Ted Yu created HADOOP-15850:
-------------------------------
Summary: Allow CopyCommitter to skip concatenating source files
specified by DistCpConstants.CONF_LABEL_LISTING_FILE_PATH
Key: HADOOP-15850
URL: https://issues.apache.org/jira/browse/HADOOP-15850
Project: Hadoop Common
Issue Type: Task
Reporter: Ted Yu
I was investigating test failure of TestIncrementalBackupWithBulkLoad from
hbase against hadoop 3.1.1
hbase MapReduceBackupCopyJob$BackupDistCp would create listing file:
{code}
LOG.debug("creating input listing " + listing + " , totalRecords=" +
totalRecords);
cfg.set(DistCpConstants.CONF_LABEL_LISTING_FILE_PATH, listing);
cfg.setLong(DistCpConstants.CONF_LABEL_TOTAL_NUMBER_OF_RECORDS,
totalRecords);
{code}
For the test case, two bulk loaded hfiles are in the listing:
{code}
2018-10-13 14:09:24,123 DEBUG [Time-limited test]
mapreduce.MapReduceBackupCopyJob$BackupDistCp(195): BackupDistCp :
hdfs://localhost:42796/user/hbase/test-data/160aeab5-6bca-9f87-465e-2517a0c43119/data/default/test-1539439707496/96b5a3613d52f4df1ba87a1cef20684c/f/394e6d39a9b94b148b9089c4fb967aad_SeqId_205_
2018-10-13 14:09:24,125 DEBUG [Time-limited test]
mapreduce.MapReduceBackupCopyJob$BackupDistCp(195): BackupDistCp :
hdfs://localhost:42796/user/hbase/test-data/160aeab5-6bca-9f87-465e-2517a0c43119/data/default/test-1539439707496/96b5a3613d52f4df1ba87a1cef20684c/f/a7599081e835440eb7bf0dd3ef4fd7a5_SeqId_205_
2018-10-13 14:09:24,125 DEBUG [Time-limited test]
mapreduce.MapReduceBackupCopyJob$BackupDistCp(197): BackupDistCp execute for 2
files of 10242
{code}
Later on, CopyCommitter#concatFileChunks would throw the following exception:
{code}
2018-10-13 14:09:25,351 WARN [Thread-936] mapred.LocalJobRunner$Job(590):
job_local1795473782_0004
java.io.IOException: Inconsistent sequence file: current chunk file
org.apache.hadoop.tools.CopyListingFileStatus@bb8826ee{hdfs://localhost:42796/user/hbase/test-data/
160aeab5-6bca-9f87-465e-2517a0c43119/data/default/test-1539439707496/96b5a3613d52f4df1ba87a1cef20684c/f/a7599081e835440eb7bf0dd3ef4fd7a5_SeqId_205_
length = 5100 aclEntries = null, xAttrs = null} doesnt match prior entry
org.apache.hadoop.tools.CopyListingFileStatus@243d544d{hdfs://localhost:42796/user/hbase/test-data/160aeab5-6bca-9f87-465e-
2517a0c43119/data/default/test-1539439707496/96b5a3613d52f4df1ba87a1cef20684c/f/394e6d39a9b94b148b9089c4fb967aad_SeqId_205_
length = 5142 aclEntries = null, xAttrs = null}
at
org.apache.hadoop.tools.mapred.CopyCommitter.concatFileChunks(CopyCommitter.java:276)
at
org.apache.hadoop.tools.mapred.CopyCommitter.commitJob(CopyCommitter.java:100)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:567)
{code}
The above warning shouldn't happen - the two bulk loaded hfiles are independent.
>From the contents of the two CopyListingFileStatus instances, we can see that
>their isSplit() return false. Otherwise the following from toString should be
>logged:
{code}
if (isSplit()) {
sb.append(", chunkOffset = ").append(this.getChunkOffset());
sb.append(", chunkLength = ").append(this.getChunkLength());
}
{code}
>From hbase side, we can specify one bulk loaded hfile per job but that defeats
>the purpose of using DistCp.
There should be a way for DistCp to specify the skipping of source file
concatenation.
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