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HDFS-8278. When computing max-size-to-move in Balancer, count only the storage with remaining >= default block size.

This commit is contained in:
Tsz-Wo Nicholas Sze 2015-08-17 17:55:25 -07:00
parent 076c688780
commit 9ab89a9266
2 changed files with 14 additions and 5 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -458,6 +458,9 @@ Release 2.8.0 - UNRELEASED
HDFS-8880. NameNode metrics logging. (Arpit Agarwal)
HDFS-8278. When computing max-size-to-move in Balancer, count only the
storage with remaining >= default block size. (szetszwo)
OPTIMIZATIONS
HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than

16
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java
View File

@ -192,6 +192,7 @@ public class Balancer {
private final boolean runDuringUpgrade;
private final double threshold;
private final long maxSizeToMove;
private final long defaultBlockSize;
// all data node lists
private final Collection<Source> overUtilized = new LinkedList<Source>();
@ -270,6 +271,9 @@ static int getInt(Configuration conf, String key, int defaultValue) {
this.maxSizeToMove = getLong(conf,
DFSConfigKeys.DFS_BALANCER_MAX_SIZE_TO_MOVE_KEY,
DFSConfigKeys.DFS_BALANCER_MAX_SIZE_TO_MOVE_DEFAULT);
this.defaultBlockSize = getLong(conf,
DFSConfigKeys.DFS_BLOCK_SIZE_KEY,
DFSConfigKeys.DFS_BLOCK_SIZE_DEFAULT);
}
private static long getCapacity(DatanodeStorageReport report, StorageType t) {
@ -282,11 +286,13 @@ private static long getCapacity(DatanodeStorageReport report, StorageType t) {
return capacity;
}
private static long getRemaining(DatanodeStorageReport report, StorageType t) {
private long getRemaining(DatanodeStorageReport report, StorageType t) {
long remaining = 0L;
for(StorageReport r : report.getStorageReports()) {
if (r.getStorage().getStorageType() == t) {
remaining += r.getRemaining();
if (r.getRemaining() >= defaultBlockSize) {
remaining += r.getRemaining();
}
}
}
return remaining;
@ -323,7 +329,7 @@ private long init(List<DatanodeStorageReport> reports) {
final double utilizationDiff = utilization - policy.getAvgUtilization(t);
final double thresholdDiff = Math.abs(utilizationDiff) - threshold;
final long maxSize2Move = computeMaxSize2Move(capacity,
getRemaining(r, t), utilizationDiff, threshold, maxSizeToMove);
getRemaining(r, t), utilizationDiff, maxSizeToMove);
final StorageGroup g;
if (utilizationDiff > 0) {
@ -360,8 +366,8 @@ private long init(List<DatanodeStorageReport> reports) {
}
private static long computeMaxSize2Move(final long capacity, final long remaining,
final double utilizationDiff, final double threshold, final long max) {
final double diff = Math.min(threshold, Math.abs(utilizationDiff));
final double utilizationDiff, final long max) {
final double diff = Math.abs(utilizationDiff);
long maxSizeToMove = percentage2bytes(diff, capacity);
if (utilizationDiff < 0) {
maxSizeToMove = Math.min(remaining, maxSizeToMove);