterString = DFSUtil.bytes2String(startAfter);
String src = null;
final INodesInPath iip;
@ -63,18 +63,22 @@ class FSDirStatAndListingOp {
iip = fsd.getINodesInPath(src, true);
}
// Get file name when startAfter is an INodePath
// Get file name when startAfter is an INodePath. This is not the
// common case so avoid any unnecessary processing unless required.
if (startAfter.length > 0 && startAfter[0] == Path.SEPARATOR_CHAR) {
final String startAfterString = DFSUtil.bytes2String(startAfter);
if (FSDirectory.isReservedName(startAfterString)) {
try {
String tmp = FSDirectory.resolvePath(startAfterString, fsd);
byte[][] regularPath = INode.getPathComponents(tmp);
startAfter = regularPath[regularPath.length - 1];
byte[][] components = INode.getPathComponents(startAfterString);
components = FSDirectory.resolveComponents(components, fsd);
startAfter = components[components.length - 1];
} catch (IOException e) {
// Possibly the inode is deleted
throw new DirectoryListingStartAfterNotFoundException(
"Can't find startAfter " + startAfterString);
}
}
}
boolean isSuperUser = true;
if (fsd.isPermissionEnabled()) {