Cleanup Javadocs in BootstrapCheck.java
This commit cleans up the formatting of some Javadocs in BootstrapCheck.java, and corrects some docs that had become stale as the bootstrap checks evolved.
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@ -48,11 +48,8 @@ import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* We enforce limits once any network host is configured. In this case we assume the node is running in production
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* and all production limit checks must pass. This should be extended as we go to settings like:
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* - discovery.zen.ping.unicast.hosts is set if we use zen disco
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* - ensure we can write in all data directories
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* - fail if the default cluster.name is used, if this is setup on network a real clustername should be used?
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* We enforce bootstrap checks once a node has the transport protocol bound to a non-loopback interface. In this case we assume the node is
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* running in production and all bootstrap checks must pass.
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*/
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final class BootstrapCheck {
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@ -60,8 +57,7 @@ final class BootstrapCheck {
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}
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/**
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* checks the current limits against the snapshot or release build
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* checks
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* Executes the bootstrap checks if the node has the transport protocol bound to a non-loopback interface.
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*
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* @param settings the current node settings
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* @param boundTransportAddress the node network bindings
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@ -74,15 +70,12 @@ final class BootstrapCheck {
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}
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/**
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* executes the provided checks and fails the node if
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* enforceLimits is true, otherwise logs warnings
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* Executes the provided checks and fails the node if {@code enforceLimits} is {@code true}, otherwise logs warnings.
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*
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* @param enforceLimits true if the checks should be enforced or
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* otherwise warned
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* @param checks the checks to execute
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* @param nodeName the node name to be used as a logging prefix
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* @param enforceLimits {@code true} if the checks should be enforced or otherwise warned
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* @param checks the checks to execute
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* @param nodeName the node name to be used as a logging prefix
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*/
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// visible for testing
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static void check(
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final boolean enforceLimits,
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final List<Check> checks,
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@ -91,13 +84,11 @@ final class BootstrapCheck {
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}
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/**
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* executes the provided checks and fails the node if
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* enforceLimits is true, otherwise logs warnings
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* Executes the provided checks and fails the node if {@code enforceLimits} is {@code true}, otherwise logs warnings.
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*
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* @param enforceLimits true if the checks should be enforced or
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* otherwise warned
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* @param checks the checks to execute
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* @param logger the logger to
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* @param enforceLimits {@code true} if the checks should be enforced or otherwise warned
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* @param checks the checks to execute
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* @param logger the logger to
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*/
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static void check(
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final boolean enforceLimits,
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@ -140,12 +131,11 @@ final class BootstrapCheck {
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}
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/**
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* Tests if the checks should be enforced
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* Tests if the checks should be enforced.
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*
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* @param boundTransportAddress the node network bindings
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* @return true if the checks should be enforced
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* @return {@code true} if the checks should be enforced
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*/
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// visible for testing
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static boolean enforceLimits(BoundTransportAddress boundTransportAddress) {
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Predicate<TransportAddress> isLoopbackOrLinkLocalAddress = t -> t.address().getAddress().isLinkLocalAddress()
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|| t.address().getAddress().isLoopbackAddress();
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@ -179,19 +169,19 @@ final class BootstrapCheck {
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}
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/**
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* Encapsulates a limit check
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* Encapsulates a bootstrap check.
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*/
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interface Check {
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/**
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* test if the node fails the check
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* Test if the node fails the check.
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*
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* @return true if the node failed the check
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* @return {@code true} if the node failed the check
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*/
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boolean check();
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/**
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* the message for a failed check
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* The error message for a failed check.
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*
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* @return the error message on check failure
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*/
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@ -561,38 +551,58 @@ final class BootstrapCheck {
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public boolean check() {
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if ("Oracle Corporation".equals(jvmVendor()) && isJava8() && isG1GCEnabled()) {
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final String jvmVersion = jvmVersion();
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// HotSpot versions on Java 8 match this regular expression; note that this changes with Java 9 after JEP-223
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final Pattern pattern = Pattern.compile("(\\d+)\\.(\\d+)-b\\d+");
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final Matcher matcher = pattern.matcher(jvmVersion);
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final boolean matches = matcher.matches();
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assert matches : jvmVersion;
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final int major = Integer.parseInt(matcher.group(1));
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final int update = Integer.parseInt(matcher.group(2));
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// HotSpot versions for Java 8 have major version 25, the bad versions are all versions prior to update 40
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return major == 25 && update < 40;
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} else {
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return false;
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}
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}
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// visible for testing
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/**
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* Returns the JVM vendor as the G1GC check only applies to Oracle/OpenJDK JVMs that have "Oracle Corporation" as the vendor.
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*
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* @return the JVM vendor
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*/
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String jvmVendor() {
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return Constants.JVM_VENDOR;
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}
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// visible for testing
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/**
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* Whether or not G1GC is enabled. This method should only be invoked when the JVM vendor is "Oracle Corporation".
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*
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* @return whether or not G1GC is enabled
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*/
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boolean isG1GCEnabled() {
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assert "Oracle Corporation".equals(jvmVendor());
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return JvmInfo.jvmInfo().useG1GC().equals("true");
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}
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// visible for testing
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/**
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* The JVM version from the system property "java.vm.version". This method should only be invoked when the JVM vendor is
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* "Oracle Corporation".
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*
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* @return the JVM version
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*/
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String jvmVersion() {
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assert "Oracle Corporation".equals(jvmVendor());
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return Constants.JVM_VERSION;
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}
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// visible for tests
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/**
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* Whether or not the Java version is Java 8. This method should only be invoked when the JVM vendor is "Oracle Corporation".
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*
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* @return whether or not the Java version is Java 8.
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*/
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boolean isJava8() {
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return Constants.JVM_SPEC_VERSION.equals("1.8");
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assert "Oracle Corporation".equals(jvmVendor());
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return JavaVersion.current().equals(JavaVersion.parse("1.8"));
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}
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@Override
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@ -592,12 +592,15 @@ public class BootstrapCheckTests extends ESTestCase {
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BootstrapCheck.check(true, Collections.singletonList(nonOracleCheck), "testG1GCCheck");
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final BootstrapCheck.G1GCCheck nonJava8Check = new BootstrapCheck.G1GCCheck() {
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@Override
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boolean isJava8() {
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return false;
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}
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};
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// if not java 8, nothing should happen
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// if not Java 8, nothing should happen
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BootstrapCheck.check(true, Collections.singletonList(nonJava8Check), "testG1GCCheck");
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}
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