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HDFS-6529. Trace logging for RemoteBlockReader2 to identify remote datanode and file being read. Contributed by Anubhav Dhoot. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1602539 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Aaron Myers 2014-06-14 00:59:47 +00:00
parent 9313bbd06e
commit 018793faa7
2 changed files with 17 additions and 0 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -180,6 +180,9 @@ Release 2.5.0 - UNRELEASED
HDFS-6470. TestBPOfferService.testBPInitErrorHandling is flaky.
(Ming Ma via wang)
HDFS-6529. Trace logging for RemoteBlockReader2 to identify remote datanode
and file being read. (Anubhav Dhoot via atm)
OPTIMIZATIONS
HDFS-6214. Webhdfs has poor throughput for files >2GB (daryn)

14
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/RemoteBlockReader2.java
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@ -26,6 +26,7 @@ import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.util.EnumSet;
import java.util.UUID;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
@ -133,9 +134,22 @@ public class RemoteBlockReader2 implements BlockReader {
public synchronized int read(byte[] buf, int off, int len)
throws IOException {
UUID randomId = null;
if (LOG.isTraceEnabled()) {
randomId = UUID.randomUUID();
LOG.trace(String.format("Starting read #%s file %s from datanode %s",
randomId.toString(), this.filename,
this.datanodeID.getHostName()));
}
if (curDataSlice == null || curDataSlice.remaining() == 0 && bytesNeededToFinish > 0) {
readNextPacket();
}
if (LOG.isTraceEnabled()) {
LOG.trace(String.format("Finishing read #" + randomId));
}
if (curDataSlice.remaining() == 0) {
// we're at EOF now
return -1;