尝试更新列值时，带有时间戳的Hbase失败

Question

I'm creating a row in hbase using a put as follows:

Put put = new Put(Bytes.toBytes(rowKey));
put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(qualifier), cellTimestamp, value);

These puts get batched and then added to hbase as:

table.setAutoFlushTo(true);
table.put(batch);
table.flushCommits();

This works for new rows. If I then try and update the column value and specify a new cellTimestamp, the data does not get updated. Is this possible? The hbase table is created with VERSIONS => '1'.

Thanks in advnace!

Answer 1

It's generally discouraged to provide the cellTimestamp, but in case you need it please make sure that cellTimestamp...

• ... is greater than the one of the previous version
• ... it's in milliseconds

Here are some nice readings about versioning & how HBase handles timestamps:

• http://hbase.apache.org/book/versions.html
• http://www.ngdata.com/bending-time-in-hbase