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HBASE-21800: RegionServer aborted due to NPE from MetaTableMetrics coprocessor 

Have included code refactoring in MetaTableMetrics & LossyCounting

Signed-off-by: Xu Cang <xucang@apache.org>
This commit is contained in:
Sakthi 2019-01-29 11:20:45 -08:00 committed by Xu Cang
parent e30755bf15
commit 40ac6ac1e6
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GPG Key ID: 8E6C8FEDCA866394
4 changed files with 44 additions and 62 deletions
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78
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MetaTableMetrics.java
View File

@ -75,50 +75,40 @@ public class MetaTableMetrics implements RegionCoprocessor {
@Override
public void preGetOp(ObserverContext<RegionCoprocessorEnvironment> e, Get get,
List<Cell> results) throws IOException {
if (!active || !isMetaTableOp(e)) {
return;
}
tableMetricRegisterAndMark(e, get);
clientMetricRegisterAndMark(e);
regionMetricRegisterAndMark(e, get);
opMetricRegisterAndMark(e, get);
opWithClientMetricRegisterAndMark(e, get);
registerAndMarkMetrics(e, get);
}
@Override
public void prePut(ObserverContext<RegionCoprocessorEnvironment> e, Put put, WALEdit edit,
Durability durability) throws IOException {
if (!active || !isMetaTableOp(e)) {
return;
}
tableMetricRegisterAndMark(e, put);
clientMetricRegisterAndMark(e);
regionMetricRegisterAndMark(e, put);
opMetricRegisterAndMark(e, put);
opWithClientMetricRegisterAndMark(e, put);
registerAndMarkMetrics(e, put);
}
@Override
public void preDelete(ObserverContext<RegionCoprocessorEnvironment> e, Delete delete,
WALEdit edit, Durability durability) throws IOException {
registerAndMarkMetrics(e, delete);
}
private void registerAndMarkMetrics(ObserverContext<RegionCoprocessorEnvironment> e, Row row){
if (!active || !isMetaTableOp(e)) {
return;
}
tableMetricRegisterAndMark(e, delete);
tableMetricRegisterAndMark(e, row);
clientMetricRegisterAndMark(e);
regionMetricRegisterAndMark(e, delete);
opMetricRegisterAndMark(e, delete);
opWithClientMetricRegisterAndMark(e, delete);
regionMetricRegisterAndMark(e, row);
opMetricRegisterAndMark(e, row);
opWithClientMetricRegisterAndMark(e, row);
}
private void markMeterIfPresent(String requestMeter) {
if (requestMeter.isEmpty()) {
return;
}
Metric metric =
requestsMap.get(requestMeter).isPresent() ? requestsMap.get(requestMeter).get() : null;
if (metric != null) {
((Meter) metric).mark();
if (requestsMap.containsKey(requestMeter) && requestsMap.get(requestMeter).isPresent()) {
Meter metric = (Meter) requestsMap.get(requestMeter).get();
metric.mark();
}
}
@ -137,7 +127,7 @@ public class MetaTableMetrics implements RegionCoprocessor {
/**
* Registers and counts lossyCount for Meters that kept by lossy counting.
* By using lossy count to maintain meters, at most 7 / e meters will be kept (e is error rate)
* e.g. when e is 0.02 by default, at most 50 Clients request metrics will be kept
* e.g. when e is 0.02 by default, at most 350 Clients request metrics will be kept
* also, all kept elements have frequency higher than e * N. (N is total count)
* @param e Region coprocessor environment
* @param requestMeter meter to be registered
@ -202,6 +192,7 @@ public class MetaTableMetrics implements RegionCoprocessor {
}
private void clientMetricRegisterAndMark(ObserverContext<RegionCoprocessorEnvironment> e) {
// Mark client metric
String clientIP = RpcServer.getRemoteIp() != null ? RpcServer.getRemoteIp().toString() : "";
String clientRequestMeter = clientRequestMeterName(clientIP);
@ -211,37 +202,43 @@ public class MetaTableMetrics implements RegionCoprocessor {
private void tableMetricRegisterAndMark(ObserverContext<RegionCoprocessorEnvironment> e,
Row op) {
// Mark the meta table meter whenever the coprocessor is called
// Mark table metric
String tableName = getTableNameFromOp(op);
String tableRequestMeter = tableMeterName(tableName);
registerMeterIfNotPresent(e, tableRequestMeter);
markMeterIfPresent(tableRequestMeter);
registerAndMarkMeterIfNotPresent(e, tableRequestMeter);
}
private void regionMetricRegisterAndMark(ObserverContext<RegionCoprocessorEnvironment> e,
Row op) {
// Mark the meta table meter whenever the coprocessor is called
// Mark region metric
String regionId = getRegionIdFromOp(op);
String regionRequestMeter = regionMeterName(regionId);
registerMeterIfNotPresent(e, regionRequestMeter);
markMeterIfPresent(regionRequestMeter);
registerAndMarkMeterIfNotPresent(e, regionRequestMeter);
}
private void opMetricRegisterAndMark(ObserverContext<RegionCoprocessorEnvironment> e,
Row op) {
// Mark access type ["get", "put", "delete"] metric
String opMeterName = opMeterName(op);
registerMeterIfNotPresent(e, opMeterName);
markMeterIfPresent(opMeterName);
registerAndMarkMeterIfNotPresent(e, opMeterName);
}
private void opWithClientMetricRegisterAndMark(ObserverContext<RegionCoprocessorEnvironment> e,
Object op) {
// // Mark client + access type metric
String opWithClientMeterName = opWithClientMeterName(op);
registerMeterIfNotPresent(e, opWithClientMeterName);
markMeterIfPresent(opWithClientMeterName);
registerAndMarkMeterIfNotPresent(e, opWithClientMeterName);
}
// Helper function to register and mark meter if not present
private void registerAndMarkMeterIfNotPresent(ObserverContext<RegionCoprocessorEnvironment> e,
String name) {
registerMeterIfNotPresent(e, name);
markMeterIfPresent(name);
}
private String opWithClientMeterName(Object op) {
// Extract meter name containing the client IP
String clientIP = RpcServer.getRemoteIp() != null ? RpcServer.getRemoteIp().toString() : "";
if (clientIP.isEmpty()) {
return "";
@ -265,6 +262,7 @@ public class MetaTableMetrics implements RegionCoprocessor {
}
private String opMeterName(Object op) {
// Extract meter name containing the access type
MetaTableOps ops = opsNameMap.get(op.getClass());
String opMeterName = "";
switch (ops) {
@ -284,10 +282,12 @@ public class MetaTableMetrics implements RegionCoprocessor {
}
private String tableMeterName(String tableName) {
// Extract meter name containing the table name
return String.format("MetaTable_table_%s_request", tableName);
}
private String clientRequestMeterName(String clientIP) {
// Extract meter name containing the client IP
if (clientIP.isEmpty()) {
return "";
}
@ -295,6 +295,7 @@ public class MetaTableMetrics implements RegionCoprocessor {
}
private String regionMeterName(String regionId) {
// Extract meter name containing the region ID
return String.format("MetaTable_region_%s_request", regionId);
}
}
@ -306,18 +307,16 @@ public class MetaTableMetrics implements RegionCoprocessor {
@Override
public void start(CoprocessorEnvironment env) throws IOException {
observer = new ExampleRegionObserverMeta();
if (env instanceof RegionCoprocessorEnvironment
&& ((RegionCoprocessorEnvironment) env).getRegionInfo().getTable() != null
&& ((RegionCoprocessorEnvironment) env).getRegionInfo().getTable()
.equals(TableName.META_TABLE_NAME)) {
regionCoprocessorEnv = (RegionCoprocessorEnvironment) env;
observer = new ExampleRegionObserverMeta();
requestsMap = new ConcurrentHashMap<>();
clientMetricsLossyCounting = new LossyCounting();
// only be active mode when this region holds meta table.
active = true;
} else {
observer = new ExampleRegionObserverMeta();
}
}
@ -325,11 +324,10 @@ public class MetaTableMetrics implements RegionCoprocessor {
public void stop(CoprocessorEnvironment env) throws IOException {
// since meta region can move around, clear stale metrics when stop.
if (requestsMap != null) {
MetricRegistry registry = regionCoprocessorEnv.getMetricRegistryForRegionServer();
for (String meterName : requestsMap.keySet()) {
MetricRegistry registry = regionCoprocessorEnv.getMetricRegistryForRegionServer();
registry.remove(meterName);
}
}
}
}

