public void close() throws IOException, InterruptedException {
m_saveFile.close();
for (final Thread t : m_converterThreads) {
t.interrupt();
t.join();
}
}
/**
* Takes a snapshot of all the tables in the database now and check all the rows in each table to
* see if they satisfy the constraints. The constraints should be added with the table name and
* table id 0.
*
* <p>Since the snapshot files reside on the servers, we have to copy them over to the client in
* order to check. This might be an overkill, but the alternative is to ask the user to write
* stored procedure for each table and execute them on all nodes. That's not significantly better,
* either.
*
* <p>This function blocks. Should only be run at the end.
*
* @return true if all tables passed the test, false otherwise.
*/
protected boolean checkTables() {
String dir = "/tmp";
String nonce = "data_verification";
ClientConfig clientConfig = new ClientConfig(m_username, m_password);
clientConfig.setExpectedOutgoingMessageSize(getExpectedOutgoingMessageSize());
clientConfig.setHeavyweight(false);
Client client = ClientFactory.createClient(clientConfig);
// Host ID to IP mappings
LinkedHashMap<Integer, String> hostMappings = new LinkedHashMap<Integer, String>();
/*
* The key is the table name. the first one in the pair is the hostname,
* the second one is file name
*/
LinkedHashMap<String, Pair<String, String>> snapshotMappings =
new LinkedHashMap<String, Pair<String, String>>();
boolean isSatisfied = true;
// Load the native library for loading table from snapshot file
org.voltdb.EELibraryLoader.loadExecutionEngineLibrary(true);
try {
boolean keepTrying = true;
VoltTable[] response = null;
client.createConnection(m_host);
// Only initiate the snapshot if it's the first client
while (m_id == 0) {
// Take a snapshot of the database. This call is blocking.
response = client.callProcedure("@SnapshotSave", dir, nonce, 1).getResults();
if (response.length != 1
|| !response[0].advanceRow()
|| !response[0].getString("RESULT").equals("SUCCESS")) {
if (keepTrying && response[0].getString("ERR_MSG").contains("ALREADY EXISTS")) {
client.callProcedure("@SnapshotDelete", new String[] {dir}, new String[] {nonce});
keepTrying = false;
continue;
}
System.err.println("Failed to take snapshot");
return false;
}
break;
}
// Clients other than the one that initiated the snapshot
// have to check if the snapshot has completed
if (m_id > 0) {
int maxTry = 10;
while (maxTry-- > 0) {
boolean found = false;
response = client.callProcedure("@SnapshotStatus").getResults();
if (response.length != 2) {
System.err.println("Failed to get snapshot status");
return false;
}
while (response[0].advanceRow()) {
if (response[0].getString("NONCE").equals(nonce)) {
found = true;
break;
}
}
if (found) {
// This probably means the snapshot is done
if (response[0].getLong("END_TIME") > 0) break;
}
try {
Thread.sleep(500);
} catch (InterruptedException e) {
return false;
}
}
}
// Get host ID to hostname mappings
response = client.callProcedure("@SystemInformation").getResults();
if (response.length != 1) {
System.err.println("Failed to get host ID to IP address mapping");
return false;
}
while (response[0].advanceRow()) {
if (!response[0].getString("KEY").equals("HOSTNAME")) {
continue;
}
hostMappings.put(
(Integer) response[0].get("HOST_ID", VoltType.INTEGER), response[0].getString("VALUE"));
}
/* DUMP THE HOST MAPPINGS:
System.err.println("\n\nhostMappings: ");
for (Integer i : hostMappings.keySet()) {
System.err.println("\tkey: " + i + " value: " + hostMappings.get(i));
}
*/
// Do a scan to get all the file names and table names
response = client.callProcedure("@SnapshotScan", dir).getResults();
if (response.length != 3) {
System.err.println("Failed to get snapshot filenames");
return false;
}
// Only copy the snapshot files we just created
while (response[0].advanceRow()) {
if (!response[0].getString("NONCE").equals(nonce)) continue;
