Apache
/
hbase
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

HBASE-21401 Sanity check in BaseDecoder#parseCell

This commit is contained in:
huzheng 2018-10-27 16:57:01 +08:00
parent cf9b515563
commit f17382792f
7 changed files with 286 additions and 181 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
hbase-common/src/main/java/org/apache/hadoop/hbase/KeyValue.java
View File

@ -251,6 +251,15 @@ public class KeyValue implements ExtendedCell, Cloneable {
}
}
/**
* True to indicate that the byte b is a valid type.
* @param b byte to check
* @return true or false
*/
static boolean isValidType(byte b) {
return codeArray[b & 0xff] != null;
}
/**
* Cannot rely on enum ordinals . They change if item is removed or moved.
* Do our own codes.

149
hbase-common/src/main/java/org/apache/hadoop/hbase/KeyValueUtil.java
View File

@ -518,17 +518,145 @@ public class KeyValueUtil {
return (long) length + Bytes.SIZEOF_INT;
}
static String bytesToHex(byte[] buf, int offset, int length) {
return ", KeyValueBytesHex=" + Bytes.toStringBinary(buf, offset, length) + ", offset=" + offset
+ ", length=" + length;
}
private static void checkKeyValueBytes(byte[] buf, int offset, int length, boolean withTags)
throws IOException {
int pos = offset, endOffset = offset + length;
// check the key
if (pos + Bytes.SIZEOF_INT > endOffset) {
throw new IOException(
"Overflow when reading key length at position=" + pos + bytesToHex(buf, offset, length));
}
int keyLen = Bytes.toInt(buf, pos, Bytes.SIZEOF_INT);
pos += Bytes.SIZEOF_INT;
if (keyLen <= 0 || pos + keyLen > endOffset) {
throw new IOException(
"Invalid key length in KeyValue. keyLength=" + keyLen + bytesToHex(buf, offset, length));
}
// check the value
if (pos + Bytes.SIZEOF_INT > endOffset) {
throw new IOException("Overflow when reading value length at position=" + pos
+ bytesToHex(buf, offset, length));
}
int valLen = Bytes.toInt(buf, pos, Bytes.SIZEOF_INT);
pos += Bytes.SIZEOF_INT;
if (valLen < 0 || pos + valLen > endOffset) {
throw new IOException("Invalid value length in KeyValue, valueLength=" + valLen
+ bytesToHex(buf, offset, length));
}
// check the row
if (pos + Bytes.SIZEOF_SHORT > endOffset) {
throw new IOException(
"Overflow when reading row length at position=" + pos + bytesToHex(buf, offset, length));
}
short rowLen = Bytes.toShort(buf, pos, Bytes.SIZEOF_SHORT);
pos += Bytes.SIZEOF_SHORT;
if (rowLen < 0 || pos + rowLen > endOffset) {
throw new IOException(
"Invalid row length in KeyValue, rowLength=" + rowLen + bytesToHex(buf, offset, length));
}
pos += rowLen;
// check the family
if (pos + Bytes.SIZEOF_BYTE > endOffset) {
throw new IOException("Overflow when reading family length at position=" + pos
+ bytesToHex(buf, offset, length));
}
int familyLen = buf[pos];
pos += Bytes.SIZEOF_BYTE;
if (familyLen < 0 || pos + familyLen > endOffset) {
throw new IOException("Invalid family length in KeyValue, familyLength=" + familyLen
+ bytesToHex(buf, offset, length));
}
pos += familyLen;
// check the qualifier
int qualifierLen = keyLen - Bytes.SIZEOF_SHORT - rowLen - Bytes.SIZEOF_BYTE - familyLen
- Bytes.SIZEOF_LONG - Bytes.SIZEOF_BYTE;
if (qualifierLen < 0 || pos + qualifierLen > endOffset) {
throw new IOException("Invalid qualifier length in KeyValue, qualifierLen=" + qualifierLen
+ bytesToHex(buf, offset, length));
}
pos += qualifierLen;
// check the timestamp
if (pos + Bytes.SIZEOF_LONG > endOffset) {
throw new IOException(
"Overflow when reading timestamp at position=" + pos + bytesToHex(buf, offset, length));
}
