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https://issues.apache.org/jira/browse/HBASE-15379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175336#comment-15175336
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Anoop Sam John commented on HBASE-15379:
----------------------------------------
Yes that is safer side.
> Fake cells created in read path not implementing SettableSequenceId
> -------------------------------------------------------------------
>
> Key: HBASE-15379
> URL: https://issues.apache.org/jira/browse/HBASE-15379
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Anoop Sam John
> Fix For: 2.0.0
>
>
> This issue found by [~appy]. In HBASE-14099 he says,
> I was doing some testing when I hit a weird issue, seems related to this, so
> re-opening it (apologies in advance if it's not). Here's the stack trace
> {noformat}
> java.io.IOException: java.lang.UnsupportedOperationException: Cell is not of
> type org.apache.hadoop.hbase.SettableSequenceId
> at org.apache.hadoop.hbase.CellUtil.setSequenceId(CellUtil.java:923)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.setCurrentCell(StoreFileScanner.java:231)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.requestSeek(StoreFileScanner.java:389)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.seekScanners(StoreScanner.java:348)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:212)
> at
> org.apache.hadoop.hbase.regionserver.HStore.createScanner(HStore.java:1873)
> at
> org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:1863)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:5487)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:2577)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2563)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2544)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2534)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:6659)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:6624)
> at
> org.apache.hadoop.hbase.regionserver.TestWithSingleHRegion.test(TestWithSingleHRegion.java:48)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
> at
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)
> at
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
> at
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
> {noformat}
> I think it's because of using changing from KeyValue to a different sub-class
> of {{Cell}}l which doesn't implement {{SettableSequenceId}}
> {noformat}
> - this.startKey =
> KeyValueUtil.createFirstDeleteFamilyOnRow(scan.getStartRow(),
> + this.startKey =
> CellUtil.createFirstDeleteFamilyCellOnRow(scan.getStartRow(),
> {noformat}
> To replicate it, download the attached hfiles somewhere, copy the
> TestWithSingleHRegion class to regionserver tests, change the ROOT_DIR
> appropriately and run it.
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