[ 
https://issues.apache.org/jira/browse/HDDS-1555?focusedWorklogId=247423&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-247423
 ]

ASF GitHub Bot logged work on HDDS-1555:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 23/May/19 14:10
            Start Date: 23/May/19 14:10
    Worklog Time Spent: 10m 
      Work Description: jiwq commented on pull request #846: HDDS-1555. Disable 
install snapshot for ContainerStateMachine.
URL: https://github.com/apache/hadoop/pull/846#discussion_r286962091
 
 

 ##########
 File path: 
hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/ScmConfigKeys.java
 ##########
 @@ -146,7 +146,7 @@
 
   public static final String DFS_RATIS_SNAPSHOT_THRESHOLD_KEY =
       "dfs.ratis.snapshot.threshold";
-  public static final long DFS_RATIS_SNAPSHOT_THRESHOLD_DEFAULT = 10000;
+  public static final long DFS_RATIS_SNAPSHOT_THRESHOLD_DEFAULT = 100000;
 
 Review comment:
   What's the purpose modified it?
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 247423)
    Time Spent: 0.5h  (was: 20m)

> Disable install snapshot for ContainerStateMachine
> --------------------------------------------------
>
>                 Key: HDDS-1555
>                 URL: https://issues.apache.org/jira/browse/HDDS-1555
>             Project: Hadoop Distributed Data Store
>          Issue Type: Bug
>          Components: Ozone Datanode
>    Affects Versions: 0.3.0
>            Reporter: Mukul Kumar Singh
>            Assignee: Siddharth Wagle
>            Priority: Major
>              Labels: MiniOzoneChaosCluster, pull-request-available
>             Fix For: 0.5.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> In case a follower lags behind the leader by a large number, the leader tries 
> to send the snapshot to the follower. For ContainerStateMachine, the 
> information in the snapshot it not the entire state machine data. 
> InstallSnapshot for ContainerStateMachine should be disabled.
> {code}
> 2019-05-19 10:58:22,198 WARN  server.GrpcLogAppender 
> (GrpcLogAppender.java:installSnapshot(423)) - 
> GrpcLogAppender(e3e19760-1340-4acd-b50d-f8a796a97254->28d9bd2f-3fe2-4a69-8120-757a00fa2f20):
>  failed to install snapshot 
> [/Users/msingh/code/apache/ozone/github/git_oz_bugs_fixes/hadoop-ozone/integration-test/target/test/data/MiniOzoneClusterImpl-c2a863ef-8be9-445c-886f-57cad3a7b12e/datanode-6/data/ratis/fb88b749-3e75-4381-8973-6e0cb4904c7e/sm/snapshot.2_190]:
>  {}
> java.lang.NullPointerException
>         at 
> org.apache.ratis.server.impl.LogAppender.readFileChunk(LogAppender.java:369)
>         at 
> org.apache.ratis.server.impl.LogAppender.access$1100(LogAppender.java:54)
>         at 
> org.apache.ratis.server.impl.LogAppender$SnapshotRequestIter$1.next(LogAppender.java:318)
>         at 
> org.apache.ratis.server.impl.LogAppender$SnapshotRequestIter$1.next(LogAppender.java:303)
>         at 
> org.apache.ratis.grpc.server.GrpcLogAppender.installSnapshot(GrpcLogAppender.java:412)
>         at 
> org.apache.ratis.grpc.server.GrpcLogAppender.runAppenderImpl(GrpcLogAppender.java:101)
>         at 
> org.apache.ratis.server.impl.LogAppender$AppenderDaemon.run(LogAppender.java:80)
>         at java.lang.Thread.run(Thread.java:748)
> {code}



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