Sankar Hariappan created HIVE-19435:
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Summary: Data lost when Incremental REPL LOAD with Drop
partitioned table followed by create/insert non-partitioned table with same
name.
Key: HIVE-19435
URL: https://issues.apache.org/jira/browse/HIVE-19435
Project: Hive
Issue Type: Bug
Components: HiveServer2, repl
Affects Versions: 3.0.0
Reporter: Sankar Hariappan
Assignee: Sankar Hariappan
Fix For: 3.0.0, 3.1.0
Hive replication uses Hadoop distcp to copy files from primary to replica
warehouse. If the HDFS block size is different across clusters, it cause file
copy failures.
{code:java}
2018-04-09 14:32:06,690 ERROR [main] org.apache.hadoop.tools.mapred.CopyMapper:
Failure in copying
hdfs://chelsea/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/000259_0 to
hdfs://marilyn/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/.hive-staging_hive_2018-04-09_14-30-45_723_7153496419225102220-2/-ext-10001/000259_0
java.io.IOException: File copy failed:
hdfs://chelsea/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/000259_0 -->
hdfs://marilyn/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/.hive-staging_hive_2018-04-09_14-30-45_723_7153496419225102220-2/-ext-10001/000259_0
at
org.apache.hadoop.tools.mapred.CopyMapper.copyFileWithRetry(CopyMapper.java:299)
at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:266)
at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:52)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:170)
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:1869)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)
Caused by: java.io.IOException: Couldn't run retriable-command: Copying
hdfs://chelsea/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/000259_0 to
hdfs://marilyn/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/.hive-staging_hive_2018-04-09_14-30-45_723_7153496419225102220-2/-ext-10001/000259_0
at
org.apache.hadoop.tools.util.RetriableCommand.execute(RetriableCommand.java:101)
at
org.apache.hadoop.tools.mapred.CopyMapper.copyFileWithRetry(CopyMapper.java:296)
... 10 more
Caused by: java.io.IOException: Check-sum mismatch between
hdfs://chelsea/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/000259_0 and
hdfs://marilyn/apps/hive/warehouse/tpch_flat_orc_1000.db/customer/.hive-staging_hive_2018-04-09_14-30-45_723_7153496419225102220-2/-ext-10001/.distcp.tmp.attempt_1522833620762_4416_m_000000_0.
Source and target differ in block-size. Use -pb to preserve block-sizes during
copy. Alternatively, skip checksum-checks altogether, using -skipCrc. (NOTE: By
skipping checksums, one runs the risk of masking data-corruption during
file-transfer.)
at
org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.compareCheckSums(RetriableFileCopyCommand.java:212)
at
org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doCopy(RetriableFileCopyCommand.java:130)
at
org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doExecute(RetriableFileCopyCommand.java:99)
at
org.apache.hadoop.tools.util.RetriableCommand.execute(RetriableCommand.java:87)
... 11 more
{code}
Distcp failed as the CM path for the file doesn't point to source file system.
So, it is needed to get the qualified cm root URI as part of files listed in
dump.
Also, REPL LOAD returns success even if distcp jobs failed.
CopyUtils.doCopyRetry doesn't throw error if copy failed even after maximum
attempts.
So, need to perform 2 things.
# If copy of multiple files fail for some reason, then retry with same set of
files again but need to set CM path if original source file is missing or
modified based on checksum. Let distcp to skip the properly copied files.
FileUtil.copy will always overwrite the files.
# If source path is moved to CM path, then delete the incorrectly copied files.
# If copy fails for maximum attempt, then throw error.
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