Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/WriteScheduler.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 package org.dancres.blitz.entry; |
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2 |
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3 import java.io.IOException; |
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4 |
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5 import java.util.HashMap; |
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6 |
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7 import java.util.logging.Level; |
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8 |
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9 import org.dancres.blitz.oid.OID; |
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10 import org.dancres.blitz.entry.ci.CacheIndexer; |
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11 |
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12 /** |
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13 <p> Transactional writes add a further complication to the caching process |
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14 because, whilst they can be flushed from SleeveCache, they can't necessarily |
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15 be written to disk. Consider the case where a transaction starts and |
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16 writes an entry, other activity causes that entry to be flushed from |
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17 SleeveCache into the asynchronous write queue and then saved to disk. |
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18 The system now crashes prior to the original writing transaction issuing |
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19 a successful prepare. At recovery, we will have an additional entry on |
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20 disk unprotected by transactional locks and it would be valid for matching. |
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21 </p> |
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22 |
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23 <p> WriteScheduler helps solve this problem by supporting "Transient" |
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24 EntrySleeveImpls. EntrySleeveImpls marked as transient are held in |
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25 WriteScheduler but not schedule to be written to disk. WriteScheduler |
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26 maintains an index of all Entry's to assist in searching so these |
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27 Transient's are available for matching. When a transaction commits, the |
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28 Transient mark is removed from EntrySleeveImpls (these sleeves must be |
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29 reloaded into SleeveCache for this to happen) and they are re-submitted to |
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30 WriteScheduler at which point they are scheduled for writing. </p> |
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31 |
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32 <p> Thus, until a transaction is commited/aborted, any EntrySleeveImpls |
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33 written are marked Transient. During commit/abort, these Sleeves have the |
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34 mark removed and are thus eligible for writing to disk. </p> |
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35 */ |
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36 class WriteScheduler { |
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37 private HashMap theTransients = new HashMap(); |
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38 |
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39 private WriteBuffer theBuffer; |
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40 private String theType; |
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41 |
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42 WriteScheduler(EntryEditor anEditor) { |
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43 theType = anEditor.getType(); |
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44 theBuffer = new WriteBuffer(anEditor); |
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45 } |
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46 |
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47 public int getSize() { |
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48 throw new org.dancres.util.NotImplementedException(); |
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49 } |
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50 |
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51 void add(EntrySleeveImpl aSleeve) throws IOException { |
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52 /* |
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53 Cache has no concept of dirty, it flushes content out of a block |
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54 whenever it wishes to use the block for something else. So, |
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55 it's possible we'll be asked to flush an empty block. |
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56 */ |
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57 if (aSleeve == null) |
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58 return; |
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59 |
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60 /* |
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61 Whether the sleeve is dirty or not, if it's pinned we remember it. |
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62 Pinned implies some entity will do more with this sleeve later |
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63 including potentially dirtying state which might be clean at |
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64 this stage. Thus we must remember the state clean or dirty until |
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65 the pin is released. |
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66 */ |
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67 SleeveState myState = aSleeve.getState(); |
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68 |
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69 if (myState.test(SleeveState.PINNED)) { |
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70 synchronized(theTransients) { |
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71 theTransients.put(aSleeve.getOID(), aSleeve); |
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72 } |
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73 |
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74 return; |
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75 } |
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76 |
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77 /* |
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78 Cache flushed the entry - do we need to save it? |
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79 */ |
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80 if (!aSleeve.isDirty()) |
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81 return; |
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82 |
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83 boolean dontWrite = myState.test(SleeveState.NOT_ON_DISK) && |
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84 myState.test(SleeveState.DELETED); |
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85 |
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86 /* |
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87 If we're not writing this entry, clear it from the indexer now |
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88 otherwise leave it to the write buffer to do when it's pushed |
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89 the entry to disk |
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90 if (dontWrite) { |
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91 CacheIndexer.getIndexer(theType).flushed(aSleeve); |
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92 } |
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93 */ |
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94 |
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95 synchronized(theTransients) { |
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96 theTransients.remove(aSleeve.getOID()); |
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97 |
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98 if (!dontWrite) |
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99 theBuffer.add(aSleeve); |
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100 } |
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101 |
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102 /* |
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103 Note we do not manage NOT_ON_DISK - this is dealt with in the |
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104 WriteBuffer as it's vital state it needs to determine whether or |
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105 not to actually update disk. |
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106 */ |
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107 aSleeve.clearDirty(); |
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108 } |
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109 |
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110 EntrySleeveImpl dirtyRead(OID aUID) { |
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111 EntrySleeveImpl mySleeve = null; |
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112 |
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113 synchronized(theTransients) { |
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114 mySleeve = (EntrySleeveImpl) theTransients.get(aUID); |
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115 } |
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116 |
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117 if (mySleeve == null) |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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118 mySleeve = theBuffer.dirtyRead(aUID); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
119 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
120 return mySleeve; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
121 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
122 } |