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https://issues.apache.org/jira/browse/HBASE-28956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17910885#comment-17910885
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Hudson commented on HBASE-28956:
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Results for branch branch-2.5
[build #643 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/643/]:
(x) *{color:red}-1 overall{color}*
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(/) {color:green}+1 general checks{color}
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> RSMobFileCleanerChore may close the StoreFileReader object which is being
> used by Compaction thread
> ---------------------------------------------------------------------------------------------------
>
> Key: HBASE-28956
> URL: https://issues.apache.org/jira/browse/HBASE-28956
> Project: HBase
> Issue Type: Bug
> Components: Compaction, mob
> Affects Versions: 3.0.0-beta-1, 2.7.0, 2.6.1, 2.5.10
> Reporter: guluo
> Assignee: guluo
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.0.0, 2.7.0, 2.5.11, 2.6.2
>
>
> For MOB table, RSMobFileCleanerChore is responsible for cleaning MOB files
> that are no longer referebced by the region located in the current
> RegionServer.
> RSMobFileCleanerChore get the the information of MOB files by reading the
> storefile, as fallow.
> ```java
> // RSMobFileCleanerChore.chore()
> sf.initReader();
> byte[] mobRefData = sf.getMetadataValue(HStoreFile.MOB_FILE_REFS);
> byte[] bulkloadMarkerData = sf.getMetadataValue(HStoreFile.BULKLOAD_TASK_KEY);
> // close store file to avoid memory leaks
> sf.closeStoreFile(true);
> ```
> There is an issue in here, if the StoreFileReader was not created by
> RSMobFileCleanerChore, but RSMobFileCleanerChore closed it, which will cause
> the thread that created the object to be unusable, resuting ERROR finally.
>
> Reproduction:
> This is an occasional problem, but the probability of its occurrence can be
> increased by making the following modifications.
> 1. Setting hbase.master.mob.cleaner.period from 24h to 10s, and restart hbase.
> 2. Puting some mob data into a MOB table.
> 3. At the same time, executing compaction command for the MOB table, and it
> is possible that this problem may occur.
>
> The error logs as follow.
> ERROR: java.io.IOException: Cannot invoke
> "org.apache.hadoop.hbase.regionserver.StoreFileReader.getMaxTimestamp()"
> because the return value of
> "org.apache.hadoop.hbase.regionserver.HStoreFile.getReader()" is null
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:512)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:124)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:102)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:82)
> Caused by: java.lang.NullPointerException: Cannot invoke
> "org.apache.hadoop.hbase.regionserver.StoreFileReader.getMaxTimestamp()"
> because the return value of
> "org.apache.hadoop.hbase.regionserver.HStoreFile.getReader()" is null
> at
> org.apache.hadoop.hbase.regionserver.DefaultStoreFileManager.lambda$getUnneededFiles$3(DefaultStoreFileManager.java:235)
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