lishuming created SPARK-21660:
---------------------------------
Summary: Yarn ShuffleService failed to start when the chosen
directory become read-only
Key: SPARK-21660
URL: https://issues.apache.org/jira/browse/SPARK-21660
Project: Spark
Issue Type: Bug
Components: Shuffle, YARN
Affects Versions: 2.1.1
Reporter: lishuming
h3. Background
In our production environment，disks corrupt to `read-only` status almost once a
month. Now the strategy of Yarn ShuffleService which chooses an available
directory(disk) to store Shuffle info(DB) is as
below(https://github.com/apache/spark/blob/master/common/network-yarn/src/main/java/org/apache/spark/network/yarn/YarnShuffleService.java#L340)：
1. If NameNode's recoveryPath not empty and shuffle DB exists in the
recoveryPath, return the recoveryPath;
2. If recoveryPath empty and shuffle DB exists in
`yarn.nodemanager.local-dirs`, set recoveryPath as the existing DB path and
return the path;
3. If recoveryPath not empty(shuffle DB not exists in the path) and shuffle DB
exists in `yarn.nodemanager.local-dirs`， mv the existing shuffle DB to
recoveryPath and return the path;
4. If all above don't hit, we choose the first disk of
`yarn.nodemanager.local-dirs`as the recoveryPath;
All above strategy don't consider the chosen disk(directory) is writable or
not, so in our environment we meet such exception:
{code:java}
2017-06-25 07:15:43,512 ERROR org.apache.spark.network.util.LevelDBProvider:
error opening leveldb file /mnt/dfs/12/yarn/local/registeredExecutors.ldb.
Creating new file, will not be able to recover state for existing applications
at
org.apache.spark.network.util.LevelDBProvider.initLevelDB(LevelDBProvider.java:48)
at
org.apache.spark.network.shuffle.ExternalShuffleBlockResolver.<init>(ExternalShuffleBlockResolver.java:116)
at
org.apache.spark.network.shuffle.ExternalShuffleBlockResolver.<init>(ExternalShuffleBlockResolver.java:94)
at
org.apache.spark.network.shuffle.ExternalShuffleBlockHandler.<init>(ExternalShuffleBlockHandler.java:66)
at
org.apache.spark.network.yarn.YarnShuffleService.serviceInit(YarnShuffleService.java:167)
2017-06-25 07:15:43,514 WARN org.apache.spark.network.util.LevelDBProvider:
error deleting /mnt/dfs/12/yarn/local/registeredExecutors.ldb
2017-06-25 07:15:43,515 INFO org.apache.hadoop.service.AbstractService: Service
spark_shuffle failed in state INITED; cause: java.io.IOException: Unable to
create state store
at
org.apache.spark.network.util.LevelDBProvider.initLevelDB(LevelDBProvider.java:77)
at
org.apache.spark.network.shuffle.ExternalShuffleBlockResolver.<init>(ExternalShuffleBlockResolver.java:116)
at
org.apache.spark.network.shuffle.ExternalShuffleBlockResolver.<init>(ExternalShuffleBlockResolver.java:94)
at
org.apache.spark.network.shuffle.ExternalShuffleBlockHandler.<init>(ExternalShuffleBlockHandler.java:66)
at
org.apache.spark.network.yarn.YarnShuffleService.serviceInit(YarnShuffleService.java:167)
at
org.apache.spark.network.util.LevelDBProvider.initLevelDB(LevelDBProvider.java:75)
{code}
h3. Consideration
1. For many production environment, `yarn.nodemanager.local-dirs` always has
more than 1 disk, so we can make a better chosen strategy to avoid the problem
above;
2. Can we add a strategy to check the DB directory we choose is writable, so
avoid the problem above?
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