long timestamp = Bytes.toLong(buf, pos, Bytes.SIZEOF_LONG);
if (timestamp < 0) {
throw new IOException(
"Timestamp cannot be negative, ts=" + timestamp + bytesToHex(buf, offset, length));
}
pos += Bytes.SIZEOF_LONG;
// check the type
if (pos + Bytes.SIZEOF_BYTE > endOffset) {
throw new IOException(
"Overflow when reading type at position=" + pos + bytesToHex(buf, offset, length));
}
byte type = buf[pos];
if (!Type.isValidType(type)) {
throw new IOException(
"Invalid type in KeyValue, type=" + type + bytesToHex(buf, offset, length));
}
pos += Bytes.SIZEOF_BYTE;
// check the value
if (pos + valLen > endOffset) {
throw new IOException(
"Overflow when reading value part at position=" + pos + bytesToHex(buf, offset, length));
}
pos += valLen;
// check the tags
if (withTags) {
if (pos == endOffset) {
// withTags is true but no tag in the cell.
return;
}
if (pos + Bytes.SIZEOF_SHORT > endOffset) {
throw new IOException("Overflow when reading tags length at position=" + pos
+ bytesToHex(buf, offset, length));
}
short tagsLen = Bytes.toShort(buf, pos);
pos += Bytes.SIZEOF_SHORT;
if (tagsLen < 0 || pos + tagsLen > endOffset) {
throw new IOException("Invalid tags length in KeyValue at position="
+ (pos - Bytes.SIZEOF_SHORT) + bytesToHex(buf, offset, length));
}
int tagsEndOffset = pos + tagsLen;
for (; pos < tagsEndOffset;) {
if (pos + Tag.TAG_LENGTH_SIZE > endOffset) {
throw new IOException("Overflow when reading tag length at position=" + pos
+ bytesToHex(buf, offset, length));
}
short tagLen = Bytes.toShort(buf, pos);
pos += Tag.TAG_LENGTH_SIZE;
// tagLen contains one byte tag type, so must be not less than 1.
if (tagLen < 1 || pos + tagLen > endOffset) {
throw new IOException("Invalid tag length at position=" + (pos - Tag.TAG_LENGTH_SIZE)
+ ", tagLength=" + tagLen + bytesToHex(buf, offset, length));
}
pos += tagLen;
}
}
if (pos != endOffset) {
throw new IOException("Some redundant bytes in KeyValue's buffer, startOffset=" + pos
+ ", endOffset=" + endOffset + bytesToHex(buf, offset, length));
}
}
/**
* Create a KeyValue reading from the raw InputStream. Named
* <code>iscreate</code> so doesn't clash with {@link #create(DataInput)}
*
* @param in
* <code>createKeyValueFromInputStream</code> so doesn't clash with {@link #create(DataInput)}
* @param in inputStream to read.
* @param withTags whether the keyvalue should include tags are not
* @return Created KeyValue OR if we find a length of zero, we will return
* null which can be useful marking a stream as done.
* @return Created KeyValue OR if we find a length of zero, we will return null which can be
* useful marking a stream as done.
* @throws IOException
*/
public static KeyValue iscreate(final InputStream in, boolean withTags) throws IOException {
public static KeyValue createKeyValueFromInputStream(InputStream in, boolean withTags)
throws IOException {
byte[] intBytes = new byte[Bytes.SIZEOF_INT];
int bytesRead = 0;
while (bytesRead < intBytes.length) {
@ -541,14 +669,11 @@ public class KeyValueUtil {
}
bytesRead += n;
}
// TODO: perhaps some sanity check is needed here.
byte[] bytes = new byte[Bytes.toInt(intBytes)];
IOUtils.readFully(in, bytes, 0, bytes.length);
if (withTags) {
return new KeyValue(bytes, 0, bytes.length);
} else {
return new NoTagsKeyValue(bytes, 0, bytes.length);
}
checkKeyValueBytes(bytes, 0, bytes.length, withTags);
return withTags ? new KeyValue(bytes, 0, bytes.length)
: new NoTagsKeyValue(bytes, 0, bytes.length);
}
/**

3
hbase-common/src/main/java/org/apache/hadoop/hbase/codec/KeyValueCodec.java
View File

