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https://issues.apache.org/jira/browse/CASSANDRA-4559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450947#comment-13450947
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Brandon Williams commented on CASSANDRA-4559:
---------------------------------------------
Every once in a long while you can see this exception:
{{noformat}}
ERROR 20:30:18,355 Exception in thread Thread[OptionalTasks:1,5,main]
java.lang.NullPointerException
at
org.apache.cassandra.locator.TokenMetadata.removeFromRelocating(TokenMetadata.java:443)
at
org.apache.cassandra.service.StorageService$2.run(StorageService.java:1252)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
{{noformat}
I suspect this is because we're using the same interval (RING_DELAY) and
sometimes they coincide. We can just double the relocation removal.
> implement token relocation
> --------------------------
>
> Key: CASSANDRA-4559
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4559
> Project: Cassandra
> Issue Type: Sub-task
> Components: Core, Tools
> Affects Versions: 1.2.0 beta 1
> Reporter: Eric Evans
> Assignee: Eric Evans
> Labels: vnodes
> Fix For: 1.2.0 beta 1
>
> Attachments: 4559.txt
>
>
> Whatever the specifics of a _shuffle_ (see CASSANDRA-4443), it will be
> necessary to relocate a range from one node to another.
> _Edit0: Linked in new patch containing tests._
> ----
> h3. Patches
> ||Compare||Raw diff||Description||
> |[010_refactor_range_move|https://github.com/acunu/cassandra/compare/top-bases/p/4443/010_refactor_range_move...p/4443/010_refactor_range_move]|[010_refactor_range_move.patch|https://github.com/acunu/cassandra/compare/top-bases/p/4443/010_refactor_range_move...p/4443/010_refactor_range_move.diff]|No
> Description|
> |[020_calculate_pending|https://github.com/acunu/cassandra/compare/top-bases/p/4443/020_calculate_pending...p/4443/020_calculate_pending]|[020_calculate_pending.patch|https://github.com/acunu/cassandra/compare/top-bases/p/4443/020_calculate_pending...p/4443/020_calculate_pending.diff]|No
> Description|
> |[030_relocate_token|https://github.com/acunu/cassandra/compare/top-bases/p/4443/030_relocate_token...p/4443/030_relocate_token]|[030_relocate_token.patch|https://github.com/acunu/cassandra/compare/top-bases/p/4443/030_relocate_token...p/4443/030_relocate_token.diff]|No
> Description|
> |[040_tests|https://github.com/acunu/cassandra/compare/top-bases/p/4443/040_tests...p/4443/040_tests]|[040_tests.patch|https://github.com/acunu/cassandra/compare/top-bases/p/4443/040_tests...p/4443/040_tests.diff]|No
> Description|
> ----
> _Note: These are branches managed with TopGit. If you are applying the patch
> output manually, you will either need to filter the TopGit metadata files
> (i.e. {{wget -O - <url> | filterdiff -x*.topdeps -x*.topmsg | patch -p1}}),
> or remove them afterward ({{rm .topmsg .topdeps}})._
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