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HDFS-13882. Set a maximum delay for retrying locateFollowingBlock. Contributed by Kitti Nanasi.

Browse Source 
Signed-off-by: Xiao Chen <xiao@apache.org>
This commit is contained in:
Kitti Nanasi 2018-10-10 08:54:50 -07:00 committed by Xiao Chen
parent 90552b1ea8
commit 10185d9a77
6 changed files with 80 additions and 13 deletions
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21
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
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@ -942,6 +942,7 @@ protected void completeFile(ExtendedBlock last) throws IOException {
long localstart = Time.monotonicNow();
final DfsClientConf conf = dfsClient.getConf();
long sleeptime = conf.getBlockWriteLocateFollowingInitialDelayMs();
long maxSleepTime = conf.getBlockWriteLocateFollowingMaxDelayMs();
boolean fileComplete = false;
int retries = conf.getNumBlockWriteLocateFollowingRetry();
while (!fileComplete) {
@ -965,7 +966,7 @@ protected void completeFile(ExtendedBlock last) throws IOException {
}
retries--;
Thread.sleep(sleeptime);
sleeptime *= 2;
sleeptime = calculateDelayForNextRetry(sleeptime, maxSleepTime);
if (Time.monotonicNow() - localstart > 5000) {
DFSClient.LOG.info("Could not complete " + src + " retrying...");
}
@ -1075,6 +1076,7 @@ static LocatedBlock addBlock(DatanodeInfo[] excludedNodes,
final DfsClientConf conf = dfsClient.getConf();
int retries = conf.getNumBlockWriteLocateFollowingRetry();
long sleeptime = conf.getBlockWriteLocateFollowingInitialDelayMs();
long maxSleepTime = conf.getBlockWriteLocateFollowingMaxDelayMs();
long localstart = Time.monotonicNow();
while (true) {
try {
@ -1106,7 +1108,7 @@ static LocatedBlock addBlock(DatanodeInfo[] excludedNodes,
LOG.warn("NotReplicatedYetException sleeping " + src
+ " retries left " + retries);
Thread.sleep(sleeptime);
sleeptime *= 2;
sleeptime = calculateDelayForNextRetry(sleeptime, maxSleepTime);
} catch (InterruptedException ie) {
LOG.warn("Caught exception", ie);
}
@ -1117,4 +1119,19 @@ static LocatedBlock addBlock(DatanodeInfo[] excludedNodes,
}
}
}
/**
* Calculates the delay for the next retry.
*
* The delay is increased exponentially until the maximum delay is reached.
*
* @param previousDelay delay for the previous retry
* @param maxDelay maximum delay
* @return the minimum of the double of the previous delay
* and the maximum delay
*/
private static long calculateDelayForNextRetry(long previousDelay,
long maxDelay) {
return Math.min(previousDelay * 2, maxDelay);
}
}

3
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java
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@ -322,6 +322,9 @@ interface BlockWrite {
String LOCATEFOLLOWINGBLOCK_INITIAL_DELAY_MS_KEY =
PREFIX + "locateFollowingBlock.initial.delay.ms";
int LOCATEFOLLOWINGBLOCK_INITIAL_DELAY_MS_DEFAULT = 400;
String LOCATEFOLLOWINGBLOCK_MAX_DELAY_MS_KEY =
PREFIX + "locateFollowingBlock.max.delay.ms";
int LOCATEFOLLOWINGBLOCK_MAX_DELAY_MS_DEFAULT = 60000;
interface ReplaceDatanodeOnFailure {
String PREFIX = BlockWrite.PREFIX + "replace-datanode-on-failure.";

8
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/DfsClientConf.java
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@ -122,6 +122,7 @@ public class DfsClientConf {
private final int numBlockWriteRetry;
private final int numBlockWriteLocateFollowingRetry;
private final int blockWriteLocateFollowingInitialDelayMs;
private final int blockWriteLocateFollowingMaxDelayMs;
private final long defaultBlockSize;
private final long prefetchSize;
private final short defaultReplication;
@ -237,6 +238,9 @@ public DfsClientConf(Configuration conf) {
blockWriteLocateFollowingInitialDelayMs = conf.getInt(
BlockWrite.LOCATEFOLLOWINGBLOCK_INITIAL_DELAY_MS_KEY,
BlockWrite.LOCATEFOLLOWINGBLOCK_INITIAL_DELAY_MS_DEFAULT);
blockWriteLocateFollowingMaxDelayMs = conf.getInt(
BlockWrite.LOCATEFOLLOWINGBLOCK_MAX_DELAY_MS_KEY,
BlockWrite.LOCATEFOLLOWINGBLOCK_MAX_DELAY_MS_DEFAULT);
uMask = FsPermission.getUMask(conf);
connectToDnViaHostname = conf.getBoolean(DFS_CLIENT_USE_DN_HOSTNAME,
DFS_CLIENT_USE_DN_HOSTNAME_DEFAULT);
@ -349,6 +353,10 @@ public int getBlockWriteLocateFollowingInitialDelayMs() {
return blockWriteLocateFollowingInitialDelayMs;
}
public int getBlockWriteLocateFollowingMaxDelayMs() {
return blockWriteLocateFollowingMaxDelayMs;
}
/**
* @return the hdfsTimeout
*/

