phet commented on code in PR #3765:
URL: https://github.com/apache/gobblin/pull/3765#discussion_r1322270827
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gobblin-runtime/src/main/java/org/apache/gobblin/runtime/api/MysqlMultiActiveLeaseArbiterTestingDecorator.java:
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@@ -0,0 +1,206 @@
+package org.apache.gobblin.runtime.api;
+
+import com.google.common.base.Optional;
+import com.typesafe.config.Config;
+import java.io.IOException;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.HashMap;
+import javax.inject.Inject;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.gobblin.configuration.ConfigurationKeys;
+import org.apache.gobblin.util.ConfigUtils;
+import org.apache.gobblin.util.HostUtils;
+
+
+/**
+ * This class is a decorator for {@link MysqlMultiActiveLeaseArbiter} used to
model scenarios where a lease owner fails
+ * to complete a lease intermittently (representing a variety of slowness or
failure cases that can result on the
+ * participant side, network connectivity, or database).
+ *
+ * It will fail on calls to {@link
MysqlMultiActiveLeaseArbiter.recordLeaseSuccess()} where a function of the lease
+ * obtained timestamp matches a bitmask of the host. Ideally, each participant
should fail on different calls (with
+ * limited overlap if we want to test that). We use a deterministic method of
failing some calls to complete a lease
+ * success with the following methodology. We take the binary representation
of the lease obtained timestamp, scatter
+ * its bits through bit interleaving of the first and second halves of the
binary representation to differentiate
+ * behavior of consecutive timestamps, and compare the last N digits
(determined through config) to the bit mask of the
+ * host. If the bitwise AND comparison to the host bit mask equals the bitmask
we fail the call.
+ */
+@Slf4j
+public class MysqlMultiActiveLeaseArbiterTestingDecorator extends
MysqlMultiActiveLeaseArbiter {
+ private final int bitMaskLength;
+ private final int numHosts;
+ private final HashMap<Integer, Integer> hostIdToBitMask = new HashMap();
+
+ @Inject
+ public MysqlMultiActiveLeaseArbiterTestingDecorator(Config config) throws
IOException {
+ super(config);
+ bitMaskLength = ConfigUtils.getInt(config,
ConfigurationKeys.MULTI_ACTIVE_LEASE_ARBITER_BIT_MASK_LENGTH,
+ ConfigurationKeys.DEFAULT_MULTI_ACTIVE_LEASE_ARBITER_BIT_MASK_LENGTH);
+ numHosts = ConfigUtils.getInt(config,
ConfigurationKeys.MULTI_ACTIVE_LEASE_ARBITER_TESTING_DECORATOR_NUM_HOSTS,
+
ConfigurationKeys.DEFAULT_MULTI_ACTIVE_LEASE_ARBITER_TESTING_DECORATOR_NUM_HOSTS);
+ initializeHostToBitMaskMap(config);
+ }
+
+ /**
+ * Extract bit mask from input config if one is present. Otherwise set the
default bitmask for each host id which
+ * does not have overlapping bits between two hosts so that a given status
will not fail on multiple hosts.
+ * @param config expected to contain a mapping of host address to bitmap in
format
+ * "host1:bitMask1,host2:bitMask2,...,hostN:bitMaskN"
+ * Note: that if the mapping format is incorrect or there are fewer than
`bitMaskLength` mappings provide we utilize
+ * the default to prevent unintended consequences of
overlapping bit masks.
+ */
+ protected void initializeHostToBitMaskMap(Config config) {
+ // Set default bit masks for each hosts
+ // TODO: change this to parse default from Configuration.Keys property or
is that unnecessary?
+ hostIdToBitMask.put(1, 0b0001);
+ hostIdToBitMask.put(2, 0b0010);
+ hostIdToBitMask.put(3, 0b0100);
+ hostIdToBitMask.put(4, 0b1000);
+
+ // If a valid mapping is provided in config, then we overwrite all the
default values.