@ -72,7 +72,7 @@ public class KeyValueCodec implements Codec {
@Override
protected Cell parseCell() throws IOException {
// No tags here
return KeyValueUtil.iscreate(in, false);
return KeyValueUtil.createKeyValueFromInputStream(in, false);
}
}
@ -114,7 +114,6 @@ public class KeyValueCodec implements Codec {
// We know there is not going to be any tags.
return new NoTagsByteBufferKeyValue(bb, pos, len);
}
}
/**

2
hbase-common/src/main/java/org/apache/hadoop/hbase/codec/KeyValueCodecWithTags.java
View File

@ -78,7 +78,7 @@ public class KeyValueCodecWithTags implements Codec {
@Override
protected Cell parseCell() throws IOException {
// create KeyValue with tags
return KeyValueUtil.iscreate(in, true);
return KeyValueUtil.createKeyValueFromInputStream(in, true);
}
}

2
hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/RowIndexSeekerV1.java
View File

@ -356,7 +356,7 @@ public class RowIndexSeekerV1 extends AbstractEncodedSeeker {
protected int getCellBufSize() {
int kvBufSize = KEY_VALUE_LEN_SIZE + keyLength + valueLength;
if (includesTags()) {
if (includesTags() && tagsLength > 0) {
kvBufSize += Bytes.SIZEOF_SHORT + tagsLength;
}
return kvBufSize;

301
hbase-common/src/test/java/org/apache/hadoop/hbase/TestKeyValue.java
View File

