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Posted to issues@uniffle.apache.org by GitBox <gi...@apache.org> on 2022/07/14 14:20:03 UTC
[GitHub] [incubator-uniffle] jerqi commented on a diff in pull request #55: [Feature][MR] Support remote spill
jerqi commented on code in PR #55:
URL: https://github.com/apache/incubator-uniffle/pull/55#discussion_r921211301
##########
client-mr/src/main/java/org/apache/hadoop/mapreduce/v2/app/RssMRAppMaster.java:
##########
@@ -199,6 +200,24 @@ public Thread newThread(Runnable r) {
extraConf.set(RssMRConfig.RSS_REMOTE_STORAGE_PATH, remoteStorage.getPath());
extraConf.set(RssMRConfig.RSS_REMOTE_STORAGE_CONF, remoteStorage.getConfString());
+ // When containers have disk with very limited space, reduce is allowed to spill data to hdfs
+ if (extraConf.getBoolean(RssMRConfig.RSS_REDUCE_REMOTE_SPILL_ENABLED,
+ RssMRConfig.RSS_REDUCE_REMOTE_SPILL_ENABLED_DEFAULT)) {
+
+ if (storageType != StorageType.MEMORY_LOCALFILE_HDFS.name()) {
+ throw new IllegalArgumentException("Remote spill only supports "
+ + StorageType.MEMORY_LOCALFILE_HDFS.name() + " mode");
+ }
+
+ // Use minimized replica, because spilled data can be recomputed by reduce task.
+ // And task re-computation is much cheaper job re-computation
+ conf.setInt("dfs.replication", 1);
+
+ // When remote spill is enabled, reduce task is more easy to crash.
+ // We allow more attempts to avoid recomputing job.
+ conf.setInt(MRJobConfig.REDUCE_MAX_ATTEMPTS, 5);
Review Comment:
It's odd. The logic is wrong.
##########
client-mr/src/main/java/org/apache/hadoop/mapreduce/v2/app/RssMRAppMaster.java:
##########
@@ -199,6 +200,24 @@ public Thread newThread(Runnable r) {
extraConf.set(RssMRConfig.RSS_REMOTE_STORAGE_PATH, remoteStorage.getPath());
extraConf.set(RssMRConfig.RSS_REMOTE_STORAGE_CONF, remoteStorage.getConfString());
+ // When containers have disk with very limited space, reduce is allowed to spill data to hdfs
+ if (extraConf.getBoolean(RssMRConfig.RSS_REDUCE_REMOTE_SPILL_ENABLED,
+ RssMRConfig.RSS_REDUCE_REMOTE_SPILL_ENABLED_DEFAULT)) {
+
+ if (storageType != StorageType.MEMORY_LOCALFILE_HDFS.name()) {
+ throw new IllegalArgumentException("Remote spill only supports "
+ + StorageType.MEMORY_LOCALFILE_HDFS.name() + " mode");
+ }
+
+ // Use minimized replica, because spilled data can be recomputed by reduce task.
+ // And task re-computation is much cheaper job re-computation
+ conf.setInt("dfs.replication", 1);
Review Comment:
We shouldn't modify the configuration. It will affect the replication of output.
##########
client-mr/src/main/java/org/apache/hadoop/mapreduce/v2/app/RssMRAppMaster.java:
##########
@@ -199,6 +200,24 @@ public Thread newThread(Runnable r) {
extraConf.set(RssMRConfig.RSS_REMOTE_STORAGE_PATH, remoteStorage.getPath());
extraConf.set(RssMRConfig.RSS_REMOTE_STORAGE_CONF, remoteStorage.getConfString());
+ // When containers have disk with very limited space, reduce is allowed to spill data to hdfs
+ if (extraConf.getBoolean(RssMRConfig.RSS_REDUCE_REMOTE_SPILL_ENABLED,
+ RssMRConfig.RSS_REDUCE_REMOTE_SPILL_ENABLED_DEFAULT)) {
+
+ if (storageType != StorageType.MEMORY_LOCALFILE_HDFS.name()) {
Review Comment:
Could we check check remote storage path instead?
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