From 8a314267990a1b5c5c5c61ff533376577d9bcb94 Mon Sep 17 00:00:00 2001 From: Sakthi Date: Tue, 29 Jan 2019 00:59:14 -0800 Subject: [PATCH] HBASE-21800: RegionServer aborted due to NPE from MetaTableMetrics coprocessor Have included code refactoring in MetaTableMetrics & LossyCounting --- .../hbase/coprocessor/MetaTableMetrics.java | 77 +++++++++---------- .../hadoop/hbase/util/LossyCounting.java | 20 ++--- .../coprocessor/TestMetaTableMetrics.java | 4 - .../hadoop/hbase/util/TestLossyCounting.java | 4 +- 4 files changed, 44 insertions(+), 61 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 3bb47ae062c1a3467423012e525007a4ef5b214a..2f863145bb6f03f6ef02d4c12a9d6852d728409f 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 @@ -75,50 +75,39 @@ public class MetaTableMetrics implements RegionCoprocessor { @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); + 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(); } } @@ -137,7 +126,7 @@ 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 +191,7 @@ public class MetaTableMetrics implements RegionCoprocessor { } private void clientMetricRegisterAndMark(ObserverContext e) { + // Mark client metric String clientIP = RpcServer.getRemoteIp() != null ? RpcServer.getRemoteIp().toString() : ""; String clientRequestMeter = clientRequestMeterName(clientIP); @@ -211,37 +201,43 @@ public class MetaTableMetrics implements RegionCoprocessor { private void tableMetricRegisterAndMark(ObserverContext 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 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) { + // 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 ""; @@ -265,6 +261,7 @@ 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 +281,12 @@ 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 +294,7 @@ 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 +306,16 @@ 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 +323,10 @@ 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); } } } - } 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 c0da303f750ef3d423702d2410ac0bb84e0530bc..45d0b70a5e9dc1ee225644e79e36324218406f11 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 @@ -58,30 +58,20 @@ public class LossyCounting { if (errorRate < 0.0 || errorRate > 1.0) { throw new IllegalArgumentException(" Lossy Counting error rate should be within range [0,1]"); } + LOG.debug("LossyCounting error rate: " + errorRate); 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); - } + data.put(key, data.getOrDefault(key, 0) + 1); totalDataCount++; calculateCurrentTerm(); Set dataToBeSwept = new HashSet<>(); @@ -105,7 +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; } @@ -116,7 +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/coprocessor/TestMetaTableMetrics.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestMetaTableMetrics.java index 7c1c242a14687df277b6de6e374d180972c01403..bbbeb9e5273d6e474a41f455bf3ff98951f0cca9 100644 --- a/hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestMetaTableMetrics.java +++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestMetaTableMetrics.java @@ -222,10 +222,6 @@ public class TestMetaTableMetrics { jmxMetrics.stream().filter(metric -> metric.matches(putWithClientMetricNameRegex)) .count(); assertEquals(5L, putWithClientMetricsCount); - - - - } } 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 a36574009084c01793c07c414e928776a075cdb7..11758be7f5e1c765d130ff0ca84477b0cf93727b 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 @@ -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 -- 2.17.2 (Apple Git-113)