Details
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Bug
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Status: Closed
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Major
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Resolution: Not A Problem
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v2.0.0
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None
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None
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None
Description
Merge started to work on last 7 segments.
During the process hbase had a failure because of spot-instances shutdown in Amazon. Data was not lost, because it is at S3.
I stopped kylin and did hbase hbck --repair. During the report of repair I didn't see any information about lost data, just redistribution of regions.
Then after kylin was started I cannot query data from the last 7 segments:
Caused by: java.lang.RuntimeException: org.apache.hadoop.hbase.TableNotFoundException: Table 'KYLIN_7MMHCHKVVB' was not found, got: KYLIN_7H3WSPX1UJ.
at com.google.common.base.Throwables.propagate(Throwables.java:160)
at org.apache.kylin.storage.hbase.cube.v2.ExpectedSizeIterator.next(ExpectedSizeIterator.java:67)
at org.apache.kylin.storage.hbase.cube.v2.ExpectedSizeIterator.next(ExpectedSizeIterator.java:31)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at com.google.common.collect.Iterators$6.hasNext(Iterators.java:583)
at org.apache.kylin.storage.gtrecord.SegmentCubeTupleIterator$2.hasNext(SegmentCubeTupleIterator.java:116)
at org.apache.kylin.storage.gtrecord.SegmentCubeTupleIterator.hasNext(SegmentCubeTupleIterator.java:149)
at com.google.common.collect.Iterators$6.hasNext(Iterators.java:582)
at org.apache.kylin.storage.gtrecord.SequentialCubeTupleIterator.hasNext(SequentialCubeTupleIterator.java:129)
at org.apache.kylin.query.enumerator.OLAPEnumerator.moveNext(OLAPEnumerator.java:67)
at Baz$1$1.moveNext(Unknown Source)
at org.apache.calcite.linq4j.EnumerableDefaults.groupBy_(EnumerableDefaults.java:826)
at org.apache.calcite.linq4j.EnumerableDefaults.groupBy(EnumerableDefaults.java:761)
at org.apache.calcite.linq4j.DefaultEnumerable.groupBy(DefaultEnumerable.java:302)
at Baz.bind(Unknown Source)
at org.apache.calcite.jdbc.CalcitePrepare$CalciteSignature.enumerable(CalcitePrepare.java:331)
at org.apache.calcite.jdbc.CalciteConnectionImpl.enumerable(CalciteConnectionImpl.java:294)
at org.apache.calcite.jdbc.CalciteMetaImpl._createIterable(CalciteMetaImpl.java:553)
at org.apache.calcite.jdbc.CalciteMetaImpl.createIterable(CalciteMetaImpl.java:544)
at org.apache.calcite.avatica.AvaticaResultSet.execute(AvaticaResultSet.java:193)
at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:67)
at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:44)
at org.apache.calcite.avatica.AvaticaConnection$1.execute(AvaticaConnection.java:607)
at org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:600)
at org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:615)
at org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:148)
... 77 more
Caused by: org.apache.hadoop.hbase.TableNotFoundException: Table 'KYLIN_7MMHCHKVVB' was not found, got: KYLIN_7H3WSPX1UJ.
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1310)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1189)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1173)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1130)
at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.getRegionLocation(ConnectionManager.java:965)
at org.apache.hadoop.hbase.client.HRegionLocator.getRegionLocation(HRegionLocator.java:83)
at org.apache.hadoop.hbase.client.HTable.getRegionLocation(HTable.java:505)
at org.apache.hadoop.hbase.client.HTable.getKeysAndRegionsInRange(HTable.java:721)
at org.apache.hadoop.hbase.client.HTable.getKeysAndRegionsInRange(HTable.java:691)
at org.apache.hadoop.hbase.client.HTable.getStartKeysInRange(HTable.java:1796)
at org.apache.hadoop.hbase.client.HTable.coprocessorService(HTable.java:1751)
at org.apache.kylin.storage.hbase.cube.v2.CubeHBaseEndpointRPC$1.run(CubeHBaseEndpointRPC.java:182)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
... 1 more
hbase really doesn't contain tables for the last 7 segments and I didn't call any cleanup jobs.
It looks like Merge removed old segment tables before merged segment was saved.
I'm going to continue to investigate this problem and will post more details next week.