WAL(Write Ahead Log) operations..?

[Narenthirasamy]

Does happybase support turning off WAL(Write Ahead Log) while put and scan operation?

[wbolster]

Not currently, since those flags could not be set in the Thrift API from HBase versions. It seems more recent Thrift versions [1] do support a writeToWAL flag:

struct Mutation {
 1:bool isDelete = 0,
 2:Text column,
 3:Text value,
 :bool writeToWAL = 1
}

HappyBase does not have support for this flag at this moment. This looks like a useful addition though.

[1] http://svn.apache.org/viewvc/hbase/trunk/hbase-thrift/src/main/resources/org/apache/hadoop/hbase/thrift/Hbase.thrift?view=markup

[wbolster]

It occurred to me issue #36 already tracks this request, so I'm closing this as a duplicate.

[wbolster]

Fwiw, you mention the WAL in combination with scan operations. That doesn't make sense, since scans are read operations, and the WAL is only used for write operations, i.e. puts and deletes.

[wbolster]

Various data manipulation methods now support a wal argument; see issue #36 and 7cfb9ee.