String[] tables = response[0].getString("TABLES_REQUIRED").split(",");
for (String t : tables) {
snapshotMappings.put(t, null);
}
break;
}
/* DUMP THE SNAPSHOT MAPPINGS:
System.err.println("\n\nsnapshotMappings: ");
for (String i : snapshotMappings.keySet()) {
System.err.println("\tkey: " + i + " value: " + snapshotMappings.get(i));
}
*/
while (response[2].advanceRow()) {
int id = (Integer) response[2].get("HOST_ID", VoltType.INTEGER);
String tableName = response[2].getString("TABLE");
if (!snapshotMappings.containsKey(tableName) || !hostMappings.containsKey(id)) {
System.err.println("FAILED configuring snapshotMappings for: ");
System.err.println(
"snapshottingMapping[" + tableName + "] " + snapshotMappings.get(tableName));
System.err.println("hostMappings[" + id + "] " + hostMappings.get(id));
continue;
}
snapshotMappings.put(
tableName, Pair.of(hostMappings.get(id), response[2].getString("NAME")));
}
} catch (NoConnectionsException e) {
e.printStackTrace();
return false;
} catch (ProcCallException e) {
e.printStackTrace();
return false;
} catch (UnknownHostException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
// Iterate through all the tables
System.err.println("Checking " + m_tableCheckOrder.size() + " table contraints");
for (String tableName : m_tableCheckOrder) {
Pair<String, String> value = snapshotMappings.get(tableName);
if (value == null) {
System.err.println("No snapshot mapping for table: " + tableName);
continue;
}
String hostName = value.getFirst();
File file = new File(dir, value.getSecond());
FileInputStream inputStream = null;
TableSaveFile saveFile = null;
long rowCount = 0;
Pair<String, Integer> key = Pair.of(tableName, 0);
if (!m_constraints.containsKey(key) || hostName == null) {
System.err.println("No constraint for : " + tableName);
continue;
}
// Copy the file over
String localhostName = ConnectionUtil.getHostnameOrAddress();
final SSHTools ssh = new SSHTools(m_username);
if (!hostName.equals("localhost") && !hostName.equals(localhostName)) {
if (!ssh.copyFromRemote(file.getPath(), hostName, file.getPath())) {
System.err.println(
"Failed to copy the snapshot file " + file.getPath() + " from host " + hostName);
return false;
}
}
if (!file.exists()) {
System.err.println(
"Snapshot file "
+ file.getPath()
+ " cannot be copied from "
+ hostName
+ " to localhost");
return false;
}
try {
try {
inputStream = new FileInputStream(file);
saveFile = new TableSaveFile(inputStream.getChannel(), 3, null);
// Get chunks from table
while (isSatisfied && saveFile.hasMoreChunks()) {
final BBContainer chunk = saveFile.getNextChunk();
VoltTable table = null;
// This probably should not happen
if (chunk == null) continue;
table = PrivateVoltTableFactory.createVoltTableFromBuffer(chunk.b, true);
// Now, check each row
while (isSatisfied && table.advanceRow()) {
isSatisfied = Verification.checkRow(m_constraints.get(key), table);
rowCount++;
}
// Release the memory of the chunk we just examined, be good
chunk.discard();
}
} finally {
if (saveFile != null) {
saveFile.close();
}
if (inputStream != null) inputStream.close();
if (!hostName.equals("localhost") && !hostName.equals(localhostName) && !file.delete())
System.err.println("Failed to delete snapshot file " + file.getPath());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
if (isSatisfied) {
System.err.println("Table " + tableName + " with " + rowCount + " rows passed check");
} else {
System.err.println("Table " + tableName + " failed check");
break;
}
}
// Clean up the snapshot we made
try {
if (m_id == 0) {
client
.callProcedure("@SnapshotDelete", new String[] {dir}, new String[] {nonce})
.getResults();
}
} catch (IOException e) {
e.printStackTrace();
} catch (ProcCallException e) {
e.printStackTrace();
}
System.err.println(
"Table checking finished " + (isSatisfied ? "successfully" : "with failures"));
return isSatisfied;
}