@ -18,11 +18,13 @@
*/
package org.apache.hadoop.hbase;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
@ -590,181 +592,152 @@ public class TestKeyValue {
@Test
public void testKeyValueSerialization() throws Exception {
KeyValue kvA1 = new KeyValue(Bytes.toBytes("key"), Bytes.toBytes("cf"), Bytes.toBytes("qualA"),
Bytes.toBytes("1"));
KeyValue kvA2 = new KeyValue(Bytes.toBytes("key"), Bytes.toBytes("cf"), Bytes.toBytes("qualA"),
Bytes.toBytes("2"));
MockKeyValue mkvA1 = new MockKeyValue(kvA1);
MockKeyValue mkvA2 = new MockKeyValue(kvA2);
KeyValue[] keyValues = new KeyValue[] {
new KeyValue(Bytes.toBytes("key"), Bytes.toBytes("cf"), Bytes.toBytes("qualA"),
Bytes.toBytes("1")),
new KeyValue(Bytes.toBytes("key"), Bytes.toBytes("cf"), Bytes.toBytes("qualA"),
Bytes.toBytes("2")),
new KeyValue(Bytes.toBytes("key"), Bytes.toBytes("cf"), Bytes.toBytes("qualA"),
System.currentTimeMillis(), Bytes.toBytes("2"),
new Tag[] { new ArrayBackedTag((byte) 120, "tagA"),
new ArrayBackedTag((byte) 121, Bytes.toBytes("tagB")) }),
new KeyValue(Bytes.toBytes("key"), Bytes.toBytes("cf"), Bytes.toBytes("qualA"),
System.currentTimeMillis(), Bytes.toBytes("2"),
new Tag[] { new ArrayBackedTag((byte) 0, "tagA") }),
new KeyValue(Bytes.toBytes("key"), Bytes.toBytes("cf"), Bytes.toBytes(""),
Bytes.toBytes("1")) };
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
DataOutputStream os = new DataOutputStream(byteArrayOutputStream);
ByteBufferUtils.putInt(os, KeyValueUtil.getSerializedSize(mkvA1, true));
KeyValueUtil.oswrite(mkvA1, os, true);
ByteBufferUtils.putInt(os, KeyValueUtil.getSerializedSize(mkvA2, true));
KeyValueUtil.oswrite(mkvA2, os, true);
DataInputStream is = new DataInputStream(new ByteArrayInputStream(
byteArrayOutputStream.toByteArray()));
KeyValue deSerKV1 = KeyValueUtil.iscreate(is, true);
assertTrue(kvA1.equals(deSerKV1));
KeyValue deSerKV2 = KeyValueUtil.iscreate(is, true);
assertTrue(kvA2.equals(deSerKV2));
for (KeyValue kv : keyValues) {
DataOutputStream os = new DataOutputStream(byteArrayOutputStream);
ByteBufferUtils.putInt(os, KeyValueUtil.getSerializedSize(kv, true));
KeyValueUtil.oswrite(kv, os, true);
}
DataInputStream is =
new DataInputStream(new ByteArrayInputStream(byteArrayOutputStream.toByteArray()));
for (int i = 0; i < keyValues.length; i++) {
LOG.info("Case#" + i + ": deserialize the kv: " + keyValues[i]);
KeyValue destKv = KeyValueUtil.createKeyValueFromInputStream(is, true);
assertEquals(keyValues[i], destKv);
assertArrayEquals(CellUtil.cloneValue(keyValues[i]), CellUtil.cloneValue(destKv));
assertArrayEquals(PrivateCellUtil.cloneTags(keyValues[i]), PrivateCellUtil.cloneTags(destKv));
}
}
private static class MockKeyValue implements Cell {
private final KeyValue kv;
private static class FailureCase {
byte[] buf;
int offset;
int length;
boolean withTags;
String expectedMessage;
public MockKeyValue(KeyValue kv) {
this.kv = kv;
public FailureCase(byte[] buf, int offset, int length, boolean withTags,
String expectedMessage) {
this.buf = buf;
this.offset = offset;
this.length = length;
this.withTags = withTags;
this.expectedMessage = expectedMessage;
}
/**
* This returns the offset where the tag actually starts.
*/
@Override
public int getTagsOffset() {
return this.kv.getTagsOffset();
public String toString() {
return "FailureCaseDetails: [buf=" + Bytes.toStringBinary(buf, offset, length) + ", offset="
+ offset + ", " + "length=" + length + ", expectedMessage=" + expectedMessage
+ ", withtags=" + withTags + "]";
}
/**
* used to achieve atomic operations in the memstore.
*/
@Override
public long getSequenceId() {
return this.kv.getSequenceId();
public String getExpectedMessage() {
return this.expectedMessage + KeyValueUtil.bytesToHex(buf, offset, length);
}
}
@Test
public void testCheckKeyValueBytesFailureCase() throws Exception {
byte[][] inputs = new byte[][] { HConstants.EMPTY_BYTE_ARRAY, // case.0
Bytes.toBytesBinary("a"), // case.1
Bytes.toBytesBinary("\\x00\\x00\\x00\\x01"), // case.2
Bytes.toBytesBinary("\\x00\\x00\\x00\\x01\\x00"), // case.3
Bytes.toBytesBinary("\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x01"), // case.4
Bytes.toBytesBinary("\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x01\\x00"), // case.5
Bytes.toBytesBinary("\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x01\\x00\\x01"), // case.6
Bytes.toBytesBinary("\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x01\\x00\\x03ROW"), // case.7
Bytes.toBytesBinary("\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01"), // case.8
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\xFF"
+ "\\xFF\\xFF\\xFF\\xFF\\xFF\\xFF\\xFF\\x03"), // case.9
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x03"), // case.10
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04"), // case.11
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04VALUE"), // case.12
};
String[] outputs = new String[] { "Overflow when reading key length at position=0",
"Overflow when reading key length at position=0",
"Invalid key length in KeyValue. keyLength=1",
"Overflow when reading value length at position=4",
"Invalid value length in KeyValue, valueLength=1",
"Overflow when reading row length at position=8",
