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Posted to issues@kylin.apache.org by "Jacky Woo (JIRA)" <ji...@apache.org> on 2019/04/02 03:08:00 UTC
[jira] [Updated] (KYLIN-3930) ArrayIndexOutOfBoundsException when
building
[ https://issues.apache.org/jira/browse/KYLIN-3930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jacky Woo updated KYLIN-3930:
-----------------------------
Attachment: KYLIN-3930.master.01.patch
> ArrayIndexOutOfBoundsException when building
> --------------------------------------------
>
> Key: KYLIN-3930
> URL: https://issues.apache.org/jira/browse/KYLIN-3930
> Project: Kylin
> Issue Type: Bug
> Components: Job Engine
> Affects Versions: all
> Reporter: Jacky Woo
> Priority: Major
> Fix For: all
>
> Attachments: KYLIN-3930.master.01.patch
>
>
> h2. ArrayIndexOutOfBoundsException when building.
> I hive a cube building error with kylin-2.5.0:
> {code:java}
> 2019-03-31 02:45:18,460 ERROR [main] org.apache.kylin.engine.mr.KylinMapper:
> java.lang.ArrayIndexOutOfBoundsException
> at java.lang.System.arraycopy(Native Method)
> at org.apache.kylin.engine.mr.common.NDCuboidBuilder.buildKeyInternal(NDCuboidBuilder.java:106)
> at org.apache.kylin.engine.mr.common.NDCuboidBuilder.buildKey(NDCuboidBuilder.java:71)
> at org.apache.kylin.engine.mr.steps.NDCuboidMapper.doMap(NDCuboidMapper.java:112)
> at org.apache.kylin.engine.mr.steps.NDCuboidMapper.doMap(NDCuboidMapper.java:47)
> at org.apache.kylin.engine.mr.KylinMapper.map(KylinMapper.java:77)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:796)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
> {code}
> I checked the code of "NDCuboidBuilder.buildKeyInternal" method
> {code:java}
> private void buildKeyInternal(Cuboid parentCuboid, Cuboid childCuboid, ByteArray[] splitBuffers, ByteArray newKeyBodyBuf) {
> RowKeyEncoder rowkeyEncoder = rowKeyEncoderProvider.getRowkeyEncoder(childCuboid);
> // rowkey columns
> long mask = Long.highestOneBit(parentCuboid.getId());
> long parentCuboidId = parentCuboid.getId();
> long childCuboidId = childCuboid.getId();
> long parentCuboidIdActualLength = (long)Long.SIZE - Long.numberOfLeadingZeros(parentCuboid.getId());
> int index = rowKeySplitter.getBodySplitOffset(); // skip shard and cuboidId
> int offset = RowConstants.ROWKEY_SHARDID_LEN + RowConstants.ROWKEY_CUBOIDID_LEN; // skip shard and cuboidId
> for (int i = 0; i < parentCuboidIdActualLength; i++) {
> if ((mask & parentCuboidId) > 0) {// if the this bit position equals
> // 1
> if ((mask & childCuboidId) > 0) {// if the child cuboid has this
> // column
> System.arraycopy(splitBuffers[index].array(), splitBuffers[index].offset(), newKeyBodyBuf.array(), offset, splitBuffers[index].length());
> offset += splitBuffers[index].length();
> }
> index++;
> }
> mask = mask >> 1;
> }
> rowkeyEncoder.fillHeader(newKeyBodyBuf.array());
> }
> {code}
> Found that "offset = SHARDID_LEN + CUBOIDID_LEN" , which is wrong when cube is not sharding. In my case my cube's storage type is 0, which means it is not sharding.
> So, I set offset according to cube sharding, like below:
> {code:java}
> int offset = rowKeySplitter.getHeaderLength(); // skip shard and cuboidId
> {code}
> After modifying building succeeds in my environment.
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