From b43e2ebfeb1a7c0d80ab99b12a5e81260b66c354 Mon Sep 17 00:00:00 2001 From: Sakthi Date: Wed, 20 Mar 2019 13:55:08 -0700 Subject: [PATCH] HBASE-21800: RegionServer aborted due to NPE from MetaTableMetrics coprocessor Have included code refactoring in MetaTableMetrics & LossyCounting --- .../hbase/coprocessor/MetaTableMetrics.java | 83 +++++++++---------- .../hadoop/hbase/util/LossyCounting.java | 21 ++--- .../hadoop/hbase/util/TestLossyCounting.java | 4 +- 3 files changed, 48 insertions(+), 60 deletions(-) diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MetaTableMetrics.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MetaTableMetrics.java index 571371e02fa5e649e8def92ad3dd2c63211f3af5..abef5aa8f55b712ba43d8c33e0b28ffa879b997e 100644 --- a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MetaTableMetrics.java +++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/MetaTableMetrics.java @@ -64,52 +64,42 @@ public class MetaTableMetrics extends BaseRegionObserver { .build(); @Override - public void preGetOp(ObserverContext e, Get get, - List results) throws IOException { - if (!active || !isMetaTableOp(e)) { - return; - } - tableMetricRegisterAndMark(e, get); - clientMetricRegisterAndMark(e); - regionMetricRegisterAndMark(e, get); - opMetricRegisterAndMark(e, get); - opWithClientMetricRegisterAndMark(e, get); + public void preGetOp(ObserverContext e, Get get, List results) + throws IOException { + registerAndMarkMetrics(e, get); } @Override public void prePut(ObserverContext 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 e, Delete delete, WALEdit edit, Durability durability) throws IOException { + registerAndMarkMetrics(e, delete); + } + + private void registerAndMarkMetrics(ObserverContext 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(); } } @@ -128,7 +118,7 @@ public class MetaTableMetrics extends BaseRegionObserver { /** * 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 @@ -192,6 +182,7 @@ public class MetaTableMetrics extends BaseRegionObserver { } private void clientMetricRegisterAndMark(ObserverContext e) { + // Mark client metric String clientIP = RpcServer.getRemoteIp() != null ? RpcServer.getRemoteIp().toString() : ""; String clientRequestMeter = clientRequestMeterName(clientIP); @@ -199,39 +190,43 @@ public class MetaTableMetrics extends BaseRegionObserver { markMeterIfPresent(clientRequestMeter); } - private void tableMetricRegisterAndMark(ObserverContext e, - Row op) { - // Mark the meta table meter whenever the coprocessor is called + private void tableMetricRegisterAndMark(ObserverContext e, Row op) { + // Mark table metric String tableName = getTableNameFromOp(op); String tableRequestMeter = tableMeterName(tableName); - registerMeterIfNotPresent(e, tableRequestMeter); - markMeterIfPresent(tableRequestMeter); + registerAndMarkMeterIfNotPresent(e, tableRequestMeter); } private void regionMetricRegisterAndMark(ObserverContext 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 e, - Row op) { + private void opMetricRegisterAndMark(ObserverContext 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 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 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 ""; @@ -274,10 +269,12 @@ public class MetaTableMetrics extends BaseRegionObserver { } 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 ""; } @@ -285,6 +282,7 @@ public class MetaTableMetrics extends BaseRegionObserver { } private String regionMeterName(String regionId) { + // Extract meter name containing the region ID return String.format("MetaTable_region_%s_request", regionId); } @@ -306,11 +304,10 @@ public class MetaTableMetrics extends BaseRegionObserver { 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); } } } - } diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/LossyCounting.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/LossyCounting.java index 2195da6d90007a664845ffbe240c17551d578a07..d526d881d45ab6a2f32fd6bdf766cc617a91ef1e 100644 --- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/LossyCounting.java +++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/LossyCounting.java @@ -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.hadoop.hbase.classification.InterfaceAudience; @@ -60,27 +59,19 @@ 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 addByOne(String key) { - if(data.containsKey(key)) { - data.put(key, data.get(key) +1); - } else { - data.put(key, 1); + if (!data.containsKey(key)) { + data.put(key, 0); } + data.put(key, data.get(key) + 1); totalDataCount++; calculateCurrentTerm(); Set dataToBeSwept = new HashSet<>(); @@ -104,7 +95,7 @@ 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; } @@ -115,7 +106,7 @@ public class LossyCounting { this.currentTerm = (int) Math.ceil(1.0 * totalDataCount / bucketSize); } - public long getBuketSize(){ + public long getBucketSize(){ return bucketSize; } diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestLossyCounting.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestLossyCounting.java index 71945fce2c40ffac20228129a8c80f2e087d67e6..edef0bbd0268e00b9b4c1f48eb9db82e491680e3 100644 --- a/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestLossyCounting.java +++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestLossyCounting.java @@ -34,9 +34,9 @@ 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 -- 2.17.2 (Apple Git-113)