13
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -3135,7 +3135,18 @@
<name>dfs.client.block.write.locateFollowingBlock.initial.delay.ms</name>
<value>400</value>
<description>The initial delay (unit is ms) for locateFollowingBlock,
the delay time will increase exponentially(double) for each retry.
the delay time will increase exponentially(double) for each retry
until dfs.client.block.write.locateFollowingBlock.max.delay.ms is reached,
after that the delay for each retry will be
dfs.client.block.write.locateFollowingBlock.max.delay.ms.
</description>
</property>
<property>
<name>dfs.client.block.write.locateFollowingBlock.max.delay.ms</name>
<value>60000</value>
<description>
The maximum delay (unit is ms) before retrying locateFollowingBlock.
</description>
</property>

47
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientRetries.java
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@ -1229,27 +1229,54 @@ static void parseMultipleLinearRandomRetry(String expected, String s) {
}
}
/**
* Tests default configuration values and configuration setting
* of locate following block delays and number of retries.
*
* Configuration values tested:
* - dfs.client.block.write.locateFollowingBlock.initial.delay.ms
* - dfs.client.block.write.locateFollowingBlock.max.delay.ms
* - dfs.client.block.write.locateFollowingBlock.retries
*/
@Test
public void testDFSClientConfigurationLocateFollowingBlockInitialDelay()
public void testDFSClientConfigurationLocateFollowingBlock()
throws Exception {
// test if HdfsClientConfigKeys.BlockWrite.LOCATEFOLLOWINGBLOCK_INITIAL_DELAY_KEY
// is not configured, verify DFSClient uses the default value 400.
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
final int initialDelayTestValue = 1000;
final int maxDelayTestValue = 35000;
final int retryTestValue = 7;
final int defaultInitialDelay = 400;
final int defaultMaxDelay = 60000;
final int defultRetry = 5;
try {
cluster.waitActive();
NamenodeProtocols nn = cluster.getNameNodeRpc();
DFSClient client = new DFSClient(null, nn, conf, null);
assertEquals(client.getConf().
getBlockWriteLocateFollowingInitialDelayMs(), 400);
assertEquals(defaultInitialDelay, client.getConf().
getBlockWriteLocateFollowingInitialDelayMs());
assertEquals(defaultMaxDelay, client.getConf().
getBlockWriteLocateFollowingMaxDelayMs());
assertEquals(defultRetry, client.getConf().
getNumBlockWriteLocateFollowingRetry());
// change HdfsClientConfigKeys.BlockWrite.LOCATEFOLLOWINGBLOCK_INITIAL_DELAY_KEY,
// verify DFSClient uses the configured value 1000.
conf.setInt(
HdfsClientConfigKeys.BlockWrite.LOCATEFOLLOWINGBLOCK_INITIAL_DELAY_MS_KEY,
1000);
initialDelayTestValue);
conf.setInt(
HdfsClientConfigKeys.BlockWrite.LOCATEFOLLOWINGBLOCK_MAX_DELAY_MS_KEY,
maxDelayTestValue);
conf.setInt(
HdfsClientConfigKeys.BlockWrite.LOCATEFOLLOWINGBLOCK_RETRIES_KEY,
retryTestValue);
client = new DFSClient(null, nn, conf, null);
assertEquals(client.getConf().
getBlockWriteLocateFollowingInitialDelayMs(), 1000);
assertEquals(initialDelayTestValue, client.getConf().
getBlockWriteLocateFollowingInitialDelayMs());
assertEquals(maxDelayTestValue, client.getConf().
getBlockWriteLocateFollowingMaxDelayMs());
assertEquals(retryTestValue, client.getConf().
getNumBlockWriteLocateFollowingRetry());
} finally {
cluster.shutdown();
}

1
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestHdfsConfigFields.java
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@ -43,6 +43,7 @@ public void initializeMemberVariables() {
configurationClasses = new Class[] { HdfsClientConfigKeys.class,
HdfsClientConfigKeys.Failover.class,
HdfsClientConfigKeys.StripedRead.class, DFSConfigKeys.class,
HdfsClientConfigKeys.BlockWrite.class,
HdfsClientConfigKeys.BlockWrite.ReplaceDatanodeOnFailure.class };
// Set error modes