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Add more debugging/error messages when mlockall fails

This commit is contained in:
Robert Muir 2015-05-30 11:17:16 -04:00
parent d99b5dfdb4
commit 1020b321ce
2 changed files with 53 additions and 15 deletions
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32
src/main/java/org/elasticsearch/bootstrap/JNACLibrary.java
View File

@ -20,27 +20,32 @@
package org.elasticsearch.bootstrap;
import com.sun.jna.Native;
import com.sun.jna.Structure;
import org.apache.lucene.util.Constants;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import java.util.Arrays;
import java.util.List;
/**
*
*/
class JNACLibrary {
final class JNACLibrary {
private static final ESLogger logger = Loggers.getLogger(JNACLibrary.class);
public static final int MCL_CURRENT = 1;
public static final int MCL_FUTURE = 2;
public static final int ENOMEM = 12;
public static final int RLIMIT_MEMLOCK = Constants.MAC_OS_X ? 6 : 8;
static {
try {
Native.register("c");
} catch (UnsatisfiedLinkError e) {
logger.warn("unable to link C library. native methods (mlockall) will be disabled.");
logger.warn("unable to link C library. native methods (mlockall) will be disabled.", e);
}
}
@ -48,6 +53,25 @@ class JNACLibrary {
static native int geteuid();
/** corresponds to struct rlimit */
public static final class Rlimit extends Structure implements Structure.ByReference {
public long rlim_cur = 0;
public long rlim_max = 0;
@Override
protected List getFieldOrder() {
return Arrays.asList(new String[] { "rlim_cur", "rlim_max" });
}
}
static native int getrlimit(int resource, Rlimit rlimit);
static native String strerror(int errno);
private JNACLibrary() {
}
public static void main(String args[]) throws Exception {
JNANatives.tryMlockall();
}
}

36
src/main/java/org/elasticsearch/bootstrap/JNANatives.java
View File

@ -43,26 +43,40 @@ class JNANatives {
static void tryMlockall() {
int errno = Integer.MIN_VALUE;
String errMsg = null;
boolean rlimitSuccess = false;
long softLimit = 0;
long hardLimit = 0;
try {
int result = JNACLibrary.mlockall(JNACLibrary.MCL_CURRENT);
if (result != 0) {
errno = Native.getLastError();
} else {
if (result == 0) {
LOCAL_MLOCKALL = true;
return;
}
errno = Native.getLastError();
errMsg = JNACLibrary.strerror(errno);
JNACLibrary.Rlimit rlimit = new JNACLibrary.Rlimit();
if (JNACLibrary.getrlimit(JNACLibrary.RLIMIT_MEMLOCK, rlimit) == 0) {
rlimitSuccess = true;
softLimit = rlimit.rlim_cur;
hardLimit = rlimit.rlim_max;
} else {
logger.warn("Unable to retrieve resource limits: " + JNACLibrary.strerror(Native.getLastError()));
}
} catch (UnsatisfiedLinkError e) {
// this will have already been logged by CLibrary, no need to repeat it
return;
}
if (errno != Integer.MIN_VALUE) {
if (errno == JNACLibrary.ENOMEM && System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("linux")) {
logger.warn("Unable to lock JVM memory (ENOMEM)."
+ " This can result in part of the JVM being swapped out."
+ " Increase RLIMIT_MEMLOCK (ulimit).");
} else if (!System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("mac")) {
// OS X allows mlockall to be called, but always returns an error
logger.warn("Unknown mlockall error " + errno);
// mlockall failed for some reason
logger.warn("Unable to lock JVM Memory: error=" + errno + ",reason=" + errMsg + ". This can result in part of the JVM being swapped out");
if (errno == JNACLibrary.ENOMEM) {
if (rlimitSuccess) {
logger.warn("Increase RLIMIT_MEMLOCK (ulimit). soft limit:" + softLimit + ", hard limit:" + hardLimit);
} else {
logger.warn("Increase RLIMIT_MEMLOCK (ulimit).");
}
}
}