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HDFS-9521. TransferFsImage.receiveFile should account and log separate times for image download and fsync to disk. Contributed by Wellington Chevreuil

This commit is contained in:
Harsh J 2016-03-07 13:49:47 +05:30
parent 8ed2e060e8
commit fd1c09be3e
1 changed files with 27 additions and 6 deletions
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33
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/TransferFsImage.java
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@ -30,6 +30,7 @@ import java.net.URL;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
@ -481,6 +482,9 @@ public class TransferFsImage {
MD5Hash advertisedDigest, String fsImageName, InputStream stream,
DataTransferThrottler throttler) throws IOException {
long startTime = Time.monotonicNow();
Map<FileOutputStream, File> streamPathMap = new HashMap<>();
StringBuilder xferStats = new StringBuilder();
double xferCombined = 0;
if (localPaths != null) {
// If the local paths refer to directories, use the server-provided header
// as the filename within that directory
@ -517,7 +521,9 @@ public class TransferFsImage {
LOG.warn("Overwriting existing file " + f
+ " with file downloaded from " + url);
}
outputStreams.add(new FileOutputStream(f));
FileOutputStream fos = new FileOutputStream(f);
outputStreams.add(fos);
streamPathMap.put(fos, f);
} catch (IOException ioe) {
LOG.warn("Unable to download file " + f, ioe);
// This will be null if we're downloading the fsimage to a file
@ -550,11 +556,26 @@ public class TransferFsImage {
}
}
finishedReceiving = true;
double xferSec = Math.max(
((float)(Time.monotonicNow() - startTime)) / 1000.0, 0.001);
long xferKb = received / 1024;
xferCombined += xferSec;
xferStats.append(
String.format(" The fsimage download took %.2fs at %.2f KB/s.",
xferSec, xferKb / xferSec));
} finally {
stream.close();
for (FileOutputStream fos : outputStreams) {
long flushStartTime = Time.monotonicNow();
fos.getChannel().force(true);
fos.close();
double writeSec = Math.max(((float)
(flushStartTime - Time.monotonicNow())) / 1000.0, 0.001);
xferCombined += writeSec;
xferStats.append(String
.format(" Synchronous (fsync) write to disk of " +
streamPathMap.get(fos).getAbsolutePath() +
" took %.2fs.", writeSec));
}
// Something went wrong and did not finish reading.
@ -573,11 +594,11 @@ public class TransferFsImage {
advertisedSize);
}
}
double xferSec = Math.max(
((float)(Time.monotonicNow() - startTime)) / 1000.0, 0.001);
long xferKb = received / 1024;
LOG.info(String.format("Transfer took %.2fs at %.2f KB/s",
xferSec, xferKb / xferSec));
xferStats.insert(
0, String.format(
"Combined time for fsimage download and fsync " +
"to all disks took %.2fs.", xferCombined));
LOG.info(xferStats.toString());
if (digester != null) {
MD5Hash computedDigest = new MD5Hash(digester.digest());