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HDFS-2533. Remove needless synchronization on some FSDataSet methods. Contributed by Todd Lipcon. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1196902 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Todd Lipcon 2011-11-03 01:00:25 +00:00
parent f84552ac35
commit 11cf658d0a
2 changed files with 37 additions and 6 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -877,6 +877,9 @@ Release 0.23.0 - 2011-11-01
HDFS-2130. Switch default checksum to CRC32C. (todd)
HDFS-2533. Remove needless synchronization on some FSDataSet methods.
(todd)
BUG FIXES
HDFS-2347. Fix checkpointTxnCount's comment about editlog size.

40
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
View File

@ -1258,7 +1258,7 @@ public class FSDataset implements FSDatasetInterface {
/**
* Get File name for a given block.
*/
public synchronized File getBlockFile(String bpid, Block b)
public File getBlockFile(String bpid, Block b)
throws IOException {
File f = validateBlockFile(bpid, b);
if(f == null) {
@ -1271,16 +1271,44 @@ public class FSDataset implements FSDatasetInterface {
}
@Override // FSDatasetInterface
public synchronized InputStream getBlockInputStream(ExtendedBlock b)
public InputStream getBlockInputStream(ExtendedBlock b)
throws IOException {
return new FileInputStream(getBlockFile(b));
File f = getBlockFileNoExistsCheck(b);
try {
return new FileInputStream(f);
} catch (FileNotFoundException fnfe) {
throw new IOException("Block " + b + " is not valid. " +
"Expected block file at " + f + " does not exist.");
}
}
/**
* Return the File associated with a block, without first
* checking that it exists. This should be used when the
* next operation is going to open the file for read anyway,
* and thus the exists check is redundant.
*/
private File getBlockFileNoExistsCheck(ExtendedBlock b)
throws IOException {
File f = getFile(b.getBlockPoolId(), b.getLocalBlock());
if (f == null) {
throw new IOException("Block " + b + " is not valid");
}
return f;
}
@Override // FSDatasetInterface
public synchronized InputStream getBlockInputStream(ExtendedBlock b,
public InputStream getBlockInputStream(ExtendedBlock b,
long seekOffset) throws IOException {
File blockFile = getBlockFile(b);
RandomAccessFile blockInFile = new RandomAccessFile(blockFile, "r");
File blockFile = getBlockFileNoExistsCheck(b);
RandomAccessFile blockInFile;
try {
blockInFile = new RandomAccessFile(blockFile, "r");
} catch (FileNotFoundException fnfe) {
throw new IOException("Block " + b + " is not valid. " +
"Expected block file at " + blockFile + " does not exist.");
}
if (seekOffset > 0) {
blockInFile.seek(seekOffset);
}