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DemoClient.py
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DemoClient.py
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#!/usr/bin/python
'''
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
'''
import sys
import time
import os
# Modify this import path to point to the correct location to thrift.
thrift_path = os.path.abspath('/Users/sergey/Downloads/thrift/lib/py/build/lib.macosx-10.8-intel-2.7')
sys.path.append(thrift_path)
gen_py_path = os.path.abspath('gen-py')
sys.path.append(gen_py_path)
from thrift import Thrift
from thrift.transport import TSocket, TTransport
from thrift.protocol import TBinaryProtocol
from hbase import ttypes
from hbase.Hbase import Client, ColumnDescriptor, Mutation
def printVersions(row, versions):
print "row: " + row + ", values: ",
for cell in versions:
print cell.value + "; ",
print
def printRow(entry):
print "row: " + entry.row + ", cols:",
for k in sorted(entry.columns):
print k + " => " + entry.columns[k].value,
print
def demo_client(host, port, is_framed_transport):
# Make socket
socket = TSocket.TSocket(host, port)
# Make transport
if is_framed_transport:
transport = TTransport.TFramedTransport(socket)
else:
transport = TTransport.TBufferedTransport(socket)
# Wrap in a protocol
protocol = TBinaryProtocol.TBinaryProtocol(transport)
# Create a client to use the protocol encoder
client = Client(protocol)
# Connect!
transport.open()
t = "demo_table"
#
# Scan all tables, look for the demo table and delete it.
#
print "scanning tables..."
for table in client.getTableNames():
print " found: %s" %(table)
if table == t:
if client.isTableEnabled(table):
print " disabling table: %s" %(t)
client.disableTable(table)
print " deleting table: %s" %(t)
client.deleteTable(table)
columns = []
col = ColumnDescriptor()
col.name = 'entry:'
col.maxVersions = 10
columns.append(col)
col = ColumnDescriptor()
col.name = 'unused:'
columns.append(col)
try:
print "creating table: %s" %(t)
client.createTable(t, columns)
except AlreadyExists, ae:
print "WARN: " + ae.message
cols = client.getColumnDescriptors(t)
print "column families in %s" %(t)
for col_name in cols.keys():
col = cols[col_name]
print " column: %s, maxVer: %d" % (col.name, col.maxVersions)
dummy_attributes = {}
#
# Test UTF-8 handling
#
invalid = "foo-\xfc\xa1\xa1\xa1\xa1\xa1"
valid = "foo-\xE7\x94\x9F\xE3\x83\x93\xE3\x83\xBC\xE3\x83\xAB";
# non-utf8 is fine for data
mutations = [Mutation(column="entry:foo",value=invalid)]
print str(mutations)
client.mutateRow(t, "foo", mutations, dummy_attributes)
# try empty strings
mutations = [Mutation(column="entry:", value="")]
client.mutateRow(t, "", mutations, dummy_attributes)
# this row name is valid utf8
mutations = [Mutation(column="entry:foo", value=valid)]
client.mutateRow(t, valid, mutations, dummy_attributes)
# non-utf8 is not allowed in row names
try:
mutations = [Mutation(column="entry:foo", value=invalid)]
client.mutateRow(t, invalid, mutations, dummy_attributes)
except ttypes.IOError, e:
print 'expected exception: %s' %(e.message)
# Run a scanner on the rows we just created
print "Starting scanner..."
scanner = client.scannerOpen(t, "", ["entry:"], dummy_attributes)
r = client.scannerGet(scanner)
while r:
printRow(r[0])
r = client.scannerGet(scanner)
print "Scanner finished"
#
# Run some operations on a bunch of rows.
#
for e in range(100, 0, -1):
# format row keys as "00000" to "00100"
row = "%0.5d" % (e)
mutations = [Mutation(column="unused:", value="DELETE_ME")]
client.mutateRow(t, row, mutations, dummy_attributes)
printRow(client.getRow(t, row, dummy_attributes)[0])
client.deleteAllRow(t, row, dummy_attributes)
mutations = [Mutation(column="entry:num", value="0"),
Mutation(column="entry:foo", value="FOO")]
client.mutateRow(t, row, mutations, dummy_attributes)
printRow(client.getRow(t, row, dummy_attributes)[0]);
mutations = [Mutation(column="entry:foo",isDelete=True),
Mutation(column="entry:num",value="-1")]
client.mutateRow(t, row, mutations, dummy_attributes)
printRow(client.getRow(t, row, dummy_attributes)[0])
mutations = [Mutation(column="entry:num", value=str(e)),
Mutation(column="entry:sqr", value=str(e*e))]
client.mutateRow(t, row, mutations, dummy_attributes)
printRow(client.getRow(t, row, dummy_attributes)[0])
time.sleep(0.05)
mutations = [Mutation(column="entry:num",value="-999"),
Mutation(column="entry:sqr",isDelete=True)]
client.mutateRowTs(t, row, mutations, 1, dummy_attributes) # shouldn't override latest
printRow(client.getRow(t, row, dummy_attributes)[0])
versions = client.getVer(t, row, "entry:num", 10, dummy_attributes)
printVersions(row, versions)
if len(versions) != 3:
print("FATAL: wrong # of versions")
sys.exit(-1)
r = client.get(t, row, "entry:foo", dummy_attributes)
# just to be explicit, we get lists back, if it's empty there was no matching row.
if len(r) > 0:
raise "shouldn't get here!"
columnNames = []
for (col, desc) in client.getColumnDescriptors(t).items():
print "column with name: "+desc.name
print desc
columnNames.append(desc.name+":")
print "Starting scanner..."
scanner = client.scannerOpenWithStop(t, "00020", "00040", columnNames, dummy_attributes)
r = client.scannerGet(scanner)
while r:
printRow(r[0])
r = client.scannerGet(scanner)
client.scannerClose(scanner)
print "Scanner finished"
transport.close()
if __name__ == '__main__':
import sys
if len(sys.argv) < 3:
print 'usage: %s <host> <port>' % __file__
sys.exit(1)
host = sys.argv[1]
port = sys.argv[2]
is_framed_transport = False
demo_client(host, port, is_framed_transport)