About tyu

tyu · ‎06-22-2016

As the last ERROR showed you, the effective hbase-site.xml seems to not be on the classpath. The zookeeper ensemble was redacted. Please make sure the quorum is the one used by hbase.

tyu · ‎06-21-2016

Please take a look at hbase-shell//src/test/ruby/hbase/table_test.rb for sample syntax where x is column family: @test_table._scan_internal(FILTER => "SingleColumnValueFilter('x', 'a', >=, 'binary:\x82', true, true)", COLUMNS => 'x:a, x:b'

tyu · ‎06-21-2016

Hive using MR-over-hbase-snapshots would be a viable solution. Perform a snapshot in hbase, then use hive to directly read from the underlying HFiles.

tyu · ‎06-21-2016

You can use SingleColumnValueFilter on 'column1' Meanwhile, specify all the columns you want to retrieve using COLUMNS.

tyu · ‎06-20-2016

bq. Hbase created the columns based on alphabetical order When you query hbase, you observe alphabetical order because that's what hbase stores internally. Do you observe fewer than 10 rows after importing the sample data ?

tyu · ‎06-20-2016

18414 was the region server process. Was it still running ?

tyu · ‎06-20-2016

When I tried 'hbase' command within shell (HDP 2.5), I got: hbase(main):001:0> hbase org.apache.hadoop.hbase.mapreduce.ImportTsv NoMethodError: undefined method `hbase' for #<Object:0x415d88de>

tyu · ‎06-20-2016

hbase.csv should be placed on hdfs.

tyu · ‎06-20-2016

Disabled replication would still hold on to the WAL files because, it guarantees to not lose data between disable and enable. You can execute remove_peer, which frees up the WAL files eligible for deletion. When you re-add replication peer again, the replication would start from the current status, versus if you re-enable a peer, it will continue from where it left off.

tyu · ‎06-20-2016

There are currently two services which may keep the files in the archive directory. First is a TTL process, which ensures that the WAL files are kept at least for 10 min. This is controlled by hbase.master.logcleaner.ttl configuration property in master. The other one is replication. If you had replication setup before, the replication processes will hang on to the WAL files until they are replicated. Even if you disabled the replication, the files are still referenced. You can look at the logs of master from classes (LogCleaner, TimeToLiveLogCleaner, ReplicationLogCleaner) to see whether any exception was thrown.

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