"Invalid row length in KeyValue, rowLength=1",
"Overflow when reading family length at position=13",
"Invalid family length in KeyValue, familyLength=1", "Timestamp cannot be negative, ts=-1",
"Invalid type in KeyValue, type=3", "Overflow when reading value part at position=25",
"Some redundant bytes in KeyValue's buffer, startOffset=26, endOffset=30", };
byte[][] withTagsInputs = new byte[][] {
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x01"), // case.13
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x00\\x01"), // case.14
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x00\\x04\\x00\\x03\\x00A"), // case.15
// case.16
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x00\\x0A\\x00\\x04\\x00TAG\\x00\\x04"
+ "\\xFFT"),
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x00\\x0C\\x00\\x04\\x00TAG\\x00\\x05"
+ "\\xF0COME\\x00"), // case.17
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x00\\x0C\\x00\\x04\\x00TAG\\x00\\x05"
+ "\\xF0COME"), // case.18
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x00\\x00"), // case.19
Bytes.toBytesBinary("\\x00\\x00\\x00\\x11\\x00\\x00\\x00\\x01\\x00\\x03ROW\\x01FQ\\x00"
+ "\\x00\\x00\\x00\\x00\\x00\\x00\\x01\\x04V\\x00\\x1B\\x00\\x05\\x01TAG1\\x00\\x05"
+ "\\x02TAG2\\x00\\x05\\x03TAG3\\x00\\x05\\x04TAG4"), // case.20
};
String[] withTagsOutputs = new String[] { "Overflow when reading tags length at position=26",
"Invalid tags length in KeyValue at position=26",
"Invalid tag length at position=28, tagLength=3",
"Invalid tag length at position=34, tagLength=4",
"Some redundant bytes in KeyValue's buffer, startOffset=41, endOffset=42", null, null,
null, };
assertEquals(inputs.length, outputs.length);
assertEquals(withTagsInputs.length, withTagsOutputs.length);
FailureCase[] cases = new FailureCase[inputs.length + withTagsInputs.length];
for (int i = 0; i < inputs.length; i++) {
cases[i] = new FailureCase(inputs[i], 0, inputs[i].length, false, outputs[i]);
}
for (int i = 0; i < withTagsInputs.length; i++) {
cases[inputs.length + i] =
new FailureCase(withTagsInputs[i], 0, withTagsInputs[i].length, true, withTagsOutputs[i]);
}
/**
* This returns the total length of the tag bytes
*/
@Override
public int getTagsLength() {
return this.kv.getTagsLength();
}
/**
*
* @return Timestamp
*/
@Override
public long getTimestamp() {
return this.kv.getTimestamp();
}
/**
* @return KeyValue.TYPE byte representation
*/
@Override
public byte getTypeByte() {
return this.kv.getTypeByte();
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are
* in a single array)
*/
@Override
public byte[] getValueArray() {
return this.kv.getValueArray();
}
/**
* @return the value offset
*/
@Override
public int getValueOffset() {
return this.kv.getValueOffset();
}
/**
* @return Value length
*/
@Override
public int getValueLength() {
return this.kv.getValueLength();
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are
* in a single array)
*/
@Override
public byte[] getRowArray() {
return this.kv.getRowArray();
}
/**
* @return Row offset
*/
@Override
public int getRowOffset() {
return this.kv.getRowOffset();
}
/**
* @return Row length
*/
@Override
public short getRowLength() {
return this.kv.getRowLength();
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are
* in a single array)
*/
@Override
public byte[] getFamilyArray() {
return this.kv.getFamilyArray();
}
/**
* @return Family offset
*/
@Override
public int getFamilyOffset() {
return this.kv.getFamilyOffset();
}
/**
* @return Family length
*/
@Override
public byte getFamilyLength() {
return this.kv.getFamilyLength();
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are
* in a single array)
*/
@Override
public byte[] getQualifierArray() {
return this.kv.getQualifierArray();
}
/**
* @return Qualifier offset
*/
@Override
public int getQualifierOffset() {
return this.kv.getQualifierOffset();
}
/**
* @return Qualifier length
*/
@Override
public int getQualifierLength() {
return this.kv.getQualifierLength();
}
/**
* @return the backing array of the entire KeyValue (all KeyValue fields are
* in a single array)
*/
@Override
public byte[] getTagsArray() {
return this.kv.getTagsArray();
for (int i = 0; i < cases.length; i++) {
FailureCase c = cases[i];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream os = new DataOutputStream(baos);
ByteBufferUtils.putInt(os, c.length);
os.write(c.buf, c.offset, c.length);
try {
KeyValueUtil.createKeyValueFromInputStream(
new DataInputStream(new ByteArrayInputStream(baos.toByteArray())), c.withTags);
if (c.expectedMessage != null) {
fail("Should fail when parse key value from an invalid bytes for case#" + i + ". " + c);
}
} catch (IOException e) {
assertEquals("Case#" + i + " failed," + c, c.getExpectedMessage(), e.getMessage());
}
}
}
}

1
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
View File

@ -1710,7 +1710,6 @@ public class HStore implements Store, HeapSize, StoreConfigInformation, Propagat
@Override
public boolean hasReferences() {
List<HStoreFile> reloadedStoreFiles = null;
// Grab the read lock here, because we need to ensure that: only when the atomic
// replaceStoreFiles(..) finished, we can get all the complete store file list.
this.lock.readLock().lock();