+ if
(config.hasPath(ConfigurationKeys.MULTI_ACTIVE_LEASE_ARBITER_HOST_TO_BIT_MASK_MAP))
{
+ String stringMap =
config.getString(ConfigurationKeys.MULTI_ACTIVE_LEASE_ARBITER_HOST_TO_BIT_MASK_MAP);
+ Optional<HashMap<InetAddress,Integer>> addressToBitMapOptional =
validateStringMap(stringMap, numHosts, bitMaskLength);
+ if (addressToBitMapOptional.isPresent()) {
+ for (InetAddress inetAddress : addressToBitMapOptional.get().keySet())
{
+ hostIdToBitMask.put(getHostIdFromAddress(inetAddress),
addressToBitMapOptional.get().get(inetAddress));
+ }
+ }
+ }
+ }
+
+ protected static Optional<HashMap<InetAddress,Integer>>
validateStringMap(String stringMap, int numHosts, int bitMaskLength) {
+ // TODO: Refactor to increase abstraction
+ String[] hostAddressToMap = stringMap.split(",");
+ if (hostAddressToMap.length < numHosts) {
+ log.warn("Host address to bit mask map expected to be in format "
+ + "`host1:bitMask1,host2:bitMask2,...,hostN:bitMaskN` with at least
" + numHosts + " hosts necessary. Using "
+ + "default.");
+ return Optional.absent();
+ }
+ HashMap<InetAddress,Integer> addressToBitmap = new HashMap<>();
+ for (String mapping : hostAddressToMap) {
+ String[] keyAndValue = mapping.split(":");
+ if (keyAndValue.length != 2) {
+ log.warn("Host address to bit mask map should be separated by `:`.
Expected format "
+ + "`host1:bitMask1,host2:bitMask2,...,hostN:bitMaskN`. Using
default.");
+ }
+ Optional<InetAddress> addressOptional =
HostUtils.getAddressForHostName(keyAndValue[0]);
+ if (!addressOptional.isPresent()) {
+ log.warn("Invalid hostname format in configuration. Using default.");
+ return Optional.absent();
+ }
+ if (!isValidBitMask(keyAndValue[1], bitMaskLength)) {
+ log.warn("Invalid bit mask format in configuration, expected to be " +
bitMaskLength + " digit binary number "
+ + "ie: `1010`. Using default.");
+ return Optional.absent();
+ }
+ addressToBitmap.put(addressOptional.get(),
Integer.valueOf(keyAndValue[1], 2));
+ }
+ return Optional.of(addressToBitmap);
+ }
+
+ protected static boolean isValidBitMask(String input, int bitMaskLength) {
+ // Check if the string contains only 0s and 1s
+ if (!input.matches("[01]+")) {
+ return false;
+ }
+ // Check if the string is exactly `bitMaskLength` characters long
+ if (input.length() != bitMaskLength) {
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * Retrieve the host id as a number between 1 through `numHosts` by using
the host address's hashcode.
+ * @return
+ */
+ protected int getHostIdFromAddress(InetAddress address) {
+ return (address.hashCode() % numHosts) + 1;
+ }
+
+ /**
+ * Returns bit mask for given host
+ * @param hostId
+ * @return
+ */
+ protected int getBitMaskForHostId(int hostId) {
+ return this.hostIdToBitMask.get(hostId);
+ }
+
+ /**
+ * Return bit mask for the current host
+ */
+ protected int getBitMaskForHost() throws UnknownHostException {
+ return
getBitMaskForHostId(getHostIdFromAddress(Inet6Address.getLocalHost()));
+ }
+
+ /**
+ * Apply a deterministic function to the input status to evaluate whether
this host should fail to complete a lease
+ * for testing purposes.
+ */
+ @Override
+ public boolean recordLeaseSuccess(LeaseObtainedStatus status) throws
IOException {
+ // Get host bit mask
+ int bitMask = getBitMaskForHost();
+ if (shouldFailLeaseCompletionAttempt(status, bitMask, bitMaskLength)) {
+ log.info("Multi-active lease arbiter lease attempt: [{}, eventTimestamp:
{}] - FAILED to complete in testing "
+ + "scenario");
+ return false;
+ } else {
+ return super.recordLeaseSuccess(status);
+ }
+ }
+
+ /**
+ * Applies bitmask to lease acquisition timestamp of a status parameter
provided to evaluate if the lease attempt to
+ * this host should fail
+ * @param status {@link
org.apache.gobblin.runtime.api.MultiActiveLeaseArbiter.LeaseObtainedStatus}
+ * @param bitmask 4-bit binary integer used to compare against modified
lease acquisition timestamp
+ * @return true if the host should fail the lease completion attempt
+ */
+ protected static boolean
shouldFailLeaseCompletionAttempt(LeaseObtainedStatus status, int bitmask,
+ int bitMaskLength) {
+ // Convert event timestamp to binary
+ Long.toString(status.getLeaseAcquisitionTimestamp()).getBytes();
+ String binaryString =
Long.toBinaryString(status.getLeaseAcquisitionTimestamp());
+ // Scatter binary bits
+ String scatteredBinaryString = scatterBinaryStringBits(binaryString);
+ // Take last `bitMaskLength`` bits of the string
+ int length = scatteredBinaryString.length();
+ String shortenedBinaryString =
scatteredBinaryString.substring(length-bitMaskLength, length);
Review Comment:
let's do binary entirely with numbers (no strings). e.g.:
```
boolean shouldFail = (scatterTimestamp(ts) & bitmaskBits) != 0
```
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