20
hbase-server/src/main/java/org/apache/hadoop/hbase/util/LossyCounting.java
View File

@ -24,7 +24,6 @@ import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.yetus.audience.InterfaceAudience;
@ -61,27 +60,16 @@ public class LossyCounting {
this.bucketSize = (long) Math.ceil(1 / errorRate);
this.currentTerm = 1;
this.totalDataCount = 0;
this.errorRate = errorRate;
this.data = new ConcurrentHashMap<>();
calculateCurrentTerm();
}
public LossyCounting() {
Configuration conf = HBaseConfiguration.create();
this.errorRate = conf.getDouble(HConstants.DEFAULT_LOSSY_COUNTING_ERROR_RATE, 0.02);
this.bucketSize = (long) Math.ceil(1.0 / errorRate);
this.currentTerm = 1;
this.totalDataCount = 0;
this.data = new ConcurrentHashMap<>();
calculateCurrentTerm();
this(HBaseConfiguration.create().getDouble(HConstants.DEFAULT_LOSSY_COUNTING_ERROR_RATE, 0.02));
}
public Set<String> addByOne(String key) {
if(data.containsKey(key)) {
data.put(key, data.get(key) +1);
} else {
data.put(key, 1);
}
data.put(key, data.getOrDefault(key, 0) + 1);
totalDataCount++;
calculateCurrentTerm();
Set<String> dataToBeSwept = new HashSet<>();
@ -105,7 +93,7 @@ public class LossyCounting {
for(String key : dataToBeSwept) {
data.remove(key);
}
LOG.debug(String.format("Swept %d of elements.", dataToBeSwept.size()));
LOG.debug(String.format("Swept %d elements.", dataToBeSwept.size()));
return dataToBeSwept;
}
@ -116,7 +104,7 @@ public class LossyCounting {
this.currentTerm = (int) Math.ceil(1.0 * totalDataCount / bucketSize);
}
public long getBuketSize(){
public long getBucketSize(){
return bucketSize;
}

4
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestMetaTableMetrics.java
View File

@ -222,10 +222,6 @@ public class TestMetaTableMetrics {
jmxMetrics.stream().filter(metric -> metric.matches(putWithClientMetricNameRegex))
.count();
assertEquals(5L, putWithClientMetricsCount);
}
}

4
hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestLossyCounting.java
View File

@ -39,9 +39,9 @@ public class TestLossyCounting {
@Test
public void testBucketSize() {
LossyCounting lossyCounting = new LossyCounting(0.01);
assertEquals(100L, lossyCounting.getBuketSize());
assertEquals(100L, lossyCounting.getBucketSize());
LossyCounting lossyCounting2 = new LossyCounting();
assertEquals(50L, lossyCounting2.getBuketSize());
assertEquals(50L, lossyCounting2.getBucketSize());
}
@Test