| //// |
| 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 |
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| //// |
| |
| Controlling Distributed Cache |
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| |
| Sqoop will copy the jars in $SQOOP_HOME/lib folder to job cache every |
| time when start a Sqoop job. When launched by Oozie this is unnecessary |
| since Oozie use its own Sqoop share lib which keeps Sqoop dependencies |
| in the distributed cache. Oozie will do the localization on each |
| worker node for the Sqoop dependencies only once during the first Sqoop |
| job and reuse the jars on worker node for subsquencial jobs. Using |
| option +--skip-dist-cache+ in Sqoop command when launched by Oozie will |
| skip the step which Sqoop copies its dependencies to job cache and save |
| massive I/O. |
