celeborn/docs/migration.md

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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Migration Guide

Upgrading from 0.2 to 0.3

• Celeborn 0.2 Client is compatible with 0.3 Master/Server, it allows to upgrade Master/Worker first then Client. Note that: It's strongly recommended to use the same version of Client and Celeborn Master/Worker in production.

• Since 0.3.0, the support of deprecated configurations rss.* is removed. All configurations listed in 0.2.1 docs still take effect, but some of those are deprecated too, please read the bootstrap logs and follow the suggestion to migrate to the new configuration.

• From 0.3.0 on the default value for celeborn.client.push.replicate.enabled is changed from true to false, users who want replication on should explicitly enable replication. For example, to enable replication for Spark users should add the spark config when submitting job: spark.celeborn.client.push.replicate.enabled=true

• From 0.3.0 on the default value for celeborn.worker.storage.workingDir is changed from hadoop/rss-worker/shuffle_data to celeborn-worker/shuffle_data, users who want to use origin working dir path should set this configuration.

• Since 0.3.0, configuration namespace celeborn.ha.master is deprecated, and will be removed in the future versions. All configurations celeborn.ha.master.* should migrate to celeborn.master.ha.*.

• Since 0.3.0, environment variables CELEBORN_MASTER_HOST and CELEBORN_MASTER_PORT are removed. Instead CELEBORN_LOCAL_HOSTNAME works on both master and worker, which takes high priority than configurations defined in properties file.

• Since 0.3.0, the Celeborn Master URL schema is changed from rss:// to celeborn://, for users who start Worker by sbin/start-worker.sh rss://<master-host>:<master-port>, should migrate to sbin/start-worker.sh celeborn://<master-host>:<master-port>.

• Since 0.3.0, Celeborn supports overriding Hadoop configuration(core-site.xml, hdfs-site.xml, etc.) from Celeborn configuration with the additional prefix celeborn.hadoop.. On Spark client side, user should set Hadoop configuration like spark.celeborn.hadoop.foo=bar, note that spark.hadoop.foo=bar does not take effect; on Flink client and Celeborn Master/Worker side, user should set like celeborn.hadoop.foo=bar.

• Since 0.3.0, Celeborn master metrics BlacklistedWorkerCount is renamed as ExcludedWorkerCount.

• Since 0.3.0, Celeborn master http request url /blacklistedWorkers is renamed as /excludedWorkers.

• Since 0.3.0, introduces a terminology update for Celeborn worker data replication, replacing the previous master/slave terminology with primary/replica. In alignment with this change, corresponding metrics keywords have been adjusted. The following table presents a comprehensive overview of the changes:

  Key Before v0.3.0	Key After v0.3.0
  MasterPushDataTime	PrimaryPushDataTime
  MasterPushDataHandshakeTime	PrimaryPushDataHandshakeTime
  MasterRegionStartTime	PrimaryRegionStartTime
  MasterRegionFinishTime	PrimaryRegionFinishTime
  SlavePushDataTime	ReplicaPushDataTime
  SlavePushDataHandshakeTime	ReplicaPushDataHandshakeTime
  SlaveRegionStartTime	ReplicaRegionStartTime
  SlaveRegionFinishTime	ReplicaRegionFinishTime

• Since 0.3.0, Celeborn's spark shuffle manager change from org.apache.spark.shuffle.celeborn.RssShuffleManager to org.apache.spark.shuffle.celeborn.SparkShuffleManager. User can set spark property spark.shuffle.manager to org.apache.spark.shuffle.celeborn.SparkShuffleManager to use Celeborn remote shuffle service. In 0.3.0, Celeborn still support org.apache.spark.shuffle.celeborn.RssShuffleManager, it will be removed in 0.4.0.