Rohan Pednekar created HBASE-20723:
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Summary: WALSplitter uses the rootDir, which is walDir, as the
tableDir root path.
Key: HBASE-20723
URL: https://issues.apache.org/jira/browse/HBASE-20723
Project: HBase
Issue Type: Bug
Components: hbase
Affects Versions: 1.1.2
Reporter: Rohan Pednekar
Attachments: logs.zip
This is an Azure HDInsight HBase cluster with HDP 2.6. and HBase
1.1.2.2.6.3.2-14
By default the underlying data is going to wasb://xxxxx@yyyyy/hbase
I tried to move WAL folders to HDFS, which is the SSD mounted on each VM at
/mnt.
hbase.wal.dir= hdfs://mycluster/walontest
hbase.wal.dir.perms=700
hbase.rootdir.perms=700
hbase.rootdir=
wasb://XYZ[@hbaseperf.core.net|mailto:duohbase5ds...@duohbaseperf.blob.core.windows.net]/hbase
Procedure to reproduce this issue:
1. create a table in hbase shell
2. insert a row in hbase shell
3. reboot the VM which hosts that region
4. scan the table in hbase shell and it is empty
Looking at the region server logs:
{code}
2018-06-12 22:08:40,455 INFO [RS_LOG_REPLAY_OPS-wn2-duohba:16020-0-Writer-1]
wal.WALSplitter: This region's directory doesn't exist:
hdfs://mycluster/walontest/data/default/tb1/b7fd7db5694eb71190955292b3ff7648.
It is very likely that it was already split so it's safe to discard those edits.
{code}
The log split/replay ignored actual WAL due to WALSplitter is looking for the
region directory in the hbase.wal.dir we specified rather than the
hbase.rootdir.
Looking at the source code,
[https://github.com/hortonworks/hbase-release/blob/HDP-2.6.3.20-tag/hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALSplitter.java#L519]
it uses the rootDir, which is walDir, as the tableDir root path.
So if we use HBASE-17437, waldir and hbase rootdir are in different path or
even in different filesystem, then the #5 uses walDir as tableDir is apparently
wrong.
CC: [~zyork], [~yuzhih...@gmail.com] Attached the logs